Nano-sized γ-alumina (γ-Al2O3) was first prepared by a precipitation method. Then, active component of cobalt and a series of alkaline- earth metal promoters or nickel (Ni) with different contents were loaded on the...Nano-sized γ-alumina (γ-Al2O3) was first prepared by a precipitation method. Then, active component of cobalt and a series of alkaline- earth metal promoters or nickel (Ni) with different contents were loaded on the γ-Al2O3 support. The catalysts were characterized by N2 adsorption-desorption, X-ray diffraction (XRD) and thermogravimetry analysis (TGA). The activity and selectivity of the catalysts in catalytic partial oxidation (CPO) of methane have been compared with Co/γ-Al2O3, and it is found that the catalytic activity, selectivity, and stability are enhanced by the addition of alkaline-earth metals and nickel. The optimal loadings of strontium (Sr) and Ni were 6 and 4 wt%, respectively. This finding will be helpful in designing the trimetallic Co-Ni-Sr/γ-Al2O3 catalysts with high performance in CPO of methane.展开更多
An increasing amount of evidence demonstrates the anti-aging effect of Heshouwu in pill form. In this study, a subacute aging rat model was established by continuous intraperitoneal injection of D-galactose and treate...An increasing amount of evidence demonstrates the anti-aging effect of Heshouwu in pill form. In this study, a subacute aging rat model was established by continuous intraperitoneal injection of D-galactose and treated with Heshouwu decoction (a Chinese herb for tonifying the kidney, comprising Heshouwu pill, Herba Epimedii, Radix Salviae Miltiorrhiae, and Poria). Heshouwu pill treated rats were the positive control group. Radioimmunoassay, immunohistochemical staining, and western blot assay showed hypothalamic gonadotropin-releasing hormone, hypothalamic substance P, and serum gonadotropin levels to be significantly increased in the model rats; the concentrations of hypothalamic β-endorphin, and serum levels of insulin-like growth factor 1 and testosterone were significantly decreased. 17β- and 3β-hydroxysteroid dehydrogenase expression in testicular tissue was also decreased. Intragastric administration of Heshouwu decoction at high (9.6 g/mL/100 g), medium (4.8 g/mL/100 g), and low (2.4 g/mL/100 g) doses, Heshouwu decoction pretreatment at a medium dose (4.8 g/mL/100 g), and Heshouwu pill (2.06 g/mL/100 g) significantly reversed these changes. Heshouwu decoction pretreatment and high-dose Heshouwu decoction had the greatest anti-aging effects. These experimental findings indicate that Heshouwu decoction can improve hypothalamic-pituitary-testicular axis secretion in a subacute aging rat model, and prevent and delay gonadal axis aging, with an effect superior to that of Heshouwu pill.展开更多
A green low-cost redox flow battery using Zn/Zn^(2+) redox couple in HAc/NaAc medium and Fe^(2+)/Fe^(3+) redox couple in H_2SO_4 medium was first proposed and investigated for potential stationary energy storage appli...A green low-cost redox flow battery using Zn/Zn^(2+) redox couple in HAc/NaAc medium and Fe^(2+)/Fe^(3+) redox couple in H_2SO_4 medium was first proposed and investigated for potential stationary energy storage applications. The presence of HAc/NaAc in the negative electrolyte can keep the pH between 2.0 and 6.0even when a large amount of H^+ ions move into negative electrolyte from positive electrolyte through ion exchange membrane. In the pH range of 2.0–6.0, the chemical reaction of Zn species with H^+ species is very insignificant; furthermore, the electroreduction of H^+ ion on the negative electrode is significantly suppressed at this pH range. The zinc-ferrum redox flow battery(Zn/Fe RFB) operated within a voltage window of 0.5–2.0 V with a nearly 90% utilization ratio, and its energy efficiency is around 71.1% at room temperature. These results show that Zn/Fe RFB is a promising option as a stationary energy storage equipment.展开更多
Air-breathing proton exchange membrane fuel cells(PEMFCs) are very promising portable energy with many advantages. However, its power density is low and many additional supporting parts affect its specific power. In t...Air-breathing proton exchange membrane fuel cells(PEMFCs) are very promising portable energy with many advantages. However, its power density is low and many additional supporting parts affect its specific power. In this paper, we aim to improve the air diffusion and fuel cell performance by employing a novel condensing-tower-like curved flow field rather than an additional fan, making the fuel cell more compact and has less internal power consumption. Polarization curve test and galvanostatic discharge test are carried out and proved that curved flow field can strengthen the air diffusion into the PEMFC and improve its performance. With appropriate curved flow field, the fuel cell peak power can be 55.2%higher than that of planar flow field in our study. A four-layer stack with curved cathode flow field is fabricated and has a peak power of 2.35 W(120 W/kg).展开更多
The unveiling of MOF growth mechanism is hampered by the lack of fundamental knowledge about the very early stage of nucleation,especially the form and ratio of molecular species in the solution for crystal growth.Her...The unveiling of MOF growth mechanism is hampered by the lack of fundamental knowledge about the very early stage of nucleation,especially the form and ratio of molecular species in the solution for crystal growth.Herein,we report the detection of growth species for a series of MOFs with mono-linker,CuMOF-2-BDC and Cu-MOF-2-NDC,and two linkers,MTV-MOF-2-(C_(4)H_(4))x,by high resolution ESI-MS,where a large variety of Cu-containing species are identified unambiguously.The solvent molecules such as H_(2)O,methanol and DMF participate in the formation of these species,other than ethanol.Furthermore,in the growth solution of MTV-MOF-2-(C_(4)H_(4))x,growth species containing two different organic linkers are observed.The feeding ratio is not the only factor controlling the distribution of growth species for MTVMOFs,but also the solvent involves in coordination,an aspect usually overlooked previously.展开更多
Flexible electrochemical power sources are attracting increasing attentions for their unique advantages like flexibility, shape diversity, light weight and excellent mechanical properties. In this research, we discove...Flexible electrochemical power sources are attracting increasing attentions for their unique advantages like flexibility, shape diversity, light weight and excellent mechanical properties. In this research, we discover that the current collector can dramatically affect the performance of flexible electrochemical power sources with large size. For flexible air-breathing proton exchange membrane fuel cell (PEMFC), the performance could have more than 8 times increase by only adjusting the directions of current collectors. The different performances of different current collection types are mainly attributed to the diverse lengths of the electron transfer pathways. In addition, the conductivity of current collector can dramatically affect the capability of flexible PEMFCs with large-size. The flexible PEMFCs with thicker carbon nanotube membrane as current collector (low electric resistance) show higher ability. A mathematic model is successfully built in this work to further understand the performance. Moreover, the model and simulation are also applicable to other flexible power sources, such as flexible Li-ion battery and supercapacitor.展开更多
Many studies focus on mineralization of huge magnetite ore deposits and petrogenesis of their large-volume host rocks.However,magma generation of those small-scale intrusions with enrichment of magnetite is poorly rep...Many studies focus on mineralization of huge magnetite ore deposits and petrogenesis of their large-volume host rocks.However,magma generation of those small-scale intrusions with enrichment of magnetite is poorly reported and paid attention to.We here carry out an integrated study of magnetite chemistry,U-Pb zircon dating,geochemistry,and Sr-Nd-Hf isotopes for the magnetite-rich intermediate-mafic rocks from the Helishan pluton in the southwestern Alxa Block,Northwest China.This,together with several previously reported magnetite/iron-rich intrusions nearby,is capable of providing some constraints on magma generation of magnetite/iron-rich intrusive rocks.The Helishan pluton,dated at ca.290 Ma,consists of hornblende gabbro,diorite,and quartz monzodiorite with~3%-5%magnetite in all the lithologies.Study on magnetite chemistry manifests a magmatic origin for them.All the lithologies display high TFeO/MgO ratio (1.71-1.89),weakly fractionated REE patterns((La/Yb)_(N)=1.82-10.17),enrichment of Rb,Sr,and Pb,and depletion of high field strength elements.They have (^(87)Sr/^(86)Sr)_(i) values of 0.705 2 to 0.705 8,ε_(Nd)(t) values of+0.03 to+0.64,and zircon ε_(Hf)(t) values of +6.5 to+12.0.We propose that they were derived from partial melting of iron-rich metasomatized lithospheric mantle.The systematic variations of Sr/Y ratios and Nd-Hf isotopic compositions with time for the Paleozoic igneous rocks at the southwestern Alxa Block indicate ever existence of thinning and rebirth of lithospheric mantle.This geodynamic process could be the potential mechanism to give rise to the iron-rich signature of the reborn mantle sources of the Helishan pluton.For intermediatemafic intrusions at subduction zones,they are unlikely to form considerable magnetite ore deposits since their modest magmatic flux and early fractional crystallization of magnetite at a high oxygen fugacity and H_(2)O condition.展开更多
A novel iron-hydrogen battery system, whose Fe^(3+)/Fe^(2+)cathode circumvents slowly dynamic oxygen reduction reaction and anode is fed with clean and cordial hydrogen, is systematically investigated. The maximum dis...A novel iron-hydrogen battery system, whose Fe^(3+)/Fe^(2+)cathode circumvents slowly dynamic oxygen reduction reaction and anode is fed with clean and cordial hydrogen, is systematically investigated. The maximum discharge power density of the iron-hydrogen battery reaches to 96.0 m W/cm^(2) under the room temperature. The capacity reaches to 17.2 Ah/L and the coulombic and energy efficiency are achieved to99% and 86%, respectively, during the galvanostatic charge-discharge test. Moreover, stable cycling test is observed for more than 240 h and 100 cycles with the iron sulfate in the sulfuric acid solutions. It is found that air plasma treatment onto the cathode carbon paper can generate the oxygen-containing groups and increase the hydrophilic pores proportion to ca. 40%, enlarging nearly 6-fold effective diffusion coefficient and improving the mass transfer in the battery performance. The simple iron-hydrogen energy storage battery design offers us a new strategy for the large-scale energy storage and hydrogen involved economy.展开更多
Nanobubble is a rising research field,which attracts more and more attentions due to its potential applications in medical science,catalysis,electrochemistry and etc.To better implement these applications,it is urgent...Nanobubble is a rising research field,which attracts more and more attentions due to its potential applications in medical science,catalysis,electrochemistry and etc.To better implement these applications,it is urgent to understand one of the most important mechanisms of nanobubbles,the evolution.However,few attentions have been paid in this aspect because of the methodology difficulties.Here we successfully used dark-field microscopy to study the evolution process of single nanobubbles generated from formic acid dehydrogenation on single Pd-Ag nanoplates.We found some of the nanobubbles in this system can exhibit three distinct states representing different sizes,which can transform among each other.These transitions are not direct but through some intermediate states.Further kinetic analysis reveals complicated mechanisms behind the evolution of single nanobubbles.The results acquired from this study can be applicable to nanobubble systems in general and provide insights into the understanding of mechanisms affecting the stability of nanobubbles and their applications.展开更多
Different from studies where less defective platinum(Pt)-based nanomaterials have been widely used to improve the catalysis of the oxygen reduction reaction(ORR)for proton-exchange membrane fuel cells(PEMFCs),herein w...Different from studies where less defective platinum(Pt)-based nanomaterials have been widely used to improve the catalysis of the oxygen reduction reaction(ORR)for proton-exchange membrane fuel cells(PEMFCs),herein we have demonstrated that a new class of Pt nanorods(NRs)with a highly distorted configuration can be applied as an advanced,high-efficiency fuel cell catalyst,as transformed from spongy Pt–tellurium NRs(PtTe2 NRs)through sequential chemical and electrochemical aging procedures.The resulting highly distorted Pt NRs exhibit excellent ORR-specific and mass activities of 4.70mA cm−2 and 2.77 Amg−1 Pt at 0.90 V versus the reversible hydrogen electrode(RHE),which are 18.8 and 16.3 times higher than those of commercial Pt/C catalyst,and the mass activity is 6.3 times higher than 2020 U.S.Department of Energy target.Additionally,negligible activity decays were observed after 30,000 cycles.The high ORR performance endows these unique Pt NRs with enhanced activity and lifetimes for practical fuel cell catalysis in comparison with commercial Pt/C,which is consistent with the experimental results.It has been demonstrated that the anomaly of strong electron–lattice coupling suppresses Coulombic repulsion for barrier-free electron transfer while concurrently exposing a large number of active sites,which is a key to superior high-performance fuel cell reactions.展开更多
基金supported by the Open Foundation of State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University (No.200906)the Natural Science Foundation of Jiangxi Province (No.2010GZH0048)+1 种基金the National Natural Science Foundation of China (No. 21067004)the Young Science Foundation of Jiangxi Province Education Office (No. GJJ10150)
文摘Nano-sized γ-alumina (γ-Al2O3) was first prepared by a precipitation method. Then, active component of cobalt and a series of alkaline- earth metal promoters or nickel (Ni) with different contents were loaded on the γ-Al2O3 support. The catalysts were characterized by N2 adsorption-desorption, X-ray diffraction (XRD) and thermogravimetry analysis (TGA). The activity and selectivity of the catalysts in catalytic partial oxidation (CPO) of methane have been compared with Co/γ-Al2O3, and it is found that the catalytic activity, selectivity, and stability are enhanced by the addition of alkaline-earth metals and nickel. The optimal loadings of strontium (Sr) and Ni were 6 and 4 wt%, respectively. This finding will be helpful in designing the trimetallic Co-Ni-Sr/γ-Al2O3 catalysts with high performance in CPO of methane.
基金supported by the Talent Introduction Fund of Hebei University, No. 2010-183the Medical Science Special Fund of Hebei University, No. 2012A1005+1 种基金the Key Project of Hebei Provincial Health Department, No. 20110151a grant from Hebei Provincial Administration of Traditional Chinese Medicine, No. 2011104
文摘An increasing amount of evidence demonstrates the anti-aging effect of Heshouwu in pill form. In this study, a subacute aging rat model was established by continuous intraperitoneal injection of D-galactose and treated with Heshouwu decoction (a Chinese herb for tonifying the kidney, comprising Heshouwu pill, Herba Epimedii, Radix Salviae Miltiorrhiae, and Poria). Heshouwu pill treated rats were the positive control group. Radioimmunoassay, immunohistochemical staining, and western blot assay showed hypothalamic gonadotropin-releasing hormone, hypothalamic substance P, and serum gonadotropin levels to be significantly increased in the model rats; the concentrations of hypothalamic β-endorphin, and serum levels of insulin-like growth factor 1 and testosterone were significantly decreased. 17β- and 3β-hydroxysteroid dehydrogenase expression in testicular tissue was also decreased. Intragastric administration of Heshouwu decoction at high (9.6 g/mL/100 g), medium (4.8 g/mL/100 g), and low (2.4 g/mL/100 g) doses, Heshouwu decoction pretreatment at a medium dose (4.8 g/mL/100 g), and Heshouwu pill (2.06 g/mL/100 g) significantly reversed these changes. Heshouwu decoction pretreatment and high-dose Heshouwu decoction had the greatest anti-aging effects. These experimental findings indicate that Heshouwu decoction can improve hypothalamic-pituitary-testicular axis secretion in a subacute aging rat model, and prevent and delay gonadal axis aging, with an effect superior to that of Heshouwu pill.
基金financially supported by the NSFC(No.21361010,China)
文摘A green low-cost redox flow battery using Zn/Zn^(2+) redox couple in HAc/NaAc medium and Fe^(2+)/Fe^(3+) redox couple in H_2SO_4 medium was first proposed and investigated for potential stationary energy storage applications. The presence of HAc/NaAc in the negative electrolyte can keep the pH between 2.0 and 6.0even when a large amount of H^+ ions move into negative electrolyte from positive electrolyte through ion exchange membrane. In the pH range of 2.0–6.0, the chemical reaction of Zn species with H^+ species is very insignificant; furthermore, the electroreduction of H^+ ion on the negative electrode is significantly suppressed at this pH range. The zinc-ferrum redox flow battery(Zn/Fe RFB) operated within a voltage window of 0.5–2.0 V with a nearly 90% utilization ratio, and its energy efficiency is around 71.1% at room temperature. These results show that Zn/Fe RFB is a promising option as a stationary energy storage equipment.
基金financial support granted by National Key R&D Program of China from Ministry of Science and Technology of China (Nos. 2020YFB1505700, 2016YFA0200700)China Postdoctoral Science Foundation (No. 2021M702408)+4 种基金the National Natural Science Foundation of China (No. 22172191)Dongyue Polymer Material Company of Dongyue FederationState Key Laboratory of Fluorinated Functional Membrane Materials(Dongyue Group institute)Dongyue Future Hydrogen Energy Materials Companysponsored by the Collaborative Innovation Center of Suzhou Nano Science and Technology。
文摘Air-breathing proton exchange membrane fuel cells(PEMFCs) are very promising portable energy with many advantages. However, its power density is low and many additional supporting parts affect its specific power. In this paper, we aim to improve the air diffusion and fuel cell performance by employing a novel condensing-tower-like curved flow field rather than an additional fan, making the fuel cell more compact and has less internal power consumption. Polarization curve test and galvanostatic discharge test are carried out and proved that curved flow field can strengthen the air diffusion into the PEMFC and improve its performance. With appropriate curved flow field, the fuel cell peak power can be 55.2%higher than that of planar flow field in our study. A four-layer stack with curved cathode flow field is fabricated and has a peak power of 2.35 W(120 W/kg).
基金the National Natural Science Foundation of China(Nos.91545205,91622103,21971199 and 22025106)National Key Research and Development Project(Nos.2020YFB1505700,2016YFA0200700 and 2018YFA-0704000)+1 种基金Innovation Team of Wuhan University(No.2042017kf0232)the Fundamental Research Funds for the Central Universities(No.2042020kf0214)。
文摘The unveiling of MOF growth mechanism is hampered by the lack of fundamental knowledge about the very early stage of nucleation,especially the form and ratio of molecular species in the solution for crystal growth.Herein,we report the detection of growth species for a series of MOFs with mono-linker,CuMOF-2-BDC and Cu-MOF-2-NDC,and two linkers,MTV-MOF-2-(C_(4)H_(4))x,by high resolution ESI-MS,where a large variety of Cu-containing species are identified unambiguously.The solvent molecules such as H_(2)O,methanol and DMF participate in the formation of these species,other than ethanol.Furthermore,in the growth solution of MTV-MOF-2-(C_(4)H_(4))x,growth species containing two different organic linkers are observed.The feeding ratio is not the only factor controlling the distribution of growth species for MTVMOFs,but also the solvent involves in coordination,an aspect usually overlooked previously.
基金financial support granted by Ministry of Science and Technology of China(Nos. 2016YFE0105700, 2016YFA0200700)the National Natural Science Foundation of China (Nos. 21373264, 21573275)+2 种基金China Postdoctoral Science Foundation(No. 2018M632406)the Science and Technology Project of Nanchang(No. 2017-SJSYS-008)the Collaborative Innovation Center of Suzhou Nano Science and Technology
文摘Flexible electrochemical power sources are attracting increasing attentions for their unique advantages like flexibility, shape diversity, light weight and excellent mechanical properties. In this research, we discover that the current collector can dramatically affect the performance of flexible electrochemical power sources with large size. For flexible air-breathing proton exchange membrane fuel cell (PEMFC), the performance could have more than 8 times increase by only adjusting the directions of current collectors. The different performances of different current collection types are mainly attributed to the diverse lengths of the electron transfer pathways. In addition, the conductivity of current collector can dramatically affect the capability of flexible PEMFCs with large-size. The flexible PEMFCs with thicker carbon nanotube membrane as current collector (low electric resistance) show higher ability. A mathematic model is successfully built in this work to further understand the performance. Moreover, the model and simulation are also applicable to other flexible power sources, such as flexible Li-ion battery and supercapacitor.
基金supported by the National Natural Science Foundation of China(No.41573021)the Most Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources(No.MSFGPMR201601-2)。
文摘Many studies focus on mineralization of huge magnetite ore deposits and petrogenesis of their large-volume host rocks.However,magma generation of those small-scale intrusions with enrichment of magnetite is poorly reported and paid attention to.We here carry out an integrated study of magnetite chemistry,U-Pb zircon dating,geochemistry,and Sr-Nd-Hf isotopes for the magnetite-rich intermediate-mafic rocks from the Helishan pluton in the southwestern Alxa Block,Northwest China.This,together with several previously reported magnetite/iron-rich intrusions nearby,is capable of providing some constraints on magma generation of magnetite/iron-rich intrusive rocks.The Helishan pluton,dated at ca.290 Ma,consists of hornblende gabbro,diorite,and quartz monzodiorite with~3%-5%magnetite in all the lithologies.Study on magnetite chemistry manifests a magmatic origin for them.All the lithologies display high TFeO/MgO ratio (1.71-1.89),weakly fractionated REE patterns((La/Yb)_(N)=1.82-10.17),enrichment of Rb,Sr,and Pb,and depletion of high field strength elements.They have (^(87)Sr/^(86)Sr)_(i) values of 0.705 2 to 0.705 8,ε_(Nd)(t) values of+0.03 to+0.64,and zircon ε_(Hf)(t) values of +6.5 to+12.0.We propose that they were derived from partial melting of iron-rich metasomatized lithospheric mantle.The systematic variations of Sr/Y ratios and Nd-Hf isotopic compositions with time for the Paleozoic igneous rocks at the southwestern Alxa Block indicate ever existence of thinning and rebirth of lithospheric mantle.This geodynamic process could be the potential mechanism to give rise to the iron-rich signature of the reborn mantle sources of the Helishan pluton.For intermediatemafic intrusions at subduction zones,they are unlikely to form considerable magnetite ore deposits since their modest magmatic flux and early fractional crystallization of magnetite at a high oxygen fugacity and H_(2)O condition.
基金financial support granted by National Key R&D Program of China (No.2020YFB1505704)Dongyue Polymer Material Company of Dongyue Federation+2 种基金State Key Laboratory of Fluorinated Functional Membrane Materials (Dongyue Group institute)Dongyue Future Hydrogen Energy Materials Companysponsored by the Collaborative Innovation Center of Suzhou Nano Science and Technology。
文摘A novel iron-hydrogen battery system, whose Fe^(3+)/Fe^(2+)cathode circumvents slowly dynamic oxygen reduction reaction and anode is fed with clean and cordial hydrogen, is systematically investigated. The maximum discharge power density of the iron-hydrogen battery reaches to 96.0 m W/cm^(2) under the room temperature. The capacity reaches to 17.2 Ah/L and the coulombic and energy efficiency are achieved to99% and 86%, respectively, during the galvanostatic charge-discharge test. Moreover, stable cycling test is observed for more than 240 h and 100 cycles with the iron sulfate in the sulfuric acid solutions. It is found that air plasma treatment onto the cathode carbon paper can generate the oxygen-containing groups and increase the hydrophilic pores proportion to ca. 40%, enlarging nearly 6-fold effective diffusion coefficient and improving the mass transfer in the battery performance. The simple iron-hydrogen energy storage battery design offers us a new strategy for the large-scale energy storage and hydrogen involved economy.
基金supported by Ministry of Science and Technology of China(Nos.2016YFA0200700,2016YFE0105700)the National Natural Science Foundation of China(Nos.21373264,21573275)+3 种基金the Natural Science Foundation of Jiangsu Province(No.BK20150362)Suzhou Institute of Nano-tech and Nanobionics(No.Y3AAA11004)Thousand Youth Talents Plan(No.Y3BQA11001)the Collaborative Innovation Center of Suzhou Nano Science and Technology。
文摘Nanobubble is a rising research field,which attracts more and more attentions due to its potential applications in medical science,catalysis,electrochemistry and etc.To better implement these applications,it is urgent to understand one of the most important mechanisms of nanobubbles,the evolution.However,few attentions have been paid in this aspect because of the methodology difficulties.Here we successfully used dark-field microscopy to study the evolution process of single nanobubbles generated from formic acid dehydrogenation on single Pd-Ag nanoplates.We found some of the nanobubbles in this system can exhibit three distinct states representing different sizes,which can transform among each other.These transitions are not direct but through some intermediate states.Further kinetic analysis reveals complicated mechanisms behind the evolution of single nanobubbles.The results acquired from this study can be applicable to nanobubble systems in general and provide insights into the understanding of mechanisms affecting the stability of nanobubbles and their applications.
基金supported by the Ministry of Science and Technology of China(2016YFA0204100 and 2017YFA0208200)the National Natural Science Foundation of China(21571135)+3 种基金Young Thousand Talented Program,the Natural Science Foundation of Jiangsu Higher Education Institutions(17KJB150032)the Special Funded Project of China Postdoctoral Science Foundation(2019T120453)the project of scientific and technologic infrastructure of Suzhou(SZS201708)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),and start-up support from Soochow University.
文摘Different from studies where less defective platinum(Pt)-based nanomaterials have been widely used to improve the catalysis of the oxygen reduction reaction(ORR)for proton-exchange membrane fuel cells(PEMFCs),herein we have demonstrated that a new class of Pt nanorods(NRs)with a highly distorted configuration can be applied as an advanced,high-efficiency fuel cell catalyst,as transformed from spongy Pt–tellurium NRs(PtTe2 NRs)through sequential chemical and electrochemical aging procedures.The resulting highly distorted Pt NRs exhibit excellent ORR-specific and mass activities of 4.70mA cm−2 and 2.77 Amg−1 Pt at 0.90 V versus the reversible hydrogen electrode(RHE),which are 18.8 and 16.3 times higher than those of commercial Pt/C catalyst,and the mass activity is 6.3 times higher than 2020 U.S.Department of Energy target.Additionally,negligible activity decays were observed after 30,000 cycles.The high ORR performance endows these unique Pt NRs with enhanced activity and lifetimes for practical fuel cell catalysis in comparison with commercial Pt/C,which is consistent with the experimental results.It has been demonstrated that the anomaly of strong electron–lattice coupling suppresses Coulombic repulsion for barrier-free electron transfer while concurrently exposing a large number of active sites,which is a key to superior high-performance fuel cell reactions.
