Developing hierarchical heterostructures as bifunctional electrocatalysts which promote renewable hydrogen production is a desirable but challenging technology in electrochemical water splitting.Herein,the interface e...Developing hierarchical heterostructures as bifunctional electrocatalysts which promote renewable hydrogen production is a desirable but challenging technology in electrochemical water splitting.Herein,the interface engineering of the FeNi_(2)Se_(4)-FeNi LDH composite is achieved by the in situ growth of FeNi LDH nanosheets and the subsequent partial selenization treatment.Enhanced mass transfer and accelerated gas release are achieved in such a unique self-supported hierarchical heterostructure during overall water splitting.Moreover,the strong electronic interaction between FeNi_(2)Se_(4) and FeNi LDH optimizes the electron redistribution of Fe and Ni sites,which significantly improves the interfacial reactivity of reactants and/or intermediates with the hybrid catalyst.Benefiting from increased active sites and enhanced intrinsic activity,the hybrid electrocatalyst requires only a potential of 205 mV for the oxygen evolution reaction(OER)and a potential of 106 mV for the hydrogen evolution reaction(HER)to realize 10 mA cm^(−2).Specifically,the optimized FeNi_(2)Se_(4)-FeNi LDH as a bifunctional electrode in overall water splitting delivers 10 mA cm^(−2) at a low cell voltage of 1.56 V driven by a solar cell.This strategy by rational design of heterostructures thus paves an efficient pathway to fabricate active and non-precious bifunctional electrocatalysts for overall water splitting.展开更多
基金supported by the National Natural Science Foundation of China(51871119 and 22075141)High-Level Entrepreneurial and Innovative Talents Program on Jiangsu Province,Jiangsu Provincial Founds for Natural Science Foundation(BK20180015)+1 种基金China Postdoctoral Science Foundation(2018M640481 and 2019T120426)Jiangsu Postdoctoral Research Fund(2019K003).
文摘Developing hierarchical heterostructures as bifunctional electrocatalysts which promote renewable hydrogen production is a desirable but challenging technology in electrochemical water splitting.Herein,the interface engineering of the FeNi_(2)Se_(4)-FeNi LDH composite is achieved by the in situ growth of FeNi LDH nanosheets and the subsequent partial selenization treatment.Enhanced mass transfer and accelerated gas release are achieved in such a unique self-supported hierarchical heterostructure during overall water splitting.Moreover,the strong electronic interaction between FeNi_(2)Se_(4) and FeNi LDH optimizes the electron redistribution of Fe and Ni sites,which significantly improves the interfacial reactivity of reactants and/or intermediates with the hybrid catalyst.Benefiting from increased active sites and enhanced intrinsic activity,the hybrid electrocatalyst requires only a potential of 205 mV for the oxygen evolution reaction(OER)and a potential of 106 mV for the hydrogen evolution reaction(HER)to realize 10 mA cm^(−2).Specifically,the optimized FeNi_(2)Se_(4)-FeNi LDH as a bifunctional electrode in overall water splitting delivers 10 mA cm^(−2) at a low cell voltage of 1.56 V driven by a solar cell.This strategy by rational design of heterostructures thus paves an efficient pathway to fabricate active and non-precious bifunctional electrocatalysts for overall water splitting.
