Peculiarities of the Pt(Cu)/C catalyst formation by galvanic displacement of copper in H2PtCl4 solutions
Autor: | A. Yu. Filatov, Lada V. Yashina, Boris I. Podlovchenko, T. D. Gladysheva |
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Rok vydání: | 2012 |
Předmět: | |
Zdroj: | Russian Journal of Electrochemistry. 48:173-180 |
ISSN: | 1608-3342 1023-1935 |
Popis: | Specific features of the formation of a Pt(Cu) catalyst by the galvanic displacement of electroplated copper (carbon support) in a PtCl 4 2− solution are considered. The composition, the structure, and electrochemical properties of Pt(Cu) deposits in different stages of displacement are studied by a complex of methods (SEM, TEM, XPS, voltammetry, etc.). The gradual formation of a stable “core(Pt, Cu)-shell(Pt)” structure with the average atomic ratio Pt : Cu ≈ 3 : 1 is observed. The results for PtCl 4 2− are compared with the analogous results for PtCl 6 2− published earlier. Particularly, the reasons for the differences in the steady state potentials established on the Pt(Cu)st/C electrode in the presence of PtCl 4 2− and PtCl 6 2− are discussed. |
Databáze: | OpenAIRE |
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