Abstract
We report a new CVD method to prepare coral-shaped monolayer MoS2 with a large amount of exposed edge sites for catalyzing hydrogen evolution reaction. The electrocatalytic activities of the coral-shaped MoS2 can be further enhanced by electronic band engineering via decorated with graphene quantum dot (GQD) decoration. Generally, GQDs improve the electrical conductivity of the MoS2 electrocatalyst. First-principles calculations suggest that the coral MoS2@GQD is a zero-gap material. The high electric conductivity and pronounced catalytically active sites give the hybrid catalyst outstanding electrocatalytic performance with a small onset overpotential of 95 mV and a low Tafel slope of 40 mV/dec as well as excellent long-term electrocatalytic stability. The present work provides a potential way to design two-dimensional hydrogen evolution reaction (HER) electrocatalysts through controlling the shape and modulating the electric conductivity.
Original language | English |
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Pages (from-to) | 3653-3660 |
Number of pages | 8 |
Journal | ACS Applied Materials and Interfaces |
Volume | 9 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2017 Feb 1 |
Keywords
- Coral shape
- Electrocatalysis
- Graphene quantum dots
- Hydrogen evolution reaction
- Monolayer molybdenum disulfide
ASJC Scopus subject areas
- Materials Science(all)