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Issue 7, 2014
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New insights into the electrochemical hydrogen oxidation and evolution reaction mechanism

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Abstract

The effect of pH on the hydrogen oxidation and evolution reaction (HOR/HER) rates is addressed for the first time for the three most active monometallic surfaces: Pt, Ir, and Pd carbon-supported catalysts. Kinetic data were obtained for a proton exchange membrane fuel cell (PEMFC; pH ≈ 0) using the H2-pump mode and with a rotating disk electrode (RDE) in 0.1 M NaOH. Our findings point toward: (i) a similar ≈100-fold activity decrease on all these surfaces when going from low to high pH; (ii) a reaction rate controlled by the Volmer step on Pt/C; and (iii) the H-binding energy being the unique and sole descriptor for the HOR/HER in alkaline electrolytes. Based on a detailed discussion of our data, we propose a new mechanism for the HOR/HER on Pt-metals in alkaline electrolytes.

Graphical abstract: New insights into the electrochemical hydrogen oxidation and evolution reaction mechanism

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Supplementary files

Article information


Submitted
07 Feb 2014
Accepted
10 Apr 2014
First published
11 Apr 2014

This article is Open Access

Energy Environ. Sci., 2014,7, 2255-2260
Article type
Communication
Author version available

New insights into the electrochemical hydrogen oxidation and evolution reaction mechanism

J. Durst, A. Siebel, C. Simon, F. Hasché, J. Herranz and H. A. Gasteiger, Energy Environ. Sci., 2014, 7, 2255 DOI: 10.1039/C4EE00440J

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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