期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 6, 页码 5381-5387出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00701
关键词
cobalt vanadate; oxygen evolution reaction; electrocatalysis; etching; postcatalytic analysis; surface reconstruction
资金
- DST, India [DST/TMD/MES/2K17/70]
- UGC
- CSIR
The factors contributing to the superior phase-dependent electrocatalytic OER activity of crystalline Co-vanadates were investigated. It was found that etching of vanadate from the precatalyst during electrochemical activation significantly contributes to the increased catalytic activity. Co-vanadates with polymeric vanadates showed better performance than monomeric orthovanadates due to higher vanadate etching, highlighting the importance of surface reconstruction in exposing more catalytically active sites.
Underlying factors responsible for superior phase-dependent electrocatalytic OER activity of crystalline Co-vanadates are investigated. Previous reports on Co-vanadates ascribed activity differences to optimal metal-oxygen bond strength. In contrast, we found etching of vanadate from precatalyst during electrochemical activation to be the primary contributor. The resulting higher surface reconstruction exposes a higher number of catalytically active cobalt sites that otherwise lay inactive due to their position in bulk. Co-vanadates with polymeric vanadates (CoV2O6) showed better OER over monomeric orthovana-dates (Co3V2O8) due to higher vanadate etching. Further, this work validates that etching can happen even from lattice positions, where bonding between constituents is strong.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据