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Titolo:
Enhancement of the photoinduced hydrophilic conversion rate of TiO2 film electrode surfaces by anodic polarization
Autore:
Sakai, N; Fujishima, A; Watanabe, T; Hashimoto, K;
Indirizzi:
Univ Tokyo, Adv Sci & Technol Res Ctr, Meguro Ku, Tokyo 1538904, Japan Univ Tokyo Tokyo Japan 1538904 Res Ctr, Meguro Ku, Tokyo 1538904, Japan Univ Tokyo, Sch Engn, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan UnivTokyo Tokyo Japan 1138656 ppl Chem, Bunkyo Ku, Tokyo 1138656, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 15, volume: 105, anno: 2001,
pagine: 3023 - 3026
SICI:
1520-6106(20010419)105:15<3023:EOTPHC>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOCATALYTIC OXIDATION; WATER; ANATASE; SPECTROSCOPY; DEPENDENCE; TIO2(110); DEFECTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Hashimoto, K Univ Tokyo, Adv Sci & Technol Res Ctr, Meguro Ku, 4-6-1 Komaba, Tokyo 1538904, Japan Univ Tokyo 4-6-1 Komaba Tokyo Japan 1538904 o 1538904, Japan
Citazione:
N. Sakai et al., "Enhancement of the photoinduced hydrophilic conversion rate of TiO2 film electrode surfaces by anodic polarization", J PHYS CH B, 105(15), 2001, pp. 3023-3026

Abstract

Changes in hydrophilicity of TiO2 film electrode surfaces by UV light irradiation in an aqueous solution were investigated under potential-controlledconditions. Although no change was observed when the electrode potential of TiO2 was set around its flat-band potential E-fb, the photoinduced hydrophilic conversion proceeded at potentials positive of Efb. The hydrophilic conversion rate increased with larger positive potentials, but the addition of hole scavengers decreased the rate, suggesting that the diffusion of photogenerated holes to the surface is the important process for the hydrophilic conversion. Based on these results, we propose a model in which the photoinduced hydrophilicity is initiated by two-hole trapping by a surface lattice oxygen, producing an oxygen defect, followed by the dissociative adsorption of a water molecule at the defect site.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 15:12:00