期刊
SUSTAINABLE ENERGY & FUELS
卷 1, 期 1, 页码 95-102出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6se00048g
关键词
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资金
- National University Research Fund [GK261001009]
- Changjiang Scholar and Innovative Research Team [IRT_14R33]
- 111 Project [B14041]
- Natural Science Foundation of China [21603136]
- National Key Research Program of China [2016YFA0202403]
- Young Talent fund of University Association for Science and Technology in Shaanxi [20150104]
- Fundamental Research Funds for the Central Universities [GK201602007]
- Chinese National 1000-Talent-Plan program
The effect of maximum incident light absorption, conversion and utilization by a semiconductor on solar fuel generation was investigated in this study. Sub-15 nm g-C3N4-TiO2 (CN-TiO2) was synthesized through a hydrothermal process at a relatively high temperature. Three samples with different TiO2 sizes, i.e. 9, 12 and 15 nm, were obtained by changing the pH of solution and named CN-TiO2-9, CN-TiO2-12 and CN-TiO2-15. Based on the Mie scattering law, the nano-sized heterojunction samples can achieve almost 100% incident light absorption without reflection. Characterization results from XRD and FTIR indicate that the samples are composed of protonated g-C3N4 and anatase TiO2. Further results from TEM images provide information on the size of the synthesized hybrid samples. It is established that the two components together show sub-15 nm particle size. The nano-sized heterojunction delivered considerable solar-to-hydrogen conversion efficiency with the apparent quantum yield (AQY) of 6.9% under 405 nm visible light irradiation. Moreover, it is interesting to find that the AQY values do not decrease when increasing the incident photon flux. The large absorption cross-section area and the prolonged lifetime of photogenerated carriers of the sub-15 nm CN-TiO2 heterojunction are the origin of the high photon-to-electron conversion.
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