Heterogeneous bimetallic oxides/phosphides nanorod with upshifted d band center for efficient overall water splitting  

作　　者：Ji Chen Yifan Zhao Shuwen Zhao Hua Zhang Youyu Long Lingfeng Yang Min Xi Zitao Ni Yao Zhou Anran Chen 

机构地区：[1]School of Materials and Energy,Yunnan University,Kunming 650091,China [2]School of Engineering,The University of Edinburgh,South Bridge,Edinburgh EH89YL,United Kingdom [3]Electron Microscopy Center,Yunnan University,Kunming 650091,China [4]School of Internet of Things Engineering,Jiangnan University,Wuxi 214122,China

出　　处：《Chinese Chemical Letters》2024年第9期414-420,共7页中国化学快报（英文版）

基　　金：financially supported by Yunnan Applied Basic Research Projects(Nos.202001BB050006,202201AT070095);Scientific Research Fund Project of Yunnan Provincial Department of Education(No.2023Y0262);Education Reform Research Project of Yunnan University(No.2021Z06)。

摘　　要：Electrocatalytic water splitting is the most directly available route to generate renewable and sustainable hydrogen.Here,we report the design of a composite material in which arrays of square pillar-like NiMoO4nanorods coated with N,P-doped carbon layers are uniformly contained in numerous nested nanoparticle structures.The catalysts have superior catalytic activity,requiring only 59 mV and 187 mV for HER and OER to attain a current density of 10 mA/cm^(2),respectively.The assembled two-electrode electrolytic cell required a voltage of 1.48 V to reach 10 mA/cm^(2),along with excellent long-term stability.Theoretical calculations reveal that electrons aggregate and redistribute at the heterogeneous interface,with the d-band centers of the Ni and Fe atoms being positively shifted compared to the Fermi level,effectively optimizing the adsorption of intermediates and reducing the Gibbs free energy,thus accelerating the catalytic process.Meanwhile,an integrated solar-driven water-splitting system demonstrated a high and stable solar-to-hydrogen efficiency of 18.20%.This work provides new possibilities for developing non-precious metal-based bifunctional electrocatalysts for large-scale water splitting applications.

关 键 词：Hydrogen evolution reaction Bimetallic oxides Bimetallic phosphides Overall water splitting Solar-to-hydrogen efficiency 

分 类 号：TQ116.21[化学工程—无机化工] O643.36[理学—物理化学]