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Water Splitting into H2 and O2 on New Sr2M2O7 (M = Nb and Ta) Photocatalysts with Layered Perovskite Structures: Factors Affecting the Photocatalytic Activity
Abstract
Sr 2 Ta 2 O 7 and Sr 2 Nb 2 O 7 with similar layered perovskite structure showed activities for water splitting into H 2 and O 2 in pure water without any additives under UV irradiation. The band gaps of Sr 2 Ta 2 O 7 and Sr 2 Nb 2 O 7 were 4.6 and 3.9 eV, respectively. Sr 2 Ta 2 O 7 gave H 2 and O 2 from pure water under UV irradiation even in the absence of a cocatalyst. The activity of Sr 2 Ta 2 O 7 was much increased by loading NiO as a cocatalyst even without pretreatment. The quantum yield of the NiO(0.15 wt %)/Sr 2 Ta 2 O 7 photocatalyst was 12% at 270 nm. On the other hand, native Sr 2 Nb 2 O 7 did not possess the activity. The high activity was obtained for the Sr 2 Nb 2 O 7 photocatalyst when NiO was loaded and pretreated. Factors affecting the photocatalytic activities were discussed by using the Sr 2 Ta 2 O 7 and Sr 2 Nb 2 O 7 powder with similar layered perovskite structure. A predominant factor affecting the photocatalytic behavior of Sr 2 Ta 2 O 7 and Sr 2 Nb 2 O 7 is the conduction band levels formed by Ta 5d and Nb 4d .
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Metadata
- Authors
- Kudo, A., Kato, H., & Nakagawa, S.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 1999-12-28
- Volume
- 104
- Issue
- 3
- Pages
- 571-575
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2951601229
- Cited by
- 633
- References
- 0
- FWCI
- 13.98
- Type
- journal article
- Language
- en
- Open access
- closed
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