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Nanoscale Strontium Titanate Photocatalysts for Overall Water Splitting
Abstract
SrTiO(3) (STO) is a large band gap (3.2 eV) semiconductor that catalyzes the overall water splitting reaction under UV light irradiation in the presence of a NiO cocatalyst. As we show here, the reactivity persists in nanoscale particles of the material, although the process is less effective at the nanoscale. To reach these conclusions, Bulk STO, 30 ± 5 nm STO, and 6.5 ± 1 nm STO were synthesized by three different methods, their crystal structures verified with XRD and their morphology observed with HRTEM before and after NiO deposition. In connection with NiO, all samples split water into stoichiometric mixtures of H(2) and O(2), but the activity is decreasing from 28 μmol H(2) g(-1) h(-1) (bulk STO), to 19.4 μmol H(2) g(-1) h(-1) (30 nm STO), and 3.0 μmol H(2) g(-1) h(-1) (6.5 nm STO). The reasons for this decrease are an increase of the water oxidation overpotential for the smaller particles and reduced light absorption due to a quantum size effect. Overall, these findings establish the first nanoscale titanate photocatalyst for overall water splitting.
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Iwashina, K., & Kudo, A. (2011) · Journal of the American Chemical Society · doi:10.1021/ja2050315 · Cited by 457
Cited by
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Self-citationEngineering heterogeneous semiconductors for solar water splitting
Li, X., Yu, J., Low, J., Fang, Y., Xiao, J., & Chen, X. (2015) · Journal of Materials Chemistry A · doi:10.1039/c4ta04461d · Cited by 1,888
Photocatalytic and Photoelectrochemical Systems: Similarities and Differences
Wu, H., Tan, H. L., Toe, C. Y., Scott, J., Wang, L., Amal, R., & Ng, Y. H. (2020) · Advanced Materials · doi:10.1002/adma.201904717 · Cited by 394
Solar Light Driven Pure Water Splitting on Quantum Sized BiVO4 without any Cocatalyst
Sun, S., Wang, W., Li, D., Zhang, L., & Jiang, D. (2014) · ACS Catalysis · doi:10.1021/cs501076a · Cited by 317
Osterloh, F. E. (2017) · ACS Energy Letters · doi:10.1021/acsenergylett.6b00665 · Cited by 305
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Metadata
- Authors
- Townsend, T. K., Browning, N. D., & Osterloh, F. E.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-07-27
- Volume
- 6
- Issue
- 8
- Pages
- 7420-7426
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2052707466
- Cited by
- 264
- References
- 1
- FWCI
- 8.50
- Type
- journal article
- Language
- en
- Open access
- closed
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