期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 10, 页码 4879-4885出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta10758c
关键词
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资金
- National Natural Science Foundation [21306060, 21573083]
- Program for New Century Excellent Talents in Universities of China [NCET-13-0237]
- Doctoral Fund of Ministry of Education of China [20130142120039]
- 1000 Young Talents program
- Huazhong University of Science and Technology (HUST)
In order to explore low-cost, high efficiency, precious metal-free materials for electrochemical water splitting, three types of molybdenum-based compounds (MoO2, MoC and Mo2C) were synthesized by tuning the ratio of glucose and ammonium molybdate via a two-step procedure. TEM images reveal a uniform dispersion of the three molybdenum-based nanoparticles on the carbon support, and in particular, MoC and Mo2C exhibit ultra-small particle sizes which are lower than 3 nm. When used as catalysts for the HER in both acid and basic media, Mo2C exhibits the best catalytic activity with a small overpotential of 135 mV in acid media and 96 mV in alkaline media at a current density of 10 mA cm(-2), which is about 105 mV and 30 mV higher than that with Pt/C, respectively. The enhanced catalytic activity of Mo2C could originate from the excellent crystal structure, the high electronic conductivity of the carbon support with a high degree of graphitization and the ultra-small particle size, which provides a large surface area and active sites.
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