Journal
ACS CATALYSIS
Volume 5, Issue 11, Pages 6973-6979Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b02185
Keywords
g-C3N4; protonation; photocatalytic water oxidation; band structure; charge separation efficiency
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Funding
- Ministry of Science and Technology of China [2014CB239402, 2013CB834505, 2013CB834804]
- National Science Foundation of China [91427303, 21390404, 51373193]
- Key Research Programme of the Chinese Academy of Sciences [KGZD-EW-T05]
- Chinese Academy of Sciences
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Photocatalysts based on g-C3N4 by loading cocatalysts or constructing heterojunctions have shown great potential in solar-driven water oxidation. However, the intrinsic drawbacks of g-C3N4, such as poor mass diffusion and charge separation efficiency, remain as the bottleneck to achieve highly efficient water oxidation. Here we report a simple protonation method to improve the activity of g-C3N4. Studies using valence band X-ray photoelectron spectra and steady-state and time-resolved spectroscopy reveal that the promotion of catalytic ability originates from the higher thermodynamical driving force and longer-lived charge separation state, which may provide guidance in designing efficient polymeric semiconductor photocatalysts with desirable kinetics for water oxidation.
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