Objective:To explore the application effect of flipped classroom combined with case-based learning teaching methods in pharmacoeconomics teaching.Methods:The students majoring in clinical pharmacy in 2019 were selecte...Objective:To explore the application effect of flipped classroom combined with case-based learning teaching methods in pharmacoeconomics teaching.Methods:The students majoring in clinical pharmacy in 2019 were selected as the study subjects,and the cost-effectiveness analysis of different dosage forms of Yinzhihuang in the treatment of neonatal jaundice was selected as the teaching case.The flipped classroom combined with case-based learning teaching method was used to carry out theoretical teaching to the students.After the course,questionnaires were distributed through the Sojump platform to evaluate the teaching effect.Results:The results of the questionnaire showed that 85.71%of the students believed that the flipped classroom combined with case-based learning teaching method was helpful in mobilizing the learning enthusiasm and initiative,and improving the comprehensive application ability of the knowledge of pharmacoeconomics.92.86%of the students think that it is conducive to the understanding and memorization of learning content,as well as the cultivation of teamwork,communication,etc.Conclusion:Flipped classroom combined with case-based learning teaching method can improve students’knowledge mastery,thinking skills,and practical application skills,as well as optimize and improve teachers’teaching levels.展开更多
An enhanced ARTSIST Sea Ice(ASI)algorithm is presented based on a data fusion method of calculating total sea ice concentration from high-frequency microwave data.Algorithms that use low-frequency data to calculate to...An enhanced ARTSIST Sea Ice(ASI)algorithm is presented based on a data fusion method of calculating total sea ice concentration from high-frequency microwave data.Algorithms that use low-frequency data to calculate total sea ice concentration are less affected by atmosphere,but their spatial resolutions tend to be lower.In contrast,algorithms using high-frequency data have higher spatial resolution but are significantly influenced by atmosphere.Although errors can be eliminated using weather filters,the concentration of mixed pixels cannot be modified.Here,an enhanced ASI algorithm uses the 19 GHz polarization difference to modify the 91 GHz polarization difference,which is substituted into the ASI algorithm to calculate total sea ice concentration.Arctic total sea ice concentration results are obtained based on Special Sensor Microwave Imager Sounder(SSMIS)data on January 3,from 2008 to 2017.Total sea ice area and average concentration using the enhanced ASI algorithm are compared to traditional ASI and NASA Team results.In the Marginal Ice Zone,there is a considerable difference between the enhanced and traditional ASI algorithm results,with the former much closer to the NASA Team results.The proposed algorithm effectively modifies the concentration of the mixed pixels in the marginal zone.展开更多
Cells are the basic unit of life structure and life activities.Because of the complex micro-environment of cells,the content of components that play a key role is relatively small,so single-cell analysis is extremely ...Cells are the basic unit of life structure and life activities.Because of the complex micro-environment of cells,the content of components that play a key role is relatively small,so single-cell analysis is extremely challenging.In recent years,single-cell sequencing technology has been developed and matured.Single-cell sequencing can reveal the composition and physiological diversity of cells,and the existing single-cell separation technology,single-cell whole genome amplification technology,single The principles and applications of cell whole transcriptome amplification technology and single cell transcriptome sequencing are summarized and summarized.展开更多
The clinical efficacy of current cancer therapies falls short,and there is a pressing demand to integrate new targets with conventional therapies.Autophagy,a highly conserved self-degradation process,has received cons...The clinical efficacy of current cancer therapies falls short,and there is a pressing demand to integrate new targets with conventional therapies.Autophagy,a highly conserved self-degradation process,has received considerable attention as an emerging therapeutic target for cancer.With the rapid development of nanomedicine,nanomaterials have been widely utilized in cancer therapy due to their unrivaled delivery performance.Hence,considering the potential benefits of integrating autophagy and nanotechnology in cancer therapy,we outline the latest advances in autophagy-based nanotherapeutics.Based on a brief background related to autophagy and nanotherapeutics and their impact on tumor progression,the feasibility of autophagy-based nanotherapeutics for cancer treatment is demonstrated.Further,emerging nanotherapeutics developed to modulate autophagy are reviewed from the perspective of cell signaling pathways,including modulation of the mammalian target of rapamycin(mTOR)pathway,autophagy-related(ATG)and its complex expression,reactive oxygen species(ROS)and mitophagy,interference with autophagosome-lysosome fusion,and inhibition of hypoxia-mediated autophagy.In addition,combination therapies in which nano-autophagy modulation is combined with chemotherapy,phototherapy,and immunotherapy are also described.Finally,the prospects and challenges of autophagy-based nanotherapeutics for efficient cancer treatment are envisioned.展开更多
Tannery sludge with high chromium content has been identified as hazardous solid waste due to its potential toxic effects.The safety disposal and valorization of the tannery sludge remains a challenge.In this study,th...Tannery sludge with high chromium content has been identified as hazardous solid waste due to its potential toxic effects.The safety disposal and valorization of the tannery sludge remains a challenge.In this study,the chromium stabilization mechanism was systematically investigated during chromium-rich tannery sludge was converted to biochar and the removal performance of the sludge biochar(SBC)for Cr(Ⅵ)from tannery wastewater was also investigated.The results showed that increase in pyrolysis temperature was conductive to the stabilization of Cr and significant reduction of the proportion of Cr(Ⅵ)in SBC.It was confirmed that the stabilization of chromium mainly was attributed to the embedding of chromium in the C matrix and the transformation of the chromium-containing substances from the amorphous Cr(OH)_(3)to the crystalline state,such as(FeMg)Cr_(2)O_(5).The biochar presented high adsorption capacity of Cr(Ⅵ)at low pH and the maximal theoretical adsorption capacity of SBC produced at 800°C can reach 352 mg Cr(Ⅵ)/g,the process of which can be well expressed by Langmuir adsorption isotherm and pseudo second order model.The electrostatic effect and reduction reaction were dominantly responsible for the Cr(Ⅵ)adsorption by SBC800.Overall,this study provided a novel strategy for the harmless disposal and resource utilization for the solid waste containing chromium in leather industry.展开更多
Electrochemical coupling hydrogen evolution with biomass reforming reaction(named electrochemical hydrogen and chemical cogeneration(EHCC)),which realizes green hydrogen production and chemical upgrading simultaneousl...Electrochemical coupling hydrogen evolution with biomass reforming reaction(named electrochemical hydrogen and chemical cogeneration(EHCC)),which realizes green hydrogen production and chemical upgrading simultaneously,is a promising method to build a carbon-neutral society.Herein,we analyze the EHCC process by considering the market assessment.The ethanol to acetic acid and hydrogen approach is the most feasible for large-scale hydrogen production.We develop AuCu nanocatalysts,which can selectively oxidize ethanol to acetic acid(>97%)with high long-term activity.The isotopic and in-situ infrared experiments reveal that the promoted water dissociation step by alloying contributes to the enhanced activity of the partial oxidation reaction path.A flow-cell electrolyzer equipped with the AuCu anodic catalyst achieves the steady production of hydrogen and acetic acid simultaneously in both high selectivity(>90%),demonstrating the potential scalable application for green hydrogen production with low energy consumption and high profitability.展开更多
The microstructures of the ionomer–catalyst interfaces in the catalyst layers are important for the fuel cell performance because they determine the distribution of the active triple-phase boundaries.Here,we investig...The microstructures of the ionomer–catalyst interfaces in the catalyst layers are important for the fuel cell performance because they determine the distribution of the active triple-phase boundaries.Here,we investigate the ionomer–catalyst interactions in hydroxide exchange membrane fuel cells(HEMFCs)using poly(aryl piperidinium)and compare them with proton exchange membrane fuel cells(PEMFCs).It is found that different catalyst layer microstructures are between the two types of fuel cell.The ionomer/carbon(I/C)ratio does not have a remarkable impact on the HEMFC performance,while it has a strong impact on the PEMFC performance,indicating the weaker interaction between the HEMFC ionomer and catalyst.Molecular dynamics simulations demonstrate that the HEMFC ionomer tends to distribute on the carbon support,unlike the PEMFC ionomer,which heavily covers the Pt nanoparticles.These results suggest that the poisoning effect of the ionomer on the catalyst is much weaker in HEMFCs,and the improved ionomer/catalyst interaction is beneficial for the HEMFC performances.展开更多
Doped phosphide is promising in earthabundant element based catalysts for hydrogen evolution reaction(HER). Here we employ ammonium hypophosphite(NH4H2PO2) to synthesize a novel parallel doped catalyst,nitrogen doped ...Doped phosphide is promising in earthabundant element based catalysts for hydrogen evolution reaction(HER). Here we employ ammonium hypophosphite(NH4H2PO2) to synthesize a novel parallel doped catalyst,nitrogen doped molybdenum phosphide nanoparticles(NPs)supported on nitrogen doped carbon nanotubes(N-MoP/N-CNTs). The NH4H2PO2 as a bifunctional agent severs as both phosphidation agent and nitrogen source, which makes the synthetic route simple and efficient. The as-obtained parallel doped N-MoP/N-CNTs show an overpotential of 103±5 mV at 10 mA cm-2, which is 140 mV lower than that of MoP NPs. The enhanced HER performance is attributed to the electronic effect by doped MoP and CNTs supports. This work provides a facile route to synthesize doped phosphides for the potential applications in hydrogen energy.展开更多
It is urgent to develop low-cost but efficient oxygen reduction reaction(ORR)catalysts for the emerging clean energy devices of fuel cells based on proton exchange membrane.Herein,we report a facile method to covert t...It is urgent to develop low-cost but efficient oxygen reduction reaction(ORR)catalysts for the emerging clean energy devices of fuel cells based on proton exchange membrane.Herein,we report a facile method to covert the biomass of black fungus into an efficient ORR catalyst.The black fungus undergoes hydrothermal and pyrolysis processes to transform into carbon-based materials.The as-obtained BF-N-950 catalyst shows prominent ORR catalytic activities in both acidic and alkaline electrolytes with a half-wave potential reaching 0.77 and 0.91 V,respectively.A membrane electrolyte assembly was fabricated with the as-obtained BF-N-950 as the cathode catalyst which shows a high peak power density of255 mW cm^-2.The study shows the potential of converting conventional biomass into low-cost ORR catalyst,which is promising for the fuel cell technology.展开更多
Ag is a potential low-cost oxygen reduction reaction(ORR)catalyst in alkaline condition,which is important for the zinc-air batteries.Here,we report that an Ag based single atom catalyst with heteroatom coordination.A...Ag is a potential low-cost oxygen reduction reaction(ORR)catalyst in alkaline condition,which is important for the zinc-air batteries.Here,we report that an Ag based single atom catalyst with heteroatom coordination.Ag1-h-NPClSC,has been synthesized and shown much improved performance towards ORR by manipulating the coordination environment of the Ag center.It shows a high half wave potential(0.896 V)and a high turnover frequency(TOF)(5.9 s^(−1))at 0.85 V,which are higher than the previously reported Ag based catalysts and commercial Pt/C.A zinc-air battery with high peak power density of 270 mW·cm^(−2)is fabricated by using the Ag1-h-NPClSC as air electrode.The high performance is attributed to(1)the hollow structure providing good mass transfer;(2)the single atom metal center structure providing high utility of the Ag;(3)heteroatom coordination environment providing the adjusted binding to the ORR intermediates.Density functional theory(DFT)calculations show that the energy barrier for the formation of OOH*,which is considered as the rate determine step for ORR on Ag nanoparticles,is lowered on Ag1-h-NPClSC,thus improving the ORR activity.This work demonstrates that the well manipulated Ag based single atom catalysts are promising in electrocatalysis.展开更多
Three kinds of through-space charge transfer(TSCT)blue polymers containing non-conjugated polystyrene backbone together with spatially-separated acridan donor and oxygen-bridged triphenylboron acceptors having differe...Three kinds of through-space charge transfer(TSCT)blue polymers containing non-conjugated polystyrene backbone together with spatially-separated acridan donor and oxygen-bridged triphenylboron acceptors having different substituents of tert-butyl,hydrogen and fluorine are designed and synthesized.The designed TSCT blue polymers possess photoluminescence quantum yields up to 70%in solid-state film,single-triplet energy splitting below 0.1 eV,and typical thermally activated delayed fluorescence(TADF)effect.Meanwhile,the resulting polymers exhibit aggregation-induced emission(AIE)effect with emission intensity increased by up to^27 folds from solution to aggregation state.By changing the substituent of acceptors to tune the charge transfer strength,blue emission with peaks from 444 to 480 nm can be realized for the resulting polymers.Solution-processed organic light-emitting diodes based on the polymers exhibit excellent device performance with Commission Internationale de L’Eclairage(CIE)coordinates of(0.16,0.27),together with the maximum luminous efficiency of 30.7 cd A-1 and maximum external quantum efficiency of 15.0%,which is the best device efficiency for blue TADF polymers.展开更多
Boron(B)-and sulfur(S)-doped polycyclic aromatic hydrocarbons(PAHs)are developed as a novel kind of multiple resonance emitters for ultrapure blue thermally activated delayed fluorescence(TADF)polymers with narrowband...Boron(B)-and sulfur(S)-doped polycyclic aromatic hydrocarbons(PAHs)are developed as a novel kind of multiple resonance emitters for ultrapure blue thermally activated delayed fluorescence(TADF)polymers with narrowband electroluminescence.The combination of electron-deficient B atom and electron-rich S atom in PAH can form an intramolecular push-pull electronic system in a rigid aromatic framework,leading to reduced singlet-triplet energy splitting and limited structure relaxation of excited states.The critical roles of S atom in determining emission properties with respect to the oxygen analogues are in two aspects:(i)reducing energy bandgap to shift emission from human-eye-insensitive ultraviolet zone to blue region,and(ii)promoting reverse intersystem crossing process by heavy-atom effect to activate TADF effect.The resulting polymer containing B,S-doped PAH as emitter and acridan as host exhibits efficient blue electroluminescence at 458 nm with small full-width at halfmaximum of 31 nm,representing the first example for ultrapure TADF polymer with narrowband electroluminescence.展开更多
Two novel boron(B),sulfur(S),nitrogen(N)-doped polycyclic aromatic hydrocarbon multiple resonance emitters(DBNS and DBNS-tBu)are designed and synthesized for narrowband red emission by embedding two pairs of S and N a...Two novel boron(B),sulfur(S),nitrogen(N)-doped polycyclic aromatic hydrocarbon multiple resonance emitters(DBNS and DBNS-tBu)are designed and synthesized for narrowband red emission by embedding two pairs of S and N atoms and two B atoms in para-positions of central benzene rings within a tridecacyclic aromatic skeleton to form donor-π-donor(D-π-D)and acceptor-π-acceptor(A-π-A)structures,which not only exhibit emission maximum at 641 nm with small full width at half maximum of 39 nm,but also combine high photoluminescent quantum efficiency(85%)and rapid reverse intersystem crossing(kRISC=2.2×10^(5) s^(−1)).展开更多
Insulin-like growth factor 1(IGF-1) is a pluripotent growth factor,with multiple functions in the peripheral and central nervous systems. Increasing evidence suggests that IGF-1 fine-tunes the development of the centr...Insulin-like growth factor 1(IGF-1) is a pluripotent growth factor,with multiple functions in the peripheral and central nervous systems. Increasing evidence suggests that IGF-1 fine-tunes the development of the central nervous system,ensuring proper neuronal differentiation,maturation,and connectivity. It supports neuronal survival and axon growth,and acts on myelinating Schwann cells and oligodendroglia. The biological functions of IGF-1 are modulated by the IGF-1 signaling pathway. Recent studies have proposed the modulation of the members of the IGF-1/IGF-1 signaling pathway as treatment for neuropathologies. In this study,we introduce the structure of IGF-1/2 and its receptors,with the intra-cellular interactions. Further,we review the therapeutic effects of IGF-1 in different models of brain diseases,via activation of different cellular mechanisms.展开更多
基金2022 Medical Innovation and Development Project of Lanzhou University(lzuyxcx-2022-40)2022 Education and Teaching Reform Research Project of Lanzhou University General Project(202201)The Foundation of the First Hospital of Lanzhou University(ldyyyn 2021-92)。
文摘Objective:To explore the application effect of flipped classroom combined with case-based learning teaching methods in pharmacoeconomics teaching.Methods:The students majoring in clinical pharmacy in 2019 were selected as the study subjects,and the cost-effectiveness analysis of different dosage forms of Yinzhihuang in the treatment of neonatal jaundice was selected as the teaching case.The flipped classroom combined with case-based learning teaching method was used to carry out theoretical teaching to the students.After the course,questionnaires were distributed through the Sojump platform to evaluate the teaching effect.Results:The results of the questionnaire showed that 85.71%of the students believed that the flipped classroom combined with case-based learning teaching method was helpful in mobilizing the learning enthusiasm and initiative,and improving the comprehensive application ability of the knowledge of pharmacoeconomics.92.86%of the students think that it is conducive to the understanding and memorization of learning content,as well as the cultivation of teamwork,communication,etc.Conclusion:Flipped classroom combined with case-based learning teaching method can improve students’knowledge mastery,thinking skills,and practical application skills,as well as optimize and improve teachers’teaching levels.
基金The National Natural Science Foundation of China under contract No.41606209the Open Fund from Key Laboratory of Global Change and Marine-Atmospheric Chemistry under contract No.GCMAC1605+1 种基金the Natural Science Project of Henan Education Department under contract No.15A120007the Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,Chinese Academy of Sciences under contract No.KLOCW1805
文摘An enhanced ARTSIST Sea Ice(ASI)algorithm is presented based on a data fusion method of calculating total sea ice concentration from high-frequency microwave data.Algorithms that use low-frequency data to calculate total sea ice concentration are less affected by atmosphere,but their spatial resolutions tend to be lower.In contrast,algorithms using high-frequency data have higher spatial resolution but are significantly influenced by atmosphere.Although errors can be eliminated using weather filters,the concentration of mixed pixels cannot be modified.Here,an enhanced ASI algorithm uses the 19 GHz polarization difference to modify the 91 GHz polarization difference,which is substituted into the ASI algorithm to calculate total sea ice concentration.Arctic total sea ice concentration results are obtained based on Special Sensor Microwave Imager Sounder(SSMIS)data on January 3,from 2008 to 2017.Total sea ice area and average concentration using the enhanced ASI algorithm are compared to traditional ASI and NASA Team results.In the Marginal Ice Zone,there is a considerable difference between the enhanced and traditional ASI algorithm results,with the former much closer to the NASA Team results.The proposed algorithm effectively modifies the concentration of the mixed pixels in the marginal zone.
文摘Cells are the basic unit of life structure and life activities.Because of the complex micro-environment of cells,the content of components that play a key role is relatively small,so single-cell analysis is extremely challenging.In recent years,single-cell sequencing technology has been developed and matured.Single-cell sequencing can reveal the composition and physiological diversity of cells,and the existing single-cell separation technology,single-cell whole genome amplification technology,single The principles and applications of cell whole transcriptome amplification technology and single cell transcriptome sequencing are summarized and summarized.
基金the National Natural Science Foundation of China(No.81971729)for financial support.
文摘The clinical efficacy of current cancer therapies falls short,and there is a pressing demand to integrate new targets with conventional therapies.Autophagy,a highly conserved self-degradation process,has received considerable attention as an emerging therapeutic target for cancer.With the rapid development of nanomedicine,nanomaterials have been widely utilized in cancer therapy due to their unrivaled delivery performance.Hence,considering the potential benefits of integrating autophagy and nanotechnology in cancer therapy,we outline the latest advances in autophagy-based nanotherapeutics.Based on a brief background related to autophagy and nanotherapeutics and their impact on tumor progression,the feasibility of autophagy-based nanotherapeutics for cancer treatment is demonstrated.Further,emerging nanotherapeutics developed to modulate autophagy are reviewed from the perspective of cell signaling pathways,including modulation of the mammalian target of rapamycin(mTOR)pathway,autophagy-related(ATG)and its complex expression,reactive oxygen species(ROS)and mitophagy,interference with autophagosome-lysosome fusion,and inhibition of hypoxia-mediated autophagy.In addition,combination therapies in which nano-autophagy modulation is combined with chemotherapy,phototherapy,and immunotherapy are also described.Finally,the prospects and challenges of autophagy-based nanotherapeutics for efficient cancer treatment are envisioned.
基金supported by the Alliance of International Science Organizations(No.ANSO-CR-KP-2021-08)the STS Plan Supporting Project of the Chinese Academy of Sciences in Fujian Province(Nos.2020T3036,2021T3102,2021T3073,2021T3049,and 2022T3065)+1 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA23030301)the Social Development Leading Key Projects of Fujian Province(No.2022Y0080)。
文摘Tannery sludge with high chromium content has been identified as hazardous solid waste due to its potential toxic effects.The safety disposal and valorization of the tannery sludge remains a challenge.In this study,the chromium stabilization mechanism was systematically investigated during chromium-rich tannery sludge was converted to biochar and the removal performance of the sludge biochar(SBC)for Cr(Ⅵ)from tannery wastewater was also investigated.The results showed that increase in pyrolysis temperature was conductive to the stabilization of Cr and significant reduction of the proportion of Cr(Ⅵ)in SBC.It was confirmed that the stabilization of chromium mainly was attributed to the embedding of chromium in the C matrix and the transformation of the chromium-containing substances from the amorphous Cr(OH)_(3)to the crystalline state,such as(FeMg)Cr_(2)O_(5).The biochar presented high adsorption capacity of Cr(Ⅵ)at low pH and the maximal theoretical adsorption capacity of SBC produced at 800°C can reach 352 mg Cr(Ⅵ)/g,the process of which can be well expressed by Langmuir adsorption isotherm and pseudo second order model.The electrostatic effect and reduction reaction were dominantly responsible for the Cr(Ⅵ)adsorption by SBC800.Overall,this study provided a novel strategy for the harmless disposal and resource utilization for the solid waste containing chromium in leather industry.
基金supported by the National Natural Science Foundation of China(Nos.21971008 and 22279004)Beijing Natural Science Foundation(No.Z210016)Fundamental Research Funds for the Central Universities(No.buctrc201916).
文摘Electrochemical coupling hydrogen evolution with biomass reforming reaction(named electrochemical hydrogen and chemical cogeneration(EHCC)),which realizes green hydrogen production and chemical upgrading simultaneously,is a promising method to build a carbon-neutral society.Herein,we analyze the EHCC process by considering the market assessment.The ethanol to acetic acid and hydrogen approach is the most feasible for large-scale hydrogen production.We develop AuCu nanocatalysts,which can selectively oxidize ethanol to acetic acid(>97%)with high long-term activity.The isotopic and in-situ infrared experiments reveal that the promoted water dissociation step by alloying contributes to the enhanced activity of the partial oxidation reaction path.A flow-cell electrolyzer equipped with the AuCu anodic catalyst achieves the steady production of hydrogen and acetic acid simultaneously in both high selectivity(>90%),demonstrating the potential scalable application for green hydrogen production with low energy consumption and high profitability.
基金financially supported by Beijing Natural Science Foundation(No.Z210016).
文摘The microstructures of the ionomer–catalyst interfaces in the catalyst layers are important for the fuel cell performance because they determine the distribution of the active triple-phase boundaries.Here,we investigate the ionomer–catalyst interactions in hydroxide exchange membrane fuel cells(HEMFCs)using poly(aryl piperidinium)and compare them with proton exchange membrane fuel cells(PEMFCs).It is found that different catalyst layer microstructures are between the two types of fuel cell.The ionomer/carbon(I/C)ratio does not have a remarkable impact on the HEMFC performance,while it has a strong impact on the PEMFC performance,indicating the weaker interaction between the HEMFC ionomer and catalyst.Molecular dynamics simulations demonstrate that the HEMFC ionomer tends to distribute on the carbon support,unlike the PEMFC ionomer,which heavily covers the Pt nanoparticles.These results suggest that the poisoning effect of the ionomer on the catalyst is much weaker in HEMFCs,and the improved ionomer/catalyst interaction is beneficial for the HEMFC performances.
基金supported by the National Key Research and Development Program of China (2017YFA0206500)the National Natural Science Foundation of China (21671014)the Fundamental Research Funds for the Central Universities (buctrc201522)
文摘Doped phosphide is promising in earthabundant element based catalysts for hydrogen evolution reaction(HER). Here we employ ammonium hypophosphite(NH4H2PO2) to synthesize a novel parallel doped catalyst,nitrogen doped molybdenum phosphide nanoparticles(NPs)supported on nitrogen doped carbon nanotubes(N-MoP/N-CNTs). The NH4H2PO2 as a bifunctional agent severs as both phosphidation agent and nitrogen source, which makes the synthetic route simple and efficient. The as-obtained parallel doped N-MoP/N-CNTs show an overpotential of 103±5 mV at 10 mA cm-2, which is 140 mV lower than that of MoP NPs. The enhanced HER performance is attributed to the electronic effect by doped MoP and CNTs supports. This work provides a facile route to synthesize doped phosphides for the potential applications in hydrogen energy.
基金financially supported by the National Key Research and Development Program of China (2017YFA0206500)the National Natural Science Foundation of China (21671014)the Fundamental Research Funds for the Central Universities (buctrc201823)
文摘It is urgent to develop low-cost but efficient oxygen reduction reaction(ORR)catalysts for the emerging clean energy devices of fuel cells based on proton exchange membrane.Herein,we report a facile method to covert the biomass of black fungus into an efficient ORR catalyst.The black fungus undergoes hydrothermal and pyrolysis processes to transform into carbon-based materials.The as-obtained BF-N-950 catalyst shows prominent ORR catalytic activities in both acidic and alkaline electrolytes with a half-wave potential reaching 0.77 and 0.91 V,respectively.A membrane electrolyte assembly was fabricated with the as-obtained BF-N-950 as the cathode catalyst which shows a high peak power density of255 mW cm^-2.The study shows the potential of converting conventional biomass into low-cost ORR catalyst,which is promising for the fuel cell technology.
基金the National Key Research and Development Program of China(No.2019YFA0210300)the National Natural Science Foundation of China(No.21971008)Fundamental Research Funds for the Central Universities(Nos.buctrc201916 and buctrc201823).
文摘Ag is a potential low-cost oxygen reduction reaction(ORR)catalyst in alkaline condition,which is important for the zinc-air batteries.Here,we report that an Ag based single atom catalyst with heteroatom coordination.Ag1-h-NPClSC,has been synthesized and shown much improved performance towards ORR by manipulating the coordination environment of the Ag center.It shows a high half wave potential(0.896 V)and a high turnover frequency(TOF)(5.9 s^(−1))at 0.85 V,which are higher than the previously reported Ag based catalysts and commercial Pt/C.A zinc-air battery with high peak power density of 270 mW·cm^(−2)is fabricated by using the Ag1-h-NPClSC as air electrode.The high performance is attributed to(1)the hollow structure providing good mass transfer;(2)the single atom metal center structure providing high utility of the Ag;(3)heteroatom coordination environment providing the adjusted binding to the ORR intermediates.Density functional theory(DFT)calculations show that the energy barrier for the formation of OOH*,which is considered as the rate determine step for ORR on Ag nanoparticles,is lowered on Ag1-h-NPClSC,thus improving the ORR activity.This work demonstrates that the well manipulated Ag based single atom catalysts are promising in electrocatalysis.
基金supported by the National Natural Science Foundation of China(51833009,21975247,51573182)the National Program on Key Basic Research Project of China(2015CB655000)the Youth Innovation Promotion Association of Chinese Academy of Sciences(2015180)。
文摘Three kinds of through-space charge transfer(TSCT)blue polymers containing non-conjugated polystyrene backbone together with spatially-separated acridan donor and oxygen-bridged triphenylboron acceptors having different substituents of tert-butyl,hydrogen and fluorine are designed and synthesized.The designed TSCT blue polymers possess photoluminescence quantum yields up to 70%in solid-state film,single-triplet energy splitting below 0.1 eV,and typical thermally activated delayed fluorescence(TADF)effect.Meanwhile,the resulting polymers exhibit aggregation-induced emission(AIE)effect with emission intensity increased by up to^27 folds from solution to aggregation state.By changing the substituent of acceptors to tune the charge transfer strength,blue emission with peaks from 444 to 480 nm can be realized for the resulting polymers.Solution-processed organic light-emitting diodes based on the polymers exhibit excellent device performance with Commission Internationale de L’Eclairage(CIE)coordinates of(0.16,0.27),together with the maximum luminous efficiency of 30.7 cd A-1 and maximum external quantum efficiency of 15.0%,which is the best device efficiency for blue TADF polymers.
基金supported by the National Natural Science Foundation of China(52073282,51833009,21975247)the National Basic Research Program of China(2015CB655000)the Youth Innovation Promotion Association of Chinese Academy of Sciences(2015180)。
文摘Boron(B)-and sulfur(S)-doped polycyclic aromatic hydrocarbons(PAHs)are developed as a novel kind of multiple resonance emitters for ultrapure blue thermally activated delayed fluorescence(TADF)polymers with narrowband electroluminescence.The combination of electron-deficient B atom and electron-rich S atom in PAH can form an intramolecular push-pull electronic system in a rigid aromatic framework,leading to reduced singlet-triplet energy splitting and limited structure relaxation of excited states.The critical roles of S atom in determining emission properties with respect to the oxygen analogues are in two aspects:(i)reducing energy bandgap to shift emission from human-eye-insensitive ultraviolet zone to blue region,and(ii)promoting reverse intersystem crossing process by heavy-atom effect to activate TADF effect.The resulting polymer containing B,S-doped PAH as emitter and acridan as host exhibits efficient blue electroluminescence at 458 nm with small full-width at halfmaximum of 31 nm,representing the first example for ultrapure TADF polymer with narrowband electroluminescence.
基金support from the National Natural Science Foundation of China(Nos.52122309,52073282,21975247 and 51833009)the Open Project of State Key Laboratoryof SupramolecularStructureandMaterials(sklssm2022016)the Youth Innovation Promotion Association of Chinese Academyof Sciences(No.2015180).
文摘Two novel boron(B),sulfur(S),nitrogen(N)-doped polycyclic aromatic hydrocarbon multiple resonance emitters(DBNS and DBNS-tBu)are designed and synthesized for narrowband red emission by embedding two pairs of S and N atoms and two B atoms in para-positions of central benzene rings within a tridecacyclic aromatic skeleton to form donor-π-donor(D-π-D)and acceptor-π-acceptor(A-π-A)structures,which not only exhibit emission maximum at 641 nm with small full width at half maximum of 39 nm,but also combine high photoluminescent quantum efficiency(85%)and rapid reverse intersystem crossing(kRISC=2.2×10^(5) s^(−1)).
基金2013 Project of six peak talents in Jiangsu Province,Project number: WSN-022 2017 Project of Northern Jiangsu People’s Hospital,Project number: yzucms201712Standard Diagnosis and Treatment Project of scientific technology and social development in Yangzhou. Project number: YZ2015046
文摘Insulin-like growth factor 1(IGF-1) is a pluripotent growth factor,with multiple functions in the peripheral and central nervous systems. Increasing evidence suggests that IGF-1 fine-tunes the development of the central nervous system,ensuring proper neuronal differentiation,maturation,and connectivity. It supports neuronal survival and axon growth,and acts on myelinating Schwann cells and oligodendroglia. The biological functions of IGF-1 are modulated by the IGF-1 signaling pathway. Recent studies have proposed the modulation of the members of the IGF-1/IGF-1 signaling pathway as treatment for neuropathologies. In this study,we introduce the structure of IGF-1/2 and its receptors,with the intra-cellular interactions. Further,we review the therapeutic effects of IGF-1 in different models of brain diseases,via activation of different cellular mechanisms.
