Abstract
Constructing heterostructures has proved to be a successful strategy to fabricate electrocatalysts with high efficiency for water splitting.However,the structure evo-lution in alkaline hydrogen evolution reaction lacks investigation and the specific active center remains dis-putable.Herein,we take the well-designed Ni3S2@VO2 heterostructures as a model to investigate the electrocat-alytic activity and the surface reconstruction process of heterostructure catalysts in alkaline electrolyte.The Ni3S2@VO2 heterostructures,with Ni3S2 nanorods as the core and VO2 nanoflakes as the shell,coupled with the high conductive Ni3S2,the hydrophilic VO2 and modulated electronic structures at the interfaces,exhibited prominent activity and superior stability at various current densities.Further,the ex-situ characterizations confirmed that the surface reconstruction from Ni3S2@VO2 into Ni3S2@amorphous-Ni(OH)2 in alkaline media could opti-mize the water dissociation barrier and exposed large active area,thereby contributing to improved electrocatalytic performance.Our study not only introduces novel high-performance electrocatalysts for hydrogen evolution reaction(HER),but also provides a new avenue for re-examining hetero-structural catalysts in alkaline solutions.
基金项目
Basic and Applied Basic Research Project of Guangdong Province(2022A1515011438)
Basic and Applied Basic Research Project of Guangdong Province(2023A1515011055)
Key Project of Shenzhen Basic Research(JCYJ2022081800003006)
Basic Research Project of the Science and Technology Innovation Commission of Shenzhen(JCYJ20220531101013028)
Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials(ZDSYS20200421111401738)
中国博士后科学基金(2022M722168)
NETL
NSTL
万方数据