Photoelectrochemical analyses of photocatalytic reactions of azobenzene on TiO2 powder

✍ Scribed by Hideki Minoura; Yoshihiko Katoh; Takashi Sugiura; Yasusada Ueno; Masaki Matsui; Katsuyoshi Shibata

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 450 KB
• Volume: 173
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)80082-o

✦ Synopsis

Photoelcctrochemical processes in the formation of 2.phenylindazole from 4-methoxyazobenzene with powdered TiOl photocatalyst in methanolic solution has been analyzed by using a Ti02 film electrode under controlled potentials. The experimental facts that the reaction yields depend strongly upon the electrolytic potential and are quite high only under weak anodic polarization (weak upward band bending) suggest that electrons as well as positive holes participate in the formation of 2.phcuylindaxole cooperatively, which confirms our assumption for the reaction mechanism reported earlier. The results demonstrate that the photoelectrochemical techniques serve as a useful tool for clarifying photocatalytic processes in the organic synthesis occurring on illuminated semiconductor powders.