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Studies of the electrodeposition of platinum metal from a hexachloroplatinic acid bath

Studies of the electrodeposition of platinum metal from a hexachloroplatinic acid bath
Studies of the electrodeposition of platinum metal from a hexachloroplatinic acid bath
The mechanism of platinum deposition onto carbon from a bath containing H2PtCl6 in 0.1 M HCl is discussed. Although voltammograms show multiple cathodic waves, it is shown that they all result from the reduction of Pt(IV) to Pt(0) and there is no evidence for Pt(II) as a stable intermediate at any potential; the multiple waves arise because the hexachloroplatinic acid exists in solution as a mixture of kinetically inert Cl?/H2O complexes. The nucleation of the Pt centres on carbon is a very slow process even with a large overpotential and this leads to surfaces with well dispersed hemispherical nuclei. Moreover, each Pt centre appears to grow only to a limiting size before growth ceases.

chloroplatinic acid, pt electrodeposition
1572-6657
327-332
Yasin, Hartini M.
f0874b1c-e8d9-4fe8-9bb3-31d4b1343acd
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Yasin, Hartini M.
f0874b1c-e8d9-4fe8-9bb3-31d4b1343acd
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30

Yasin, Hartini M., Denuault, Guy and Pletcher, Derek (2009) Studies of the electrodeposition of platinum metal from a hexachloroplatinic acid bath. Journal of Electroanalytical Chemistry, 633 (2), 327-332. (doi:10.1016/j.jelechem.2009.06.020).

Record type: Article

Abstract

The mechanism of platinum deposition onto carbon from a bath containing H2PtCl6 in 0.1 M HCl is discussed. Although voltammograms show multiple cathodic waves, it is shown that they all result from the reduction of Pt(IV) to Pt(0) and there is no evidence for Pt(II) as a stable intermediate at any potential; the multiple waves arise because the hexachloroplatinic acid exists in solution as a mixture of kinetically inert Cl?/H2O complexes. The nucleation of the Pt centres on carbon is a very slow process even with a large overpotential and this leads to surfaces with well dispersed hemispherical nuclei. Moreover, each Pt centre appears to grow only to a limiting size before growth ceases.

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More information

Published date: 15 August 2009
Keywords: chloroplatinic acid, pt electrodeposition

Identifiers

Local EPrints ID: 158675
URI: http://eprints.soton.ac.uk/id/eprint/158675
ISSN: 1572-6657
PURE UUID: c3e641ea-184d-4121-b7ca-645ebca81d38
ORCID for Guy Denuault: ORCID iD orcid.org/0000-0002-8630-9492

Catalogue record

Date deposited: 24 Jun 2010 08:24
Last modified: 29 Oct 2019 02:07

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