Photoelectrochemical proton reduction with coated zinc tetraphenylporphin dispersed into poly(4-vinylpyridine)
✍ Scribed by Toshiyuki Abe; Hiroshi Imaya; Sumio Tokita; Dieter Wöhrle; Masao Kaneko
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 181 KB
- Volume
- 01
- Category
- Article
- ISSN
- 1088-4246
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✦ Synopsis
Photoelectrochemical proton reduction for H 2 production was found with zinc tetraphenylporphyrin (ZnTPP) dispersed into a poly(4-vinylpyridine) (PVP) membrane coated on a platinum electrode (Pt/PVP [ZnTPP]) and dipped in an aqueous solution. The photocurrent in the Pt/PVP[ZnTPP] system was generated in the potential region below -0.40 V (vs. Ag/AgCl). The action spectrum of the photocurrent showed that the photoelectrochemical event is induced by the excitation of ZnTPP. The singlet lifetime of the PVP[ZnTPP] system under the applied potential of -0.45 V (vs. Ag/AgCl) is shorter than that without the applied potentials, showing that the singlet ZnTPP* species is quenched reductively to ZnTPP -by electron injection from the platinum electrode. The proton is catalytically reduced to H 2 by ZnTPP -supposedly on the platinum surface.