Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 14, Pages 6746-6751Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm16178h
Keywords
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Funding
- Ministry of Science and Technology of China [2009CB220001]
- NSFC [50921004, 51002160, 21090343, 51172243]
- Solar Energy Initiative
- Chinese Academy of Sciences [KJCX2-YW-H21-01, INFO-115-B01]
- Supercomputing Center of CAS, China
- IMR SYNL
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The reactivity of a photocatalyst is basically influenced by its surface atomic and linked electronic structure. Tuning different crystal facets is becoming an important strategy to optimize the reactivity of a photocatalyst for targeted reactions. Here we report a facile and new route of synthesizing a quasi-cubic-like WO3 crystal with a nearly equal percentage of {002}, {200} and {020} facets, and a rectangular sheet-like WO3 crystal with predominant {002} facet by controlling acidic hydrolysis of crystalline WB. As a result of electronic structure effects induced by crystal facet, the quasi-cubic-like WO3 crystal with a deeper valence band maximum shows a much higher O-2 evolution rate in photocatalytic water oxidation than the rectangular sheet-like WO3 crystal. The latter, with an elevated conduction band minimum of 0.3 eV, is able to photoreduce CO2 to generate CH4 in the presence of H2O vapor.
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