Journal
CHEMICAL ENGINEERING JOURNAL
Volume 358, Issue -, Pages 362-368Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.09.047
Keywords
Molybdenum carbide; Heterophase; Mo sheets; Nitrogen doping; Carbon wrapping; Hydrogen evolution reaction
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Funding
- Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2016TQ03N541]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2017B030306001]
- National Natural Science Foundation of China [51502096, 91745203]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
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Advancement of non-precious-metal catalysts for hydrogen evolution reactions (HER) with both prominent activity and excellent stability has been becoming an ongoing challenge in the following decades. Herein, N-doped carbon-wrapped molybdenum carbide heterophase (gamma-MoC and beta-Mo2C) sheets (N-MoxC@C HSs) were prepared by a facile chemical vapor reduction (CVR) procedure and following calcination at desired temperatures. The best HER electrocatalytic activity of N-MoC@C HSs was detailedly examined in 0.5 M H2SO4, which exhibited a small overpotential of 172 mV (10 mA cm(-2)) with a Tafel slope of only 60 mV dec(-1) and durability. The improved HER activities and catalytic stability were due to heterocrystal Mo2C, nitrogen doping, and carbon coating. Particularly, this study effectively combined the respective advantages of both gamma-MoC and beta-Mo2C via the interface effect and matched polarity of hydrogen adsorption.
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