Vacancies and interfaces engineering of core-shell heterostuctured NiCoP/NiO as trifunctional electrocatalysts for overall water splitting and zinc-air batteries

卷:8

Article

关键词: HIGHLY EFFICIENT;    OXYGEN;    NANOSHEETS;    OXIDATION;    ALLOY;   

DOI  :  10.1016/j.gee.2021.11.003

来源: SCIE

【 摘 要 】

The electronic structures and properties of electrocatalysts, which depend on the physicochemical structure and metallic element compo-nents, could significantly affect their electrocatalytic performance and their future applications in Zn-air battery (ZAB) and overall water splitting (OWS). Here, by combining vacancies and heterogeneous interfacial engineering, three-dimensional (3D) core-shell NiCoP/NiO heterostructures with dominated oxygen vacancies have been controllably in-situ grown on carbon cloth for using as highly efficient electro-catalysts toward hydrogen and oxygen electrochemical reactions. Theoretical calculation and electrochemical results manifest that the hy-bridization of NiCoP core with NiO shell produces a strong synergistic electronic coupling effect. The oxygen vacancy can enable the emergence of new electronic states within the band gap, crossing the Fermi levels of the two spin components and optimizing the local electronic structure. Besides, the hierarchical core-shell NiCoP/NiO nanoarrays also endow the catalysts with multiple exposed active sites, faster mass transfer behavior, optimized electronic strutures and improved electrochemical performance during ZAB and OWS applications.(c) 2021 Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communi-cations Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).