Abstract
The hydrogen evolution reaction (HER) on an electrodeposited a-MoS2 electrode was investigated by a surface-selective electrochemical titration technique by application of surface interrogation scanning electrochemical microscopy. In a mildly acidic (pH 4.6) environment, the saturated surface hydride coverage of MoS2 was determined to be 31%, much higher than that expected for a crystalline nanoparticle. The HER rate constant of a surface molybdenum atom was measured for the first time in situ to be 3.8 s-1 at a 600 mV overpotential. At high Mo-H coverages, a change in the nature of the active sites was observed upon consumption of Mo-H by HER.
Original language | English |
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Pages (from-to) | 2748-2752 |
Number of pages | 5 |
Journal | Journal of Physical Chemistry Letters |
Volume | 7 |
Issue number | 14 |
DOIs | |
Publication status | Published - 2016 Jul 21 |
Bibliographical note
Publisher Copyright:© 2016 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physical and Theoretical Chemistry