摘要
Despite the tremendous efforts devoted to enhancing the activity of oxygen evolution reaction(OER)catalysts,there is still a huge challenge to deeply understand the electronic structure characteristics of transition metal oxide to guide the design of more active catalysts.Herein,Fe_(3)O_(4)with oxygen vacancies(Fe_(3)O_(4)-Vac)was synthesized via Ar ion irradiation method and its OER activity was greatly improved by properly modulating the electron density around Fe atoms.The electron density of Fe_(3)O_(4)-Vac around Fe atoms increased compared to that of Fe_(3)O_(4)according to the characterization of synchrotron-based X-ray absorption near-edge structure(XANES),extended X-ray absorption fine structure(EXAFS)spectra,and density functional theory(DFT)calculation.Moreover,the DFT results indicate the enhancement of the desorption of HOO^(*)groups which significantly reduced the OER reaction barrier.Fe_(3)O_(4)-Vac catalyst shows an overpotential of 353 m V,lower than that of Fe OOH(853 m V)and Fe_(3)O_(4)(415 m V)at 10 m A cm^(-2),and a low Tafel slope of 50 m V dec^(-1)in 1 M KOH,which was even better than commercial RuO_(2)at high potential.This modulation approach provides us with valuable insights for exploring efficient and robust water-splitting electrocatalysts.
基金
financially supported by the National Natural Science Foundation of China(U1867215,11722543,11875211,U1932134)
Suzhou Key Industrial Technology Innovation project(SYG201828)
Hubei Provincial Natural Science Foundation(2019CFA036)
the Fundamental Research Funds for the Central Universities(2042020kf0211)
作者简介
Dong He,Dr.,E-mail:hedong@whu.edu.cn;Li Cheng,Dr.,E-mail:lcheng@whu.edu.cn;Xiangheng Xiao,Prof.E-mail:xxh@whu.edu.cn;Chongyang Tang,Dr;Jiangchao Liu,Dr;Hongbo Wang,Dr;Wenqing Li,Prof;Changzhong Jiang,Prof.
