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Volume 210, 2018
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Hydrogen adsorption on nano-structured platinum electrodes

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Abstract

The “hydrogen region” of platinum is a powerful tool to structurally characterize nanostructured platinum electrodes. In recent years, the understanding of this hydrogen region has improved considerably: on Pt(111) sites, there is indeed only hydrogen adsorption, while on step sites, the hydrogen region involves the replacement of adsorbed hydrogen by adsorbed hydroxyl which interacts with co-adsorbed cations. However, the hydrogen region features an enigmatic and less well-understood “third hydrogen peak”, which develops on oxidatively roughened platinum electrodes as well as on platinum electrodes with a high (110) step density that have been subjected to a high concentration of hydrogen. In this paper, we present evidence that the peak involves surface-adsorbed hydrogen (instead of subsurface hydrogen) on a locally “reconstructed” (110)-type surface site. This site is unstable when the hydrogen is oxidatively removed. The cation sensitivity of the third hydrogen peak appears different from other step-related peaks, suggesting that the chemistry involved may still be subtly different from the other features in the hydrogen region.

Graphical abstract: Hydrogen adsorption on nano-structured platinum electrodes

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Submitted
08 Mar 2018
Accepted
27 Mar 2018
First published
27 Mar 2018

Faraday Discuss., 2018,210, 301-315
Article type
Paper

Hydrogen adsorption on nano-structured platinum electrodes

O. Diaz-Morales, T. J. P. Hersbach, C. Badan, A. C. Garcia and M. T. M. Koper, Faraday Discuss., 2018, 210, 301
DOI: 10.1039/C8FD00062J

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