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Citation: Wang Yan-qin, Cheng Hu-Min, Ma Ji-Ming. The Photoelectrochemical Properties of Composite Titanium Dioxide and Ferric Oxide Nanocrystalline Electrodes[J]. Acta Physico-Chimica Sinica, ;1999, 15(03): 222-227. doi: 10.3866/PKU.WHXB19990306 shu

The Photoelectrochemical Properties of Composite Titanium Dioxide and Ferric Oxide Nanocrystalline Electrodes

1.
Department of Chemistry,Peking University,Beijing 100871

Received Date: 7 July 1998
Available Online: 15 March 1999

The photoelectrochemical behaviors of the mutual modified nanocrystalline Fe 2O 3 and TiO 2 electrodes prepared by different methods (including the mutual doping of metal ions) were studied. With different incident light wavelength, transient photocurrent spectra showed different characteristics. A characteristics of n-type semiconductor appeared in Ti 4+ doped Fe2O3 nanocrystalline electrode; but there was no photoresponse in Fe2O3 coated TiO2 electrodes because of the dismatch of the energy levels of Fe 2O 3 and TiO 2; a characteristics of p n response coexistence appeared in Fe 3+ doped TiO 2 electrode and TiO 2 modified (coated or coupled ) Fe2O3 nanocrystalline electrodes, even the characteristic of p type semiconductor appeared in two special electrodes. All these phenomena can be explained reasonably by the formation of the microzone of p-type semiconductor.
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