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Enhancement of UV-responsive photocatalysts aided by visible-light responsive photocatalysts : Role of WO3 for H2 evolution on CuCl
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| Title: | Enhancement of UV-responsive photocatalysts aided by visible-light responsive photocatalysts : Role of WO3 for H2 evolution on CuCl |
| Authors: | Takagi, Masaki Browse this author | | Kawaguchi, Masayuki Browse this author | | Yamakata, Akira Browse this author →KAKEN DB |
| Keywords: | Z-Scheme photocatalysis | | WO3 | | H2 evolution | | CuCl | | Charge carrier dynamics |
| Issue Date: | Apr-2020 |
| Journal Title: | Applied Catalysis B: Environmental |
| Volume: | 263 |
| Start Page: | 118333 |
| Publisher DOI: | 10.1016/j.apcatb.2019.118333 |
| Abstract: | WO3 is one of the most popular materials for visible-light photocatalysts. However, its conduction band minimum is too low for water reduction. Here, we found that WO3 can assist water reduction by using visible light in a CuCl2 aqueous solution. Photoirradiation of WO3 in CuCl2 reduces Cu2+ to form indissoluble CuCl adducts, and as-produced CuCl/WO3 was active for H2 evolution under UV-light. This composite has very low reactivity under visible light (>400 nm), but visible-light assisted H2 evolution was observed with simultaneous irradiation with UV light: the activity was increased ∼1.7 fold. Transient absorption measurements revealed that Z-schematic recombination initially takes place between photogenerated electrons in WO3 and holes in CuCl. As a result, the lifetime of electrons in CuCl was increased, enhancing H2 evolution. These results demonstrate that inactive narrow-band gap materials can be used to enhance the activity of wide-band gap materials under sunlight illumination. |
| Rights: | © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ | | https://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/84730 |
| Appears in Collections: | 触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 山方 啓
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