Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 13, Pages 4854-4858Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b00279
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Funding
- National Science Foundation [CHE-1405248]
- Welch Foundation [F-0021]
- National Natural Science Foundation of China [21676106, 21476087]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1405248] Funding Source: National Science Foundation
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The hydrogen evolution reaction (HER) on Ni in alkaline media was investigated by scanning electrochemical microscopy under two operating modes. First, the substrate generation/tip collection mode was employed to extract the true cathodic current associated with the HER from the total current in the polarization curve. Compared to metallic Ni, the electrocatalytic activity of the HER is improved in the presence of the low-valence-state oxide of Ni. This result is in agreement with a previous claim that the dissociative adsorption of water can be-enhanced at the Ni/Ni oxide interface. Second, the surface interrogation scanning electrochemical microscopy (SI-SECM) mode was used to directly measure the coverage of the adsorbed hydrogen on Ni at given potentials. Simulation indicates that the hydrogen coverage follows a Frumkin isotherm with respect to the applied potential. On the basis of the combined analysis of the Tafel slope and surface hydrogen coverage, the rate determining step is suggested to be the adsorption of hydrogen (Volmer step) in the investigated potential window.
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