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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Highly active and stable hydrogen evolution electrocatalysts based on molybdenum compounds on carbon nanotube-graphene hybrid support

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Title
Highly active and stable hydrogen evolution electrocatalysts based on molybdenum compounds on carbon nanotube-graphene hybrid support
Author
Youn, Duck HyunHan, SuenghoonKim, Jae YoungKim, Jae YulPark, HunminChoi, Sun HeeLee, Jae Sung
Keywords
CNT-graphene hybrid; hydrogen evolution reaction; molybdenum carbide; molybdenum nitride; nonprecious metal electrocatalysts
Issue Date
201405
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.8, no.5, pp.5164 - 5173
Abstract
Highly active and stable electrocatalysts for hydrogen evolution have been developed on the basis of molybdenum compounds (Mo2C, Mo 2N, and MoS2) on carbon nanotube (CNT)-graphene hybrid support via a modified urea-glass route. By a simple modification of synthetic variables, the final phases are easily controlled from carbide, nitride to sulfide with homogeneous dispersion of nanocrystals on the CNT-graphene support. Among the prepared catalysts, Mo2C/CNT-graphene shows the highest activity for hydrogen evolution reaction with a small onset overpotential of 62 mV and Tafel slope of 58 mV/dec as well as an excellent stability in acid media. Such enhanced catalytic activity may originate from its low hydrogen binding energy and high conductivity. Moreover, the CNT-graphene hybrid support plays crucial roles to enhance the activity of molybdenum compounds by alleviating aggregation of the nanocrystals, providing a large area to contact with electrolyte, and facilitating the electron transfer.
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DOI
http://dx.doi.org/10.1021/nn5012144
ISSN
1936-0851
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