期刊
NANOTECHNOLOGY
卷 31, 期 47, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6528/abaf80
关键词
oxygen evolution reaction; Ag nanoparticles; cobalt carbonate hydroxide; surface self-reconstruction; proton-coupled electron transfer
资金
- National Science Foundations of China [21673108, 21335004]
- Open Foundations of State Key Laboratory of Coordination Chemistry [SKLCC1917]
Herein, a novel composite of small amounts of Ag nanoparticles (NPs) decorated urchin-like cobalt carbonate hydroxide hydrate (CCHH) was developed for highly-efficient alkaline oxygen evolution reaction (OER). Not only can Ag colloids, as template agents, modify the morphologies of urchin-like CCHH microspheres to expose more active sites available, but also the supported Ag NPs formed by Ag colloids can transfer the electron to CCHH surfaces, accelerating the transformation of surface Co(II)to Co-III/Co-IV(proton-coupled electron transfer (PCET) process). The urchin-like Ag/CCHH (0.013 mmol) precatalyst (before cyclic voltammetry (CV) activation) exhibits a better OER performance (a low overpotential of 273 mV at 10 mA cm(-2)and small Tafel slope of 65 mV dec(-1)) as compared with commercial RuO2. Furthermore, the dynamic surface self-reconstruction (surface CO(3)(2-)and OH(-)exchange) can further enhance the activities of Ag/CCHH precatalysts. Consequently, the optimal Ag/CCHH (0.013 mmol) catalyst presents a superior activity (a lower overpotential of 267 mV at 10 mA cm(-2)and markedly reduced Tafel slope to 56 mV dec(-1)) along with an excellent stability after CV cycles. The study provides a feasible strategy to fully realize the low overpotential of CCHH-based OER electrocatalysts.
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