Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 47, Pages 40500-40508Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b13215
Keywords
molybdenum carbides; molten salts; crystal faces; electrocatalysts; hydrogen evolution
Funding
- National Natural Science Foundation of China [51771131]
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Developing high surface area Mo2C with certain crystal plane exposed is an efficient strategy but is an urgent challenge to optimize the hydrogen evolution reaction (HER) catalytic performances. In addition, the effects of certain crystal faces on catalytic performance have been limitedly understood. Toward this end, the (1 0 0) plane oriented two-dimensional lamellar Mo2C transformed from carbon fibers is synthesized successfully in a molten salt system. Subsequently, the electrocatalytic properties toward HER show that (1 0 0) plane oriented Mo2C functions well in both acidic and basic media. The density functional theory calculations show that the most stable Mo/C termination of the (1 0 0) plane contains multiple catalytically active centers. These close-to-zero Delta G(H)* values verify its better HER performance. Besides, the correlation between hydrogen adsorption behavior and the water dissociation process as well as their corresponding roles in the overall acid and alkaline HER rates have been discussed in depth. A simple mechanistic analysis is put forward to explain the favorable HER performance of the lamellar structure beta-Mo2C in alkaline other than acid electrolytes. The molten salt method may provide a new way for developing electrocatalysts with oriented crystal faces.
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