Operando Identification of the Dynamic Behavior of Oxygen Vacancy-Rich Co3O4 for Oxygen Evolution Reaction

化学 析氧 电催化剂 X射线光电子能谱 氧气 价(化学) 循环伏安法 X射线吸收精细结构 介电谱 催化作用 电化学 氧化还原 氧气储存 空位缺陷 反应机理 无机化学 化学工程 光谱学 物理化学 结晶学 电极 有机化学 工程类 物理 量子力学
作者
Zhaohui Xiao,Yucheng Huang,Chung‐Li Dong,Chao Xie,Zhijuan Liu,Shiqian Du,Wei Chen,Dafeng Yan,Tao Li,Zhiwen Shu,Guanhua Zhang,Huigao Duan,Yanyong Wang,Yuqin Zou,Ru Chen,Shuangyin Wang
出处
期刊:Journal of the American Chemical Society [American Chemical Society]
卷期号:142 (28): 12087-12095 被引量:1074
标识
DOI:10.1021/jacs.0c00257
摘要

The exact role of a defect structure on transition metal compounds for electrocatalytic oxygen evolution reaction (OER), which is a very dynamic process, remains unclear. Studying the structure-activity relationship of defective electrocatalysts under operando conditions is crucial for understanding their intrinsic reaction mechanism and dynamic behavior of defect sites. Co3O4 with rich oxygen vacancy (VO) has been reported to efficiently catalyze OER. Herein, we constructed pure spinel Co3O4 and VO-rich Co3O4 as catalyst models to study the defect mechanism and investigate the dynamic behavior of defect sites during the electrocatalytic OER process by various operando characterizations. Operando electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) implied that the VO could facilitate the pre-oxidation of the low-valence Co (Co2+, part of which was induced by the VO to balance the charge) at a relatively lower applied potential. This observation confirmed that the VO could initialize the surface reconstruction of VO-Co3O4 prior to the occurrence of the OER process. The quasi-operando X-ray photoelectron spectroscopy (XPS) and operando X-ray absorption fine structure (XAFS) results further demonstrated the oxygen vacancies were filled with OH• first for VO-Co3O4 and facilitated pre-oxidation of low-valence Co and promoted reconstruction/deprotonation of intermediate Co-OOH•. This work provides insight into the defect mechanism in Co3O4 for OER in a dynamic way by observing the surface dynamic evolution process of defective electrocatalysts and identifying the real active sites during the electrocatalysis process. The current finding would motivate the community to focus more on the dynamic behavior of defect electrocatalysts.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
can完成签到,获得积分10
刚刚
zhongzihao完成签到,获得积分20
1秒前
小蘑菇应助MaYue采纳,获得10
1秒前
1秒前
孙福禄应助机智的然然采纳,获得10
1秒前
GooJohn发布了新的文献求助10
2秒前
NexusExplorer应助杜兰特工队采纳,获得10
3秒前
3秒前
3秒前
4秒前
FashionBoy应助鲤跃采纳,获得10
5秒前
阳光c完成签到 ,获得积分10
5秒前
威武的手链完成签到,获得积分20
6秒前
sxr完成签到,获得积分10
6秒前
zhongzihao发布了新的文献求助10
7秒前
7秒前
在水一方应助闪闪采纳,获得10
7秒前
Jay发布了新的文献求助10
8秒前
灰灰子发布了新的文献求助10
8秒前
量子星尘发布了新的文献求助10
9秒前
9秒前
小丑鱼儿发布了新的文献求助10
11秒前
XYN1发布了新的文献求助10
11秒前
14秒前
14秒前
LiuLiu完成签到,获得积分10
15秒前
樱桃小热巴完成签到 ,获得积分10
15秒前
16秒前
16秒前
不低头完成签到,获得积分10
16秒前
大鱼完成签到,获得积分10
17秒前
17秒前
XYN1完成签到,获得积分10
17秒前
MaYue发布了新的文献求助10
18秒前
18秒前
18秒前
闪闪发布了新的文献求助10
19秒前
尊敬依珊发布了新的文献求助10
20秒前
强强完成签到,获得积分10
21秒前
阿童木发布了新的文献求助10
23秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3988868
求助须知:如何正确求助?哪些是违规求助? 3531255
关于积分的说明 11253071
捐赠科研通 3269858
什么是DOI,文献DOI怎么找? 1804822
邀请新用户注册赠送积分活动 881994
科研通“疑难数据库(出版商)”最低求助积分说明 809035