2018年5月1日
Role of CoOx cocatalyst on Ta3N5 photocatalysts studied by transient visible to mid-infrared absorption spectroscopy
Journal of Photochemistry and Photobiology A: Chemistry
- ,
- ,
- ,
- 巻
- 358
- 号
- 開始ページ
- 315
- 終了ページ
- 319
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jphotochem.2017.09.005
- 出版者・発行元
- Elsevier B.V.
Tantalum nitride (Ta3N5) photocatalysts attract considerable attention owing to their visible light absorption below 600 nm and suitable band structures for reduction and oxidation of water to generate hydrogen and oxygen gas. Herein, we investigated the effects of CoOx on the dynamics of photogenerated charge carriers in Ta3N5 powder photocatalysts by using microsecond to millisecond transient visible to mid-IR absorption spectroscopy. Transient absorption measurements revealed that most of the electrons in Ta3N5 are deeply trapped at the defects, most likely originating from oxygen vacancies and reduced Ta species. Two important roles of CoOx were elucidated: effective capture of holes to prolong electron lifetime and reduction of defects as recombination centers, which further elongates the lifetime of both electrons and holes.
- ID情報
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- DOI : 10.1016/j.jphotochem.2017.09.005
- ISSN : 1010-6030
- SCOPUS ID : 85029539181