Enhanced Driving Force and Charge Separation Efficiency of Protonated g-C 3 N 4 for Photocatalytic O 2 Evolution
2015; American Chemical Society; Volume: 5; Issue: 11 Linguagem: Inglês
10.1021/acscatal.5b02185
ISSN2155-5435
AutoresChen Ye, Jiaxin Li, Zhijun Li, Xu‐Bing Li, Xiang‐Bing Fan, Liping Zhang, Bin Chen, Chen‐Ho Tung, Li‐Zhu Wu,
Tópico(s)Quantum Dots Synthesis And Properties
ResumoPhotocatalysts 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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