期刊
JOURNAL OF CATALYSIS
卷 352, 期 -, 页码 246-255出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2017.05.020
关键词
Water oxidation; Copper-doped cobalt oxide; Metal-organic framework; Electrocatalysis; Photocatalysis
资金
- National Natural Science Foundation of China [21173105]
- Fundamental Research Funds for the Central Universities [lzujbky-2016-k08]
Cobalt oxides have been modified with Cu using different methods to obtain the catalysts of Cu-ZIF-400 (copper-doped cobalt oxide), CuO/Co3O4 and Co3O4 with identical morphology of hollow polyhedral nanocages. These catalysts were investigated simultaneously for electrocatalytic and photocatalytic water oxidation for the first time. Among them, Cu-ZIF-400 can act as the best electrochemical water oxidation catalyst with a low oxygen evolution reaction (OER) overpotential of 342 mV at 10.0 mA cm(-2) in alkaline electrolyte. At the same time, a high turnover frequency (TOF) of 2.1 x 10(-3) s(-1) per metal atom was obtained over Cu-ZIF-400 at neutral conditions, which is comparable to those documented cobalt based catalysts. The different performances of catalysts can be attributed to the different doping methods. We hypothesize that the electrophilic Cu2+ makes the Co more electron-drawing and facilitates the nucleophilic addition of water, which enhanced OER activity of Cu-ZIF-400 catalyst. (C) 2017 Elsevier Inc. All rights reserved.
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