Abstract
Although considerable research efforts have been devoted to the design and development of non-noble electrocatalysts for oxygen evolution reaction(OER),substantial enhancement of OER performance with commercial-scale water electrolysis remains a big challenge.This could result from the difficulties in detecting the intrinsic properties and overlooking the assembly process for electrochemical OER pro-cess.Here,we employ a microjet collision method to investigate the intrinsic OER activities of individ-ual NiZnFeOx entities with and without a moderate magnetic field.Our results demonstrate that single NiZnFeOx nanoparticles(NPs)show the excellent OER performance with a lowest onset potential(～1.35V vs.RHE)and a greatest magnetic enhancement(～118％)among bulk materials,single agglomerations and NPs.Furthermore,we explore the utility of theoretical investigation by density functional theory(DFT)calculations for studying OER process on NiZnFeOx surfaces without and with spin alignment,indicating monodispersed NiZnFeOx NPs with totally spin alignment facilitates the OER process under the external magnetic field.It is found that the well-dispersion of NiZnFeOx NPs would increase the electrical conduc-tivity and the surface spin state,resulting in promoting their OER activities.This work provides a test for uncovering the essential roles of NPs assembly to a significant promotion of their magnet-assisted OER.
基金项目
Major Research Project(92061108)
国家自然科学基金(22272052)
Shanghai Municipal Science and Technology Major Project(2018SHZDZX03)
Xiamen University Opening Project of PCOSS(201901)
YONGJIANG Talent Introduction Programme(2021A-115-G)
NETL
NSTL
万方数据