期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 8, 页码 7079-7086出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b18208
关键词
cobalt oxide; high-index facets; oxygen vacancy; oxygen evolution reaction
资金
- National Natural Science Foundation of China [51672229]
- Environment and Conservation Fund of Hong Kong SAR, China [ECF 2016-85]
- General Research Fund [CityU 11213115]
- Theme-based Research Scheme of the Research Grants Council of Hong Kong SAR, China [T42-103/16-N]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20160229165240684]
- Shenzhen Research Institute, City University of Hong Kong
Because of sluggish kinetics of the oxygen evolution reaction (OER), designing low-cost, highly active, and stable electrocatalysts for OER is important for the development of sustainable electrochemical water splitting. Here, {112} high-index facet exposed porous Co3O4 nano sheets with oxygen vacancies on the surface have been successfully synthesized via a simple hydrothermal method followed by NaBH4 reduction. As compared with the pristine and other faceted porous Co3O4 nanosheets (e.g., {110} and {111}), the as-prepared {112} faceted porous nanosheets exhibit a much lower overpotential of 318 mV at a current density of 10 mA cm(-2). Importantly, these nanosheets also give excellent electrochemical stability, displaying an insignificant change in the required overpotential at a current density of 10 mA cm(-2) even after a 14 h long-term test. All these superior OER activity and stability could be attributed to their unique hierarchical structures assembled by ultrathin porous nanosheets, {112} high-index exposed facets with higher ratio of Co2+/Co3+ and oxygen vacancies on the surface, which can substantially enhance the charge transfer rate and increase the number of active sites. All these findings not only demonstrate the potency of our Co3O4 nanosheets for efficient water oxidation but also provide further insights into developing cost-effective and high-performance catalysts for electrochemical applications.
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