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On the conditions and mechanism of PtO2 formation in the photoinduced conversion of H2PtCl6

✍ Scribed by Zhensheng Jin; Zhengshi Chen; Qinglin Li; Chanjuan Xi; Xinhua Zheng

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
537 KB
Volume
81
Category
Article
ISSN
1010-6030

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✦ Synopsis

X-ray photoelectron spectroscopy (XPS) and UV-visible absorption spectroscopy were used to investigate the conditions and mechanism of PtOz formation during the photoinduced conversion of PtCl,'-in a Pt/CdS aqueous dispersion. The experimental results indicate that the critical factors affecting PtOz formation are the pH value of the dispersion and the initial H,PtCI, concentration. At pH13 and an initial H,PtCI, concentration of lOA2 M, the deposits detected on the illuminated Pt/CdS surface were Pt02 and Pt(OH),. It is suggested that PtO, is formed by the photoinduced oxidation of the hydrolysate of PtCI,'-(i.e. Pt(OH),C12'-) on the Pt/CdS surface. The formation of oxygen was also observed in the process.

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