Unveiling the superior oxygen evolution reaction performance ofβ-CoMoO_(4)nanorods:Insights into catalytic mechanisms and active site dynamics  

作　　者：Xinyu Zhong Yu Chen Tao Gan Yuying Huang Jiong Li Shuo Zhang 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [2]Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nano Research》2025年第3期194-203,共10页纳米研究(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22375333,12475331 and 22209198);CAS Project for Young Scientists in Basic Research(No.YSBR-051);the CAS Youth Interdisciplinary Team;This work was also supported by the User Experiment Assist System of SSRF.

摘　　要：Cobalt-based oxides are renowned for their excellent activity in the oxygen evolution reaction(OER),making them promising alternatives to precious metal catalysts.Among these,β-CoMoO_(4),with its wolframite structure,exhibits superior OER performance compared to widely studied cobalt-based perovskite oxides.However,its underlying catalytic mechanism remains largely unexplored.In this study,we synthesizedβ-CoMoO_(4)using a hydrothermal method and achieved remarkable OER catalytic performance in an alkaline environment,with an overpotential of 366 mV at a current density of 10 mA/cm^(2) and an intrinsic activity of 180μA/cm_(ox)^(2) at 1.55 V(vs.reversible hydrogen electrode(RHE)).Following OER activation,the micron-sized rod-like structure of β-CoMoO_(4)dissociates as a whole and reconstructs into amorphous CoOOH,forming a hexagonal flake structure on the scale of hundreds of nanometers.This transformation provides abundant surface active sites with a low-coordination structure.By combining in situ X-ray absorption fine structure(XAFS)with cyclic voltammetry(CV)scanning,we investigated the kinetic behavior of the active sites ofβ-CoMoO_(4)as a function of potential.The results indicate that the Co ions in this low-coordination structure can be pre-oxidized at relatively low voltages.Therefore,the excellent OER performance of β-CoMoO_(4)is attributed to its unique bulk-phase reconstruction behavior and the strong deprotonation ability of the in situ generated amorphous low-coordination active structure.Our research provides valuable insights for the development of new and efficient cobalt-based oxide electrocatalysts for water-splitting applications.

关 键 词：synchrotron radiation X-ray absorption fine structure oxygen evolution reaction DYNAMICS 

分 类 号：O64[理学—物理化学]