Determination of Hydrogen Oxidation Reaction Mechanism Based on Pt−Had Energetics in Alkaline Electrolyte. Issue 15 (20th November 2018)

• Record Type: Journal Article
• Authors: Hu, Jue; Kuttiyiel, Kurian A.; Sasaki, Kotaro; Zhang, Chengxu; Adzic, Radoslav R.
• Is Part Of: Journal of the Electrochemical Society. Volume 165:Issue 15(2018)
• Page Start: J3355
• Page End: J3362
• Publication Date: 2018-11-20
• Subjects: Electrocatalysis -- Energy Conversion -- Fuel Cells - PEM -- core-shell catalysts -- hydrogen oxidation reaction -- reaction kinetics; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0471815jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : 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.