Water Splitting over New Niobate Photocatalysts with Tungsten-Bronze-Type Structure and Effect of Transition Metal-Doping
✍ Scribed by Dr. Yugo Miseki; Prof. Akihiko Kudo
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2010
- Tongue
- English
- Weight
- 489 KB
- Volume
- 4
- Category
- Article
- ISSN
- 1864-5631
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✦ Synopsis
Abstract
Photophysical properties and photocatalytic activities for water splitting over KM~2~Nb~5~O~15~ (M=Sr and Ba) and K~2~LnNb~5~O~15~ (Ln=La, Pr, Nd, and Sm) with tungsten bronze‐type structure were investigated. Single phases of KM~2~Nb~5~O~15~ and K~2~LnNb~5~O~15~ were successfully prepared by solid‐state reaction (SSR) method and polymerizable complex (PC) method. The band gaps of these niobates were estimated to be 3.1–3.5 eV. These metal oxides loaded with an activated NiO~x~ cocatalyst showed photocatalytic activities for water splitting into H~2~ and O~2~ under UV irradiation. When K~2~LaNb~5~O~15~ was doped by Rh ions, a new visible‐light absorption band was observed around 400–500 nm in addition to the band gap absorption band of the K~2~LaNb~5~O~15~ host. K~2~LaNb~5~O~15~:Rh showed photocatalytic activities for H~2~ or O~2~ evolution from an aqueous solution containing a sacrificial reagent under visible‐light irradiation.