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Title: Understanding the pH Dependence of Underpotential Deposited Hydrogen on Platinum

Journal Article · · Angewandte Chemie
 [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. Center for Catalytic Science and Technology Department of Chemical and Biomolecular Engineering University of Delaware 150 Academy Street Newark DE 19716 USA

Abstract Understanding the pH dependent shift of the oxidation peak of the underpotential deposited hydrogen (H upd ) in cyclic voltammograms on the Pt surface is of significance in terms of both the fundamentals of electrochemistry and the rational design of catalysts for the hydrogen oxidation/evolution reactions (HOR/HER). In this work, we provide compelling evidence that the pH dependent shift in the H upd peak on Pt surfaces is driven by the structure of interfacial water rather than the specific adsorption of cations on the electrode surface. Combined cyclic voltammetric and surface enhanced spectroscopic investigations using an organic cation and crown‐ether chelated alkali metal cations show that specific adsorption of metal and organic cations on the Pt surface at the conditions relevant to the HOR/HER is unlikely. The vibrational band corresponding to strongly bound water is monitored when the electrode potential is varied in the H upd range in both acid and base.

Sponsoring Organization:
USDOE
OSTI ID:
1573290
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 131 Journal Issue: 49; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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