New insights into the electrochemical hydrogen oxidation and evolution reaction mechanism

J. Durst; A. Siebel; C. Simon; F. Hasché; J. Herranz; H. A. Gasteiger

doi:10.1039/c4ee00440j

New insights into the electrochemical hydrogen oxidation and evolution reaction mechanism

J. Durst, A. Siebel, C. Simon, F. Hasché, J. Herranz, H. A. Gasteiger

Chair of Technical Electrochemistry

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

1379 Scopus citations

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 H ₂-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.

Original language	English
Pages (from-to)	2255-2260
Number of pages	6
Journal	Energy and Environmental Science
Volume	7
Issue number	7
DOIs	https://doi.org/10.1039/c4ee00440j
State	Published - Jul 2014

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title = "New insights into the electrochemical hydrogen oxidation and evolution reaction mechanism",

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 H 2-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.",

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T1 - New insights into the electrochemical hydrogen oxidation and evolution reaction mechanism

AU - Durst, J.

AU - Siebel, A.

AU - Simon, C.

AU - Hasché, F.

AU - Herranz, J.

AU - Gasteiger, H. A.

PY - 2014/7

Y1 - 2014/7

N2 - 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 H 2-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.

AB - 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 H 2-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.

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JO - Energy and Environmental Science

JF - Energy and Environmental Science

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New insights into the electrochemical hydrogen oxidation and evolution reaction mechanism

Abstract

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