Rechargeable zinc-ion batteries employing a metallic zinc anode and aqueous electrolytes have received significant attention since they are safe,cost-effective,and environmentally friendly.Thanks to the intro-duction ...Rechargeable zinc-ion batteries employing a metallic zinc anode and aqueous electrolytes have received significant attention since they are safe,cost-effective,and environmentally friendly.Thanks to the intro-duction of orthophosphate ions,vanadium phosphates exhibit a higher working voltage as cathodes for zinc-ion batteries than other vanadium-based materials.However,due to the poor cycling stability and complex mechanism,stricter requirements are put forward on their manufacturing technique.Herein,a comprehensive review of the recent research progress in vanadium phosphate electrode materials is pre-sented,focusing on modification strategies based on different crystal structures and the energy storage behaviors of zinc ions in operation.Moreover,research directions and prospects are discussed.展开更多
Developing a highly efficient and cost-effective electrocatalyst for catalyzing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is fundamentally important for the practical application of the ove...Developing a highly efficient and cost-effective electrocatalyst for catalyzing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is fundamentally important for the practical application of the overall water splitting technique.Herein,a bifunctional electrocatalyst constituted by FexNiy and CeO_(2) nanoparticles supported on the N-doped nanocarbon(NC)is fabricated by a simple one-pot pyrolysis of the homogeneous mixture of Fe,Ni,Ce nitrates and melamine.The synergistic effect of each component in the FexNiy/CeO_(2)/NC gives rise to outstanding electrocatalytic activities and stability toward the HER and OER.For hydrogen evolution,the FexNiy/CeO_(2)/NC shows a smaller overpotential of 260 mV to achieve a current density of 50 mA cm^(-2) in a 1 M KOH electrolyte.More significantly,a small overpotential of 240 mV for FexNiy/CeO_(2)/NC affords an oxygen evolution current density of 10 mA cm^(-2),far lower than that of the benchmark IrO_(2).The practicability and electrocatalytic activity of the prepared FexNiy/CeO_(2)/NC under practical operation conditions are also investigated.In particular,the FexNiy/CeO_(2)/NC-based overall water splitting cell only needs a cell voltage of 1.70 V to output 10 mA cm^(-2) in alkaline electrolytes,comparable to that of the IrO_(2)∥Pt/C cell.The present study may pioneer a new avenue for developing novel bifunctional electrocatalysts with high-performance and low cost for water splitting.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51972346,51932011,52001029)the Hunan Natural Science Fund for Distinguished Young Scholar(Grant No.2021JJ10064)+1 种基金the Program of Youth Talent Support for Hunan Province(Grant No.2020RC3011)the Innovation-Driven Project of Central South University(Grant No.2020CX024).
文摘Rechargeable zinc-ion batteries employing a metallic zinc anode and aqueous electrolytes have received significant attention since they are safe,cost-effective,and environmentally friendly.Thanks to the intro-duction of orthophosphate ions,vanadium phosphates exhibit a higher working voltage as cathodes for zinc-ion batteries than other vanadium-based materials.However,due to the poor cycling stability and complex mechanism,stricter requirements are put forward on their manufacturing technique.Herein,a comprehensive review of the recent research progress in vanadium phosphate electrode materials is pre-sented,focusing on modification strategies based on different crystal structures and the energy storage behaviors of zinc ions in operation.Moreover,research directions and prospects are discussed.
基金supported by Taishan Scholar Program of Shandong Province,China(ts_(2)01712045)the Key Research and Development Program of Shandong Province(2018GGX104001,2019GGX102069)+1 种基金the Natural Science Foundation of Shandong Province of China(ZR2017MB054 and ZR2018BB008)2019 Research Funds(1.190002.01)of Ulsan National Institute of Science and Technology(UNIST).
文摘Developing a highly efficient and cost-effective electrocatalyst for catalyzing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is fundamentally important for the practical application of the overall water splitting technique.Herein,a bifunctional electrocatalyst constituted by FexNiy and CeO_(2) nanoparticles supported on the N-doped nanocarbon(NC)is fabricated by a simple one-pot pyrolysis of the homogeneous mixture of Fe,Ni,Ce nitrates and melamine.The synergistic effect of each component in the FexNiy/CeO_(2)/NC gives rise to outstanding electrocatalytic activities and stability toward the HER and OER.For hydrogen evolution,the FexNiy/CeO_(2)/NC shows a smaller overpotential of 260 mV to achieve a current density of 50 mA cm^(-2) in a 1 M KOH electrolyte.More significantly,a small overpotential of 240 mV for FexNiy/CeO_(2)/NC affords an oxygen evolution current density of 10 mA cm^(-2),far lower than that of the benchmark IrO_(2).The practicability and electrocatalytic activity of the prepared FexNiy/CeO_(2)/NC under practical operation conditions are also investigated.In particular,the FexNiy/CeO_(2)/NC-based overall water splitting cell only needs a cell voltage of 1.70 V to output 10 mA cm^(-2) in alkaline electrolytes,comparable to that of the IrO_(2)∥Pt/C cell.The present study may pioneer a new avenue for developing novel bifunctional electrocatalysts with high-performance and low cost for water splitting.
