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- Title
Molybdenum Carbide‐Oxide Heterostructures: In Situ Surface Reconfiguration toward Efficient Electrocatalytic Hydrogen Evolution.
- Authors
He, Liuqing; Zhang, Wenbiao; Mo, Qijie; Huang, Wenjie; Yang, Lichun; Gao, Qingsheng
- Abstract
Heterostructured Mo2C‐MoOx on carbon cloth (Mo2C‐MoOx/CC), as a model of easily oxidized electrocatalysts under ambient conditions, is investigated to uncover surface reconfiguration during the hydrogen evolution reaction (HER). Raman spectroscopy combined with electrochemical tests demonstrates that the MoVI oxides on the surface are in situ reduced to MoIV, accomplishing promoted HER in acidic condition. As indicated by density functional theoretical calculations, the in situ reduced surface with terminal Mo=O moieties can effectively bring the negative ΔGH* on bare Mo2C close to a thermodynamic neutral value, addressing difficult H* desorption toward fast HER kinetics. The optimized Mo2C‐MoOx/CC only requires a low overpotential (η10) of 60 mV at −10 mA cm−2 in 1.0 m HClO4, outperforming Mo2C/CC and most non‐precious electrocatalysts. In situ surface reconfiguration are shown on W2C‐WOx, highlighting the significance to boost various metal‐carbides and to identify active sites.
- Subjects
HYDROGEN evolution reactions; MOLYBDENUM compounds; HETEROSTRUCTURES; MOLYBDENUM; RAMAN spectroscopy; HYDROGEN; ELECTROCATALYSTS
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 9, p3572
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201914752