Photoelectrochemical properties of bismuth oxyhalide films

✍ Scribed by S.K. Poznyak; A.I. Kulak

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 673 KB
• Volume: 35
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(90)87103-9

✦ Synopsis

The photoelectrochemical (PEC) properties of bismuth oxyhalide (BiOCl, BiOBr and BiOI) electrodes prepared by anodic oxidation of bismuth films on a platinum substrate have been studied. In acidified potassium halide solutions, these electrodes have been found to exhibit the PEC properties characteristic of p-type semiconductors. The efficiency of the PEC process appreciably decreases in the series BiOCl > BiOBr > BiOI. Effective protectors of the BiOHal electrode photodecomposition are dissolved oxygen and hydroquinone/quinone redox pair. The spectral sensitization of BiOHal electrodes can be carried out by different dyes, the quantum efficiency of the sensitized process being relatively high (3-7%) in a number of cases. The ways of increasing the stability of sensitized PEC process on BiOHal electrodes are considered.