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Analysis of temperature effects on hydrogen and OH adsorption on Pt(111), Pt(100) and Pt(110) by means of Gibbs thermodynamics

Analysis of temperature effects on hydrogen and OH adsorption on Pt(111), Pt(100) and Pt(110) by means of Gibbs thermodynamics
Analysis of temperature effects on hydrogen and OH adsorption on Pt(111), Pt(100) and Pt(110) by means of Gibbs thermodynamics
Gibbs thermodynamics in the presence of charge-transfer processes have been applied to characterize temperatureeffects on Pt(1 1 1), Pt(1 0 0) and Pt(1 1 0) electrodes in 0.1 M HClO4 solutions. The present analysis allows the evaluation of the entropy of formation of the interphase for the three platinum basal planes, which is found to be structure-sensitive. In addition, these results have been used to test the suitability of the more common approach to characterize temperatureeffects, based on the application of a generalized isotherm. Besides, the comparison of both approaches allows the characterization of the different components involved in the entropy of hydrogen and OHadsorption, namely, the standard entropy of adsorption, the entropy due to lateral interactions, and the configurational entropy. Finally, the comparison with statistical mechanical calculations demonstrates that adsorbed hydrogen on Pt(1 1 1) and Pt(1 0 0) is rather mobile, while adsorbed OH is rather immobile. Adsorbed hydrogen on Pt(1 1 0) exhibits an unexpected behavior, since it appears to be rather immobile at low coverages, but it becomes very mobile at near saturation coverages
1572-6657
69-82
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Climent, Victor
c3ecab58-edb5-4055-8fa0-c0aef0fc60a4
Feliu, Juan M.
f2a5301a-2886-4f27-b614-99a74a0a9a28
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Climent, Victor
c3ecab58-edb5-4055-8fa0-c0aef0fc60a4
Feliu, Juan M.
f2a5301a-2886-4f27-b614-99a74a0a9a28

Garcia-Araez, Nuria, Climent, Victor and Feliu, Juan M. (2010) Analysis of temperature effects on hydrogen and OH adsorption on Pt(111), Pt(100) and Pt(110) by means of Gibbs thermodynamics. Journal of Electroanalytical Chemistry, 649 (1-2), 69-82. (doi:10.1016/j.jelechem.2010.01.024).

Record type: Article

Abstract

Gibbs thermodynamics in the presence of charge-transfer processes have been applied to characterize temperatureeffects on Pt(1 1 1), Pt(1 0 0) and Pt(1 1 0) electrodes in 0.1 M HClO4 solutions. The present analysis allows the evaluation of the entropy of formation of the interphase for the three platinum basal planes, which is found to be structure-sensitive. In addition, these results have been used to test the suitability of the more common approach to characterize temperatureeffects, based on the application of a generalized isotherm. Besides, the comparison of both approaches allows the characterization of the different components involved in the entropy of hydrogen and OHadsorption, namely, the standard entropy of adsorption, the entropy due to lateral interactions, and the configurational entropy. Finally, the comparison with statistical mechanical calculations demonstrates that adsorbed hydrogen on Pt(1 1 1) and Pt(1 0 0) is rather mobile, while adsorbed OH is rather immobile. Adsorbed hydrogen on Pt(1 1 0) exhibits an unexpected behavior, since it appears to be rather immobile at low coverages, but it becomes very mobile at near saturation coverages

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Published date: 15 November 2010
Organisations: Electrochemistry

Identifiers

Local EPrints ID: 345801
URI: https://eprints.soton.ac.uk/id/eprint/345801
ISSN: 1572-6657
PURE UUID: e9c6c499-bed0-4dd0-9d53-1792a4d26a41
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379

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Date deposited: 30 Nov 2012 14:28
Last modified: 03 Dec 2019 01:37

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Contributors

Author: Victor Climent
Author: Juan M. Feliu

University divisions

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