期刊
CHEMICAL ENGINEERING JOURNAL
卷 390, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124591
关键词
Oxygen evolution reaction; Hydrogen evolution reaction; Water splitting; Epitaxial growth; DFT calculations
资金
- National Natural Science Foundation of China [51772089, 21872046, 51902100]
- Outstanding Youth Scientist Foundation of Hunan Province [2018JJ1009]
- Youth 1000 Talent Program of China
- Science and Technology Innovation Platform and Talent Plan of Hunan Province [2017XK2023]
- Research and Development Plan of Key Areas in Hunan Province [2019GK2235]
- China Postdoctoral Science Foundation [2018M642971]
- Youth Scientist Foundation of Hunan Province [2019JJ50087]
- National Key R&D Program of China [2017YFA0403402]
Highly efficient and cost-effective electrocatalysts towards both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are critical for the large-scale and environmental-friendly hydrogen production. Here we report the facile synthesis of a novel bifunctional catalyst, mesoporous Co3O4 with surface decorated epitaxial S-doped CoO layers (S-CoO/Co3O4), via a simple solution-combustion and thioacetamide-sulfidation method. S-CoO/Co3O4 shows excellent electrochemical catalytic activity and stability in 1 M KOH with small overpotentials of 275 mV for OER and 181 mV for HER at 10 mA cm(-2) on a rotating disk electrode. Moreover, when loaded on nickel foam and used as both cathode and anode for overall water splitting, the current density reaches 10 mA cm(-2) at a relatively low voltage of 1.60 V and degrades for only similar to 5.7% after 20 h operation. The excellent electrochemical performance is mainly attributed to the highly active surface S-doped CoO species, which also acts as the protective buffer layer for the inner bulk phase and results in enhanced stability. Density functional theory calculations show that the S-doping in CoO and Co3O4 can accelerate the carrier transport, promoting the overall electronic conductivity and electrochemical catalytic activity.
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