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Hydrogen adsorption on nano-structured platinum


This paper summarizes our current understanding of the so-called “hydrogen region” of nanostructured platinum electrodes. While on Pt(111) sites there is indeed only hydrogen adsorption in the hydrogen region, step sites in platinum involve the replacement of adsorbed hydrogen by adsorbed hydroxyl, which interacts with co-adsorbed cations. The so-called “third hydrogen peak”, which develops on oxidatively roughened platinum electrodes, and on platinum electrodes with a high (110) step density subjected to a high concentration of hydrogen, remains one of the elusive peaks in the hydrogen region. We present evidence that the peak involves surface-adsorbed hydrogen (instead of subsurface of occluded hydrogen) on a locally “reconstructed” (110)-type surface site, which 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 subtly different.

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Publication details

The article was received on 08 Mar 2018, accepted on 27 Mar 2018 and first published on 27 Mar 2018

Article type: Paper
DOI: 10.1039/C8FD00062J
Citation: Faraday Discuss., 2018, Accepted Manuscript
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    Hydrogen adsorption on nano-structured platinum

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

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