Mechanism of cathodic PtCl 6 2- reduction to platinum clusters on electrodes coated with polyvinylpyridinium films
Tóm tắt
The electrochemical reduction of PtCl
6
2-
/HCl to Pt0 is investigated on electrodes coated with anion exchange polymer films. The first step is the cathodic reduction to PtCl
4
2-
. Three possible routes for the reaction PtCl
4
2-
to Pt0 are discussed: (i) a second electrochemical step; (ii) PtCl
4
2-
disproportionation; (iii) reduction by cathodically produced H2. It is demonstrated that route (i) is normally dominant. The Pt0 produced has a large surface area. Individual microparticles (‘clusters’) can be conveniently formed. As expected from the electrochemical mechanism the Pt0 produced is located at the electrode-coating interface.
Tài liệu tham khảo
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