The rational construction of heterogeneous interfacial engineering presents a critical strategy for advancing efficient electrochemical water-splitting development.Here,a bimetallic sulfide-coupled MoNi alloy heterost...The rational construction of heterogeneous interfacial engineering presents a critical strategy for advancing efficient electrochemical water-splitting development.Here,a bimetallic sulfide-coupled MoNi alloy heterostructure catalyst(VMoS/MoNi)is synthesized via hydrothermal and sulfidation methods for high-performance alkaline water electrolysis.Benefiting from interfacial coupling within the VMoS/MoNi catalyst,the active sites are enriched,and electron transfer is promoted,leading to enhanced synergy and collaboration in electrocatalytic reactions.As a result,at 10 mA·cm^(-2),the VMoS/MoNi catalyst demonstrates excellent HER(26 mV)and OER(223 mV)performance.VMoS/MoNi catalysts used as double electrode in an alkaline electrolytic assembly are noteworthy for achieving a cell voltage of 1.56 V at 10 mA·cm^(-2),a significant improvement above most previously reported bifunctional electrocatalysts.This result provides further momentum for the design of heterostructure electrocatalysts,advancing the study of renewable energy conversion and storage.展开更多
Developing highly active and cost-effective catalysts for the hydrogen evolution reaction(HER) is crucial for alkaline water electrolysis,but it remains a significant challenge.Herein,nickel(Ni) nanoparticles composit...Developing highly active and cost-effective catalysts for the hydrogen evolution reaction(HER) is crucial for alkaline water electrolysis,but it remains a significant challenge.Herein,nickel(Ni) nanoparticles composite partially confined in molybdenum dioxide(MoO_(2)) lattices was developed via a facile strong metal-support interaction(SMSI) tuning strategy.Experimental analyses revealed that the regulation of the electronic structure of Ni@MoO_(2) by SMSI significantly alleviated the work function of Ni@MoO_(2),accelerating electron transfer and optimizing adsorption of hydrogen intermediates,thereby boosting the HER activity.The optimized Ni@MoO_(2) catalyst exhibited an overpotential of only 18 and 30 mV to reach a current density of 10 mA cm^(-2),in alkaline freshwater and seawater,respectively,surpassing the commercial Pt/C catalysts.A two-electrode system with Ni@MoO_(2) as a cathode required a voltage of 1.46 V to attain the current density of 10 mA cm^(-2),with no performance degradation after 500 h.This two-electrode configuration exhibited a solar-to-hydrogen conversion efficiency of up to 20.10% when used in constructing a solar-powered water electrolysis electrolyzer.This study provides a promising strategy for designing stable and efficient catalysts for industrial hydrogen production.展开更多
基金supported by the National Natural Science Foundation of China(No.22369025)Yunnan Applied Basic Research Projects(Nos.202201AT070095,202301AT070098,202301AT070107,202401AT070438,and 202401AT070433)+2 种基金Education Reform Research Project of Yunnan University(No.2021Z06)Yunnan University Graduate Student Practice and Innovation Program(Nos.ZC-23234269,ZC-23235291,KC-23236398,and KC-23234063)Yunnan Revitalization Talent Support Program。
文摘The rational construction of heterogeneous interfacial engineering presents a critical strategy for advancing efficient electrochemical water-splitting development.Here,a bimetallic sulfide-coupled MoNi alloy heterostructure catalyst(VMoS/MoNi)is synthesized via hydrothermal and sulfidation methods for high-performance alkaline water electrolysis.Benefiting from interfacial coupling within the VMoS/MoNi catalyst,the active sites are enriched,and electron transfer is promoted,leading to enhanced synergy and collaboration in electrocatalytic reactions.As a result,at 10 mA·cm^(-2),the VMoS/MoNi catalyst demonstrates excellent HER(26 mV)and OER(223 mV)performance.VMoS/MoNi catalysts used as double electrode in an alkaline electrolytic assembly are noteworthy for achieving a cell voltage of 1.56 V at 10 mA·cm^(-2),a significant improvement above most previously reported bifunctional electrocatalysts.This result provides further momentum for the design of heterostructure electrocatalysts,advancing the study of renewable energy conversion and storage.
基金financially supported by the National Natural Science Foundation of China(No.22369025)Yunnan Applied Basic Research Projects(Nos.202201AT070095,202301AT070098,202301AT070107,202401AT070438,and 202401AT070433)+2 种基金the Education Reform Research Project of Yunnan University(No.2021Z06)Yunnan Provincial University Service Key Industry Science and Technology Program(No.FWCYBSPY2024021)Yunnan Revitalization Talent Support Program
文摘Developing highly active and cost-effective catalysts for the hydrogen evolution reaction(HER) is crucial for alkaline water electrolysis,but it remains a significant challenge.Herein,nickel(Ni) nanoparticles composite partially confined in molybdenum dioxide(MoO_(2)) lattices was developed via a facile strong metal-support interaction(SMSI) tuning strategy.Experimental analyses revealed that the regulation of the electronic structure of Ni@MoO_(2) by SMSI significantly alleviated the work function of Ni@MoO_(2),accelerating electron transfer and optimizing adsorption of hydrogen intermediates,thereby boosting the HER activity.The optimized Ni@MoO_(2) catalyst exhibited an overpotential of only 18 and 30 mV to reach a current density of 10 mA cm^(-2),in alkaline freshwater and seawater,respectively,surpassing the commercial Pt/C catalysts.A two-electrode system with Ni@MoO_(2) as a cathode required a voltage of 1.46 V to attain the current density of 10 mA cm^(-2),with no performance degradation after 500 h.This two-electrode configuration exhibited a solar-to-hydrogen conversion efficiency of up to 20.10% when used in constructing a solar-powered water electrolysis electrolyzer.This study provides a promising strategy for designing stable and efficient catalysts for industrial hydrogen production.
