期刊
ACS NANO
卷 11, 期 1, 页码 384-394出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b06089
关键词
Mo2C; graphene nanoribbon; hydrogen-evolution reaction; oxygen-reduction reaction; atomic H
类别
资金
- National Natural Science Foundation of China [21603129]
- Air Force Office of Scientific Research [FA9550-09-1-0581]
- AFOSR MURI program [FA9550-12-1-0035]
- Resnick Prize Postdoctoral Fellowship at Caltech
- DOE Office of Energy Efficiency and Renewable Energy
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Science Foundation [ACI-1053575]
Mo2C nanocrystals (NCs) anchored on vertically aligned graphene nanoribbons (VA-GNR) as hybrid nanoelectrocatalysts (Mo2C-GNR) are synthesized through the direct carbonization of metallic Mo with atomic H treatment. The growth mechanism of Mo2C NCs with atomic H treatment is discussed. The Mo2C-GNR hybrid exhibits highly active and durable electrocatalytic performance for the hydrogen-evolution reaction (HER) and oxygen-reduction reaction (ORR). For HER, in an acidic solution the Mo2C-GNR has an onset potential of 39 mV and a Tafel slope of 65 mV dec(-1), and in a basic solution Mo2C-GNR has an onset potential of 53 mV, and Tafel slope of 54 mV dec(-1). It is stable in both acidic and basic media. Mo2C-GNR is a high-activity ORR catalyst with a high peak current density of 2.01 mA cm(-2), an onset potential of 0.93 V that is more positive vs reversible hydrogen electrode (RHE), a high electron transfer number n (similar to 3.90), and long-term stability.
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