Developing efficient and stable electrocatalysts has always been the focus of electrochemical research.Here,sea urchin-like nickel-molybdenum bimetallic phosphide nickel-molybdenum alloy(Ni_(4)Mo)and(Ni-Mo-P)were succ...Developing efficient and stable electrocatalysts has always been the focus of electrochemical research.Here,sea urchin-like nickel-molybdenum bimetallic phosphide nickel-molybdenum alloy(Ni_(4)Mo)and(Ni-Mo-P)were successfully synthesized by hydrothermal,annealing and phosphating methods on nickel foam(NF).The unusual shape of the sea urchin facilitates gas release and mass transfer and increases the interaction between catalysts and electrolytes.The Ni_(4)Mo/NF and Ni-Mo-P/NF electrodes only need overpotentials of 72 and 197 mV to reach 50 mA·cm^(−2) under alkaline conditions for hydrogen evolution reaction and oxygen evolution reaction,respectively.The Ni_(4)Mo/NF and Ni-Mo-P/NF asymmetric electrodes were used as anode and cathode for the overall water splitting,respectively.In 1.0 M KOH,at a voltage of 1.485 V,the electrolytic device generated 50 mA·cm^(−2) current density,maintaining for 24 h without reduction.The labor presents a simple method to synthesize a highly active,low-cost,and strongly durable self-supporting electrode for over-water splitting.展开更多
Inducing microstrain at atomic level within multicomponent Pt-based electrocatalysts,as well as the role of this microstrain in modulating the electronic structure and multi-site surface adsorption energies during hyd...Inducing microstrain at atomic level within multicomponent Pt-based electrocatalysts,as well as the role of this microstrain in modulating the electronic structure and multi-site surface adsorption energies during hydrogen evolution reaction(HER),still remains unexplored.Herein,the localized microstrain had been designed in a novel kind of ultrafine PtMnZn ternary alloy,which were planted into the highly ordered TiO_(2) nanotube array to form the self-supported electrode with highly catalytic activity for splitting water both in acid and alkaline conditions.The obtained selfsupported electrode exhibits a remarkable mass activity of 17.73 A·mg_(Pt)^(−1) in acid and 6.78 A·mg_(Pt)^(−1) in alkaline conditions,outperforming commercial Pt/C 44.32 and 61.64 times,respectively.In addition,the obtained self-electrodes possess superior long-term durability.Theoretical investigations reveal that the modulated electronic structure can shift the d-band center of multi metallic sites,resulting in lower|ΔG ^(*)H|of H adsorption on PtMnZn surface,as well as lower energy barrier to dissociate the H_(2)O affording ^(*)H intermediates providing an acid microenvoirnment,which facilitates the H_(2) formation in alkaline conditions.This work induces distinct local microstrain in self-supported electrode,realizing optimized adsorption and enhancing electrochemical performances,which offers a promising strategy for designing novel high-performance self-supported electrode for hydrogen production.展开更多
基金supported by the Natural Science Research Project of Jiangsu Higher Education Institutions(No.23KJD150005)the Scientific Research Project of Nanjing Xiaozhuang University(No.2022NXY29).
文摘Developing efficient and stable electrocatalysts has always been the focus of electrochemical research.Here,sea urchin-like nickel-molybdenum bimetallic phosphide nickel-molybdenum alloy(Ni_(4)Mo)and(Ni-Mo-P)were successfully synthesized by hydrothermal,annealing and phosphating methods on nickel foam(NF).The unusual shape of the sea urchin facilitates gas release and mass transfer and increases the interaction between catalysts and electrolytes.The Ni_(4)Mo/NF and Ni-Mo-P/NF electrodes only need overpotentials of 72 and 197 mV to reach 50 mA·cm^(−2) under alkaline conditions for hydrogen evolution reaction and oxygen evolution reaction,respectively.The Ni_(4)Mo/NF and Ni-Mo-P/NF asymmetric electrodes were used as anode and cathode for the overall water splitting,respectively.In 1.0 M KOH,at a voltage of 1.485 V,the electrolytic device generated 50 mA·cm^(−2) current density,maintaining for 24 h without reduction.The labor presents a simple method to synthesize a highly active,low-cost,and strongly durable self-supporting electrode for over-water splitting.
基金supported by Beijing Municipal Commission of Education(No.KZ202210005003)Beijing Natural Science Foundation(No.Z210016)+1 种基金the National Key Research and Development Program of China(No.2022YFB3705403)the National Natural Science Foundation of China(No.22302211).
文摘Inducing microstrain at atomic level within multicomponent Pt-based electrocatalysts,as well as the role of this microstrain in modulating the electronic structure and multi-site surface adsorption energies during hydrogen evolution reaction(HER),still remains unexplored.Herein,the localized microstrain had been designed in a novel kind of ultrafine PtMnZn ternary alloy,which were planted into the highly ordered TiO_(2) nanotube array to form the self-supported electrode with highly catalytic activity for splitting water both in acid and alkaline conditions.The obtained selfsupported electrode exhibits a remarkable mass activity of 17.73 A·mg_(Pt)^(−1) in acid and 6.78 A·mg_(Pt)^(−1) in alkaline conditions,outperforming commercial Pt/C 44.32 and 61.64 times,respectively.In addition,the obtained self-electrodes possess superior long-term durability.Theoretical investigations reveal that the modulated electronic structure can shift the d-band center of multi metallic sites,resulting in lower|ΔG ^(*)H|of H adsorption on PtMnZn surface,as well as lower energy barrier to dissociate the H_(2)O affording ^(*)H intermediates providing an acid microenvoirnment,which facilitates the H_(2) formation in alkaline conditions.This work induces distinct local microstrain in self-supported electrode,realizing optimized adsorption and enhancing electrochemical performances,which offers a promising strategy for designing novel high-performance self-supported electrode for hydrogen production.
