Unveiling the intrinsic properties of single NiZnFeO_x entity for promoting electrocatalytic oxygen evolution

作     者：Zhihao Gu Jiabo Le Hehe Wei Zehui Sun Mahmoud Elsayed Hafez Wei Ma Zhihao Gu;Jiabo Le;Hehe Wei;Zehui Sun;Mahmoud Elsayed Hafez;Wei Ma

作者机构：Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular EngineeringFeringa Nobel Prize Scientist Joint Research CenterFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Department of ChemistryFaculty of ScienceBeni-Suef UniversityBeni-Suef 62511Egypt 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2024年第35卷第4期

页      面：181-186页

核心收录：

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Major Research Project (No.92061108) the National Natural Science Foundation of China (No.22272052) Shanghai Municipal Science and Technology Major Project (No.2018SHZDZX03) Xiamen University Opening Project of PCOSS (No.201901) Yongjiang Talent Introduction Programme(No.2021A-115-G) 

主　　题：Single entity OER Magnetic enhancement Electrocatalysis Well-dispersion 

摘      要：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 process. Here, we employ a microjet collision method to investigate the intrinsic OER activities of individual NiZnFeO_x entities with and without a moderate magnetic field. Our results demonstrate that single NiZnFeO_x nanoparticles(NPs) show the excellent OER performance with a lowest onset potential(~1.35 V 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 NiZnFeO_x surfaces without and with spin alignment, indicating monodispersed NiZnFeO_xNPs with totally spin alignment facilitates the OER process under the external magnetic field. It is found that the well-dispersion of NiZnFeO_x NPs would increase the electrical conductivity 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.