Unveiling the role of Ni in Ru-Ni oxide for oxygen evolution: Lattice oxygen participation enhanced by structural distortion  

作　　者：Young-Jin Ko Man Ho Han Chulwan Lim Seung-Ho Yu Chang Hyuck Choi Byoung Koun Min Jae-Young Choi Woong Hee Lee Hyung-Suk Oh 

机构地区：[1]Clean Energy Research Center,Korea Institute of Science and Technology(KIST),Hwarang-ro 14-gil 5,Seongbuk-gu,Seoul 02792,Republic of Korea [2]Department of Chemical and Biological Engineering,Korea University,145,Anam-ro,Seongbuk-gu,Seoul 02841,Republic of Korea [3]Department of Chemistry,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea [4]National Agenda Research Division,Korea Institute of Science and Technology(KIST),Hwarang-ro 14-gil 5,Seonbuk-gu,Seoul 02792,Republic of Korea [5]Graduate School of Energy and Environment(KU-KIST Green School),Korea University,145 Anam-ro,Seongbuk-gu,Seoul 02841,Republic of Korea [6]School of Advanced Materials Science&Engineering,Sungkyunkwan University(SKKU),Suwon 16419,Republic of Korea [7]KIST-SKKU Carbon-Neutral Research Center,Sungkyunkwan University(SKKU),Suwon 16419,Republic of Korea

出　　处：《Journal of Energy Chemistry》2023年第2期54-61,I0003,共9页能源化学（英文版）

基　　金：supported by institutional program grants from the Korea Institute of Science and Technology and Korea Institute of Energy Technology Evaluation and Planning(KETEP)granted financial resource from the Ministry of Trade,Industry&Energy,Republic of Korea(No.20224C10300020);“Carbon to X Project”(2020M3H7A1098229)through the National Research Foundation(NRF)funded by the Ministry of Science and ICT,Republic of Korea;supported by the National Research Council of Science&Technology(NST)grant by the Korean government(MSIT)(No.CAP21011-100);National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(NRF-2021R1A2C2093467)。

摘　　要：Introducing Ni in Ru oxide is a promising approach to enhance the catalytic activity for the oxygen evolution reaction(OER).However,the role of Ni(which has a poor intrinsic activity)is not fully understood.Here,a Ru NiO_(x)electrode fabricated via a modified dip coating method exhibited excellent OER performance in acidic media,and neutral media for CO_(2)reduction reaction.We combined in-situ/operando X-ray absorption near-edge structure and on-line inductively coupled plasma mass spectrometry studies to unveil the role of the Ni introduced in the Ru oxide.We propose that the Ni not only transforms the electronic structure of the Ru oxide,but also produces a large number of oxygen vacancies by distorting the oxygen lattice structure at low overpotentials,increasing the participation of lattice oxygen for OER.This work demonstrates the real behavior of bimetallic oxide materials under applied potentials and provides new insights into the development of efficient electrocatalysts.

关 键 词：Oxygen evolution reaction Ru electrode Ni electrode Oxygen vacancies In-situ/Operando studies 

分 类 号：O643.36[理学—物理化学]