近年来,钠离子电池电极材料引起了研究者们极大的兴趣.过渡金属硒化物具有高钠离子存储容量,是一种具有前景的钠离子电池负极材料.然而,该类材料较低的电导率以及钠离子脱嵌过程中巨大的体积膨胀,导致了其较差的钠离子电池倍率性能和循...近年来,钠离子电池电极材料引起了研究者们极大的兴趣.过渡金属硒化物具有高钠离子存储容量,是一种具有前景的钠离子电池负极材料.然而,该类材料较低的电导率以及钠离子脱嵌过程中巨大的体积膨胀,导致了其较差的钠离子电池倍率性能和循环寿命.本工作采用二维的双金属有机框架材料为模板,设计制造了多孔铁掺杂NiSe_(2)纳米片材料(Fe-NiSe_(2)@C NSs),该结构具有充分暴露的活性位点,增强的电导率,丰富的空隙和短电子传输路径,易于适应钠离子脱嵌带来的体积膨胀应力,并具有快速的电荷转移动力学.作为钠离子电池负极材料时,Fe-NiSe_(2)@C NSs表现出高比容量(5 A g^(-1)电流密度下为302 mA h g^(-1))和优异的循环稳定性(5 A g^(-1)的电流密度下循环1000圈容量保持率为99%).此外,该材料在与Na3V2(PO4)2O2F正极材料组成的钠离子全电池中也表现出了高能量密度(107 W h kg^(-1)).大量非原位表征和理论计算进一步验证了Fe掺杂使电子密度增大,对于提升Fe-NiSe_(2)@C NSs的钠离子电池综合性能具有重要意义.本研究为制备高性能钠离子电池电极材料提供了新思路.展开更多
The development of efficient, low-cost, for water splitting, particularly those stable, non-noble-metal electrocatalysts that can catalyze both the hydrogen evolution reaction （HER） at the cathode and oxygen evoluti...The development of efficient, low-cost, for water splitting, particularly those stable, non-noble-metal electrocatalysts that can catalyze both the hydrogen evolution reaction （HER） at the cathode and oxygen evolution reaction （OER） at the anode, is a challenge. We have developed a facile method for synthesizing CoSe2 nanoparticles uniformly anchored on carbon fiber paper （CoSe2/CF） via pyrolysis and selenization of in situ grown zeolitic imidazolate framework-67 （ZIF-67）. CoSe2/CF shows high and stable catalytic activity in both the HER and OER in alkaline solution. At a low cell potential, i.e., 1.63 V, a water electrolyzer equipped with two CoSe2/CF electrodes gave a water-splitting current of 10 mA.cm-2. At a current of 20 mA-cm-2, it can operate without degradation for 30 h. This study not only offers a cost-effective solution for water splitting but also provides a new strategy for developing various catalytic nanostructures by changing the metal-organic framework precursors.展开更多
The synthesis of a composite of cobalt phosphide nanowires and reduced graphene oxide （denoted CoP/RGO） via a facile hydrothermal method combined with a subsequent annealing step is reported. The resulting composite...The synthesis of a composite of cobalt phosphide nanowires and reduced graphene oxide （denoted CoP/RGO） via a facile hydrothermal method combined with a subsequent annealing step is reported. The resulting composite presents large specific surface area and enhanced conductivity, which can effectively facilitate charge transport and accommodates variations in volume during the lithiation/de-lithiation processes. As a result, the CoP/RGO nanocomposite manifests a high reversible specific capacity of 960 mA·h-g-1 over 200 cycles at a current density of 0.2 A·g-1 （297 mA·h·g-1 over 10,000 cycles at a current density of 20 A.g-1） and excellent rate capability （424 mA·h·g-1 at a current density of 10 A·g-1）.展开更多
Hydrogel is a potential matrix material of electronic-skins(E-skins)because of its excellent ductility,tunability,and biocompatibility.However,hydrogel-based E-Skins will inevitably lose their sensing performance in p...Hydrogel is a potential matrix material of electronic-skins(E-skins)because of its excellent ductility,tunability,and biocompatibility.However,hydrogel-based E-Skins will inevitably lose their sensing performance in practical applications for water loss,physical damage,and ambient interferences.It remains a challenge to manufacture highly durable gel-based E-skins.Herein,an E-Skin is fabricated by introducing ionic liquids(ILs)into MXene-composited binary polymer network.The obtained ionic gel shows excellent mechanical properties,strong adhesion,and superior tolerance to harsh environments.The E-skin exhibits high sensitivity to both strain and pressure in a wide range of deformations,which enables a monitoring function for various human motions and physiological activities.Importantly,the E-skin shows consistent electrical response after being stored in the open air for 30 days and can be quickly healed by irradiation with 808 nm near-infrared light,originating from the photo-thermal effect induced self-healing acceleration.It is noteworthy that the E-skin also reveals a highly sensitive perception of temperature and near-infrared light,displaying the promising potential applications in the multifunctional flexible sensor.展开更多
Smart flexible electronics with underwater motion detection have become a promising research aspect in intelligent perception.Inspired by the strong adaptability of marine creatures to complex underwater environments,...Smart flexible electronics with underwater motion detection have become a promising research aspect in intelligent perception.Inspired by the strong adaptability of marine creatures to complex underwater environments,conventional biocompatible hydrogels are worth developing into organogels with preferred underwater adhesive properties,hydrophobic and antiswelling performance,and motion perception ability.Herein,a highly sensitive organogel sensor exhibiting good hydrophobicity,electromechanical properties,and adhesion properties was prepared for underwater utilization by regulating the chemical components and internal interactions.The synergistic effect of massive reversible noncovalent bonds ensures the organogel’s excellent underwater adhesion to multifarious substrates.Meanwhile,the interactions of hydrophobic conductive fillers and the dynamic hydrophobic associations in the organogel endow it with satisfactory hydrophobic performance(contact angle of111.8°)and antiswelling property(equilibrium swelling ratio of-31%after 15-day immersion).The fabricated flexible organogel strain sensor exhibits high sensitivity(gauge factor of1.96),ultrafast response rate(79.1 ms),low limit of detection(0.45 Pa),and excellent cyclic stability(1044 tensile cycles followed by 3981 compressive cycles).Results demonstrate the proposed organogel’s precise perception of sophisticated human motions in air and underwater,which expands its application scenarios.展开更多
The rational design of earth-abundant catalysts with excellent water splitting activities is important to obtain clean fuels for sustainable energy devices. In this study, mixed transition metal oxide nanoparticles en...The rational design of earth-abundant catalysts with excellent water splitting activities is important to obtain clean fuels for sustainable energy devices. In this study, mixed transition metal oxide nanoparticles encapsulated in nitrogendoped carbon （denoted as AB2O4@NC） were developed using a one-pot protocol, wherein a metal-organic complex was adopted as the precursor. As a proof of concept, MnCo2O4@NC was used as an electrocatalyst for water oxidation, and demonstrated an outstanding electrocatalytic activity with low overpotential to achieve a current density of 10 mA·cm^-1 0/10 = 287 mV）, small Tafel slope （55 mV·dec^-1）, and high stability （96% retention after 20 h）. The excellent electrochemical performance benefited from the synergistic effects of the MnCo2O4 nanoparticles and nitrogen-doped carbon, as well as the assembled mesoporous nanowire structure. Finally, a highly stable all-solid-state supercapacitor based on MnCo2O4@NC was demonstrated （1.5% decay after 10,000 cycles）.展开更多
Hydrogel systems promote the development of flexible energy storage devices because of their inherent mechanical elasticity and ionic conductivity.However,achieving stable energy storage capacity under violent mechani...Hydrogel systems promote the development of flexible energy storage devices because of their inherent mechanical elasticity and ionic conductivity.However,achieving stable energy storage capacity under violent mechanical deformation is still a challenge for hydrogel devices.In this work,an all-in-one integrated supercapacitor(AISC)was assembled using in situ deposited polyaniline/graphene oxide nanocomposites for both sides of the incorporated ionic hydrogel electrolyte.The assembly process of the AISC was greatly simplified,and the displacement and separation of the multilayer structured hydrogel complex were avoided during mechanical deformation.The hydrogel electrolyte with ionic additives exhibited strong adhesion and flexibility,and high ionic conductivity,thereby ensuring the excellent specific capacitance and rate performance of the AISC.The specific capacitances of the AISC were 222.8 mF cm^(−2) at the current density of 0.2 mA cm^(−2) and 151.7 mF cm^(−2) at 3.2 mA cm^(−2).The capacitance retention rate was 68.1%.The energy density of a piece of the device reached 44.6μW h cm^(−2) at a power density of 120.0μW cm^(−2).Moreover,reliable and reproducible energy storage was acquired under bending,compression,and stretching deformations.The AISC was also easily assembled in series to power a light-emitting diode(LED)light.This work provides a facile approach to the construction of flexible supercapacitors for the development of energy storage devices in flexible electronics.展开更多
基金financially supported by the National Natural Science Foundation of China(51801030)the Science and Technology Development Plan of Suzhou(ZXL2021176)+1 种基金China Postdoctoral Science Foundation(2022M711686)Jiangsu Provincial Funds for the Young Scholars(BK20190978)。
文摘近年来,钠离子电池电极材料引起了研究者们极大的兴趣.过渡金属硒化物具有高钠离子存储容量,是一种具有前景的钠离子电池负极材料.然而,该类材料较低的电导率以及钠离子脱嵌过程中巨大的体积膨胀,导致了其较差的钠离子电池倍率性能和循环寿命.本工作采用二维的双金属有机框架材料为模板,设计制造了多孔铁掺杂NiSe_(2)纳米片材料(Fe-NiSe_(2)@C NSs),该结构具有充分暴露的活性位点,增强的电导率,丰富的空隙和短电子传输路径,易于适应钠离子脱嵌带来的体积膨胀应力,并具有快速的电荷转移动力学.作为钠离子电池负极材料时,Fe-NiSe_(2)@C NSs表现出高比容量(5 A g^(-1)电流密度下为302 mA h g^(-1))和优异的循环稳定性(5 A g^(-1)的电流密度下循环1000圈容量保持率为99%).此外,该材料在与Na3V2(PO4)2O2F正极材料组成的钠离子全电池中也表现出了高能量密度(107 W h kg^(-1)).大量非原位表征和理论计算进一步验证了Fe掺杂使电子密度增大,对于提升Fe-NiSe_(2)@C NSs的钠离子电池综合性能具有重要意义.本研究为制备高性能钠离子电池电极材料提供了新思路.
基金The project is supported by the National Natural Science Foundation of China （Nos. 21275076 and 61328401）, Jiangsu Provincial Founds for Distinguished Young Scholars （No. BK20130046）, Key University Science Research Project of Jiangsu Province （No. 15KJA430006）, Program for New Century Excellent Talents in University （No. NCET-13-0853）, QingLan Project, Nantong Key Laboratory of New Materials Industrial Technology, SERC Grant （#102170 0142） from A＇STAR Singapore, the scholarship from China Scholarships Council （No. 201508320304）.
文摘The development of efficient, low-cost, for water splitting, particularly those stable, non-noble-metal electrocatalysts that can catalyze both the hydrogen evolution reaction （HER） at the cathode and oxygen evolution reaction （OER） at the anode, is a challenge. We have developed a facile method for synthesizing CoSe2 nanoparticles uniformly anchored on carbon fiber paper （CoSe2/CF） via pyrolysis and selenization of in situ grown zeolitic imidazolate framework-67 （ZIF-67）. CoSe2/CF shows high and stable catalytic activity in both the HER and OER in alkaline solution. At a low cell potential, i.e., 1.63 V, a water electrolyzer equipped with two CoSe2/CF electrodes gave a water-splitting current of 10 mA.cm-2. At a current of 20 mA-cm-2, it can operate without degradation for 30 h. This study not only offers a cost-effective solution for water splitting but also provides a new strategy for developing various catalytic nanostructures by changing the metal-organic framework precursors.
文摘The synthesis of a composite of cobalt phosphide nanowires and reduced graphene oxide （denoted CoP/RGO） via a facile hydrothermal method combined with a subsequent annealing step is reported. The resulting composite presents large specific surface area and enhanced conductivity, which can effectively facilitate charge transport and accommodates variations in volume during the lithiation/de-lithiation processes. As a result, the CoP/RGO nanocomposite manifests a high reversible specific capacity of 960 mA·h-g-1 over 200 cycles at a current density of 0.2 A·g-1 （297 mA·h·g-1 over 10,000 cycles at a current density of 20 A.g-1） and excellent rate capability （424 mA·h·g-1 at a current density of 10 A·g-1）.
基金The work was supported by Jiangsu Province Policy Guidance Plan(No.BZ2019014),NSF of Jiangsu Province(No.BK20190688)NSF of the Jiangsu Higher Education Institutions(No.21KJB430039)‘Taishan scholars'construction special fund of Shandong Province.
文摘Hydrogel is a potential matrix material of electronic-skins(E-skins)because of its excellent ductility,tunability,and biocompatibility.However,hydrogel-based E-Skins will inevitably lose their sensing performance in practical applications for water loss,physical damage,and ambient interferences.It remains a challenge to manufacture highly durable gel-based E-skins.Herein,an E-Skin is fabricated by introducing ionic liquids(ILs)into MXene-composited binary polymer network.The obtained ionic gel shows excellent mechanical properties,strong adhesion,and superior tolerance to harsh environments.The E-skin exhibits high sensitivity to both strain and pressure in a wide range of deformations,which enables a monitoring function for various human motions and physiological activities.Importantly,the E-skin shows consistent electrical response after being stored in the open air for 30 days and can be quickly healed by irradiation with 808 nm near-infrared light,originating from the photo-thermal effect induced self-healing acceleration.It is noteworthy that the E-skin also reveals a highly sensitive perception of temperature and near-infrared light,displaying the promising potential applications in the multifunctional flexible sensor.
基金supported by the Natural Science Foundation of Jiangsu Province(BK20190688)the Natural Science Foundation of Jiangsu Higher Education Institutions(21KJB430039)Taishan Scholar Construction Special Fund of Shandong Province。
文摘Smart flexible electronics with underwater motion detection have become a promising research aspect in intelligent perception.Inspired by the strong adaptability of marine creatures to complex underwater environments,conventional biocompatible hydrogels are worth developing into organogels with preferred underwater adhesive properties,hydrophobic and antiswelling performance,and motion perception ability.Herein,a highly sensitive organogel sensor exhibiting good hydrophobicity,electromechanical properties,and adhesion properties was prepared for underwater utilization by regulating the chemical components and internal interactions.The synergistic effect of massive reversible noncovalent bonds ensures the organogel’s excellent underwater adhesion to multifarious substrates.Meanwhile,the interactions of hydrophobic conductive fillers and the dynamic hydrophobic associations in the organogel endow it with satisfactory hydrophobic performance(contact angle of111.8°)and antiswelling property(equilibrium swelling ratio of-31%after 15-day immersion).The fabricated flexible organogel strain sensor exhibits high sensitivity(gauge factor of1.96),ultrafast response rate(79.1 ms),low limit of detection(0.45 Pa),and excellent cyclic stability(1044 tensile cycles followed by 3981 compressive cycles).Results demonstrate the proposed organogel’s precise perception of sophisticated human motions in air and underwater,which expands its application scenarios.
基金Acknowledgements The project is supported by the National Basic Research Program of China （No. 2014CB660808）, Jiangsu Provincial Founds for Distinguished Young Scholars （No. BK20130046）, the National Natural Science Foundation of China （Nos. 61525402 and 21275076）, QingLan Project, Program for New Century Excellent Talents in University （No. NCET-13-0853）, Synergetic Innovation Center for Organic Electronics and Information Displays, the Priority Academic Program Development of Jiangsu Higher Education Institutions （PAPD）, SERC Grant （No. 1021700142） from A＊STAR, Singapore, the scholarship from China Scholarships Council （No. 201508320304）, the Jiangsu Provincial Founds for Graduate Student Innovation Project （No. KYLX15_0821）.
文摘The rational design of earth-abundant catalysts with excellent water splitting activities is important to obtain clean fuels for sustainable energy devices. In this study, mixed transition metal oxide nanoparticles encapsulated in nitrogendoped carbon （denoted as AB2O4@NC） were developed using a one-pot protocol, wherein a metal-organic complex was adopted as the precursor. As a proof of concept, MnCo2O4@NC was used as an electrocatalyst for water oxidation, and demonstrated an outstanding electrocatalytic activity with low overpotential to achieve a current density of 10 mA·cm^-1 0/10 = 287 mV）, small Tafel slope （55 mV·dec^-1）, and high stability （96% retention after 20 h）. The excellent electrochemical performance benefited from the synergistic effects of the MnCo2O4 nanoparticles and nitrogen-doped carbon, as well as the assembled mesoporous nanowire structure. Finally, a highly stable all-solid-state supercapacitor based on MnCo2O4@NC was demonstrated （1.5% decay after 10,000 cycles）.
基金supported by the Natural Science Foundation of Shandong Province(ZR2020KB018)the Natural Science Foundation of Jiangsu Province(BK20190688)+2 种基金the Six Talent Peak Innovation Team in Jiangsu Province(TD-SWYY-009)the"Taishan Scholars"Construction Special Fund of Shandong Provincethe Industrial Alliance Fund of Shandong Provincial Key Laboratory(SDKL2016038)。
文摘Hydrogel systems promote the development of flexible energy storage devices because of their inherent mechanical elasticity and ionic conductivity.However,achieving stable energy storage capacity under violent mechanical deformation is still a challenge for hydrogel devices.In this work,an all-in-one integrated supercapacitor(AISC)was assembled using in situ deposited polyaniline/graphene oxide nanocomposites for both sides of the incorporated ionic hydrogel electrolyte.The assembly process of the AISC was greatly simplified,and the displacement and separation of the multilayer structured hydrogel complex were avoided during mechanical deformation.The hydrogel electrolyte with ionic additives exhibited strong adhesion and flexibility,and high ionic conductivity,thereby ensuring the excellent specific capacitance and rate performance of the AISC.The specific capacitances of the AISC were 222.8 mF cm^(−2) at the current density of 0.2 mA cm^(−2) and 151.7 mF cm^(−2) at 3.2 mA cm^(−2).The capacitance retention rate was 68.1%.The energy density of a piece of the device reached 44.6μW h cm^(−2) at a power density of 120.0μW cm^(−2).Moreover,reliable and reproducible energy storage was acquired under bending,compression,and stretching deformations.The AISC was also easily assembled in series to power a light-emitting diode(LED)light.This work provides a facile approach to the construction of flexible supercapacitors for the development of energy storage devices in flexible electronics.
