期刊
ACS NANO
卷 10, 期 12, 页码 11337-11343出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b06580
关键词
hydrogen evolution reaction; molybdenum carbide; three-dimensional hierarchical structure; hybrid electrocatalyst; polydopamine
类别
资金
- National Natural Science Foundation of China [51472173, 51522208]
- Natural Science Foundation of Jiangsu Province [BK20140302, SBK2015010320]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Collaborative Innovation Center of Suzhou Nano Science and Technology
The development of nonprecious metal based electro-catalysts for hydrogen evolution reaction (HER) has received increasing attention over recent years. Previous studies have established Mo2C as a promising candidate. Nevertheless, its preparation requires high reaction temperature, which more than often causes particle sintering and results in low surface areas. In this study, we show supporting Mo2C nanoparticles on the three-dimensional scaffold as a possible solution to this challenge and develop a facile two-step preparation method for similar to 3 nm Mo2C nanoparticles uniformly dispersed on carbon microflowers (Mo2C/NCF) via the self-polymerization of dopamine. The resulting hybrid material possesses large surface areas and a fully open and accessible structure with hierarchical order at different levels. MoO42- was found to play an important role in inducing the formation of this morphology presumably via its strong chelating interaction with the catechol groups of dopamine. Our electrochemical evaluation demonstrates that Mo2C/NCF exhibits excellent HER electrocatalytic performance with low onset overpotentials, small Tafel slopes, and excellent cycling stability in both acidic and alkaline solutions.
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