Determination of Hydrogen Oxidation Reaction Mechanism Based on Pt-Had Energetics in Alkaline Electrolyte
- Brookhaven National Lab. (BNL), Upton, NY (United States); Kunming Univ. of Science and Technology (China)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Kunming Univ. of Science and Technology (China)
The understanding of the sluggish hydrogen oxidation reaction (HOR) kinetics in alkaline electrolyte is crucial for designing high performance electrocatalysts. Here, we report a clear and convincing result on this problem by investigating the relationship between the HOR kinetics and Pt-adsorbate energetics. Using electrochemical analysis for well-modified Pt surfaces with distinct Pt-adsorbate interactions, we establish a clear trend in activity for HOR in alkaline electrolyte, that is, the activity changes in the order Au@Pt < Pt < Pd@Pt < Ru@Pt. A decisive role of Pt-Had energetics in the HOR kinetics on Pt surfaces is determined, while no favorable effects of Pt-OHad energetics in the HOR kinetics were found. The nature of strong Pt-Had interaction for Pt/C catalyst in alkaline electrolyte is revealed by in-situ X-ray absorption near-edge structure (XANES) analysis. These insights play an important role for better understanding the mechanism and structure sensitivity for Pt catalyzed hydrogen oxidation reactions.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1485438
- Report Number(s):
- BNL-209670-2018-JAAM
- Journal Information:
- Journal of the Electrochemical Society, Vol. 165, Issue 15; ISSN 0013-4651
- Publisher:
- The Electrochemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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