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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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Publication details

The article was received on 07 Feb 2014, accepted on 10 Apr 2014 and first published on 11 Apr 2014


Article type: Communication
DOI: 10.1039/C4EE00440J
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Energy Environ. Sci., 2014,7, 2255-2260
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    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

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