Journal
JOURNAL OF CO2 UTILIZATION
Volume 33, Issue -, Pages 233-241Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2019.05.016
Keywords
Photocatalysis; CO2 reduction; g-C3N4; alpha-Fe2O3; Z-scheme
Funding
- Key Project of Chinese National Programs for Research and Development [2016YFC0203800]
- National Natural Science Foundation of China [51578288]
- Jiangsu Province Scientific and Technological Achievements into a Special Fund Project [BA2016055, BA2017095]
- Jiangsu Province Scientific and Technological Project [BK20180449]
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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In this study, a series of alpha-Fe2O3/g-C3N4(FCN) photocatalysts for CO2 reduction at 0.6 MPa to produce CH3OH is synthesized via hydrothermal method and the FCN hybrid shows greater absorption of visible light than pure g-C3N4 due to the introduction of alpha-Fe2O3 (narrow bandgap). The Z-scheme heterojunction promotes photogenerated electron and hole separation and suppresses the recombination of photoexcited electron-hole pairs. Benefiting from this unique structure, the optimized FCN(40:60) hybrid shows a CH3OH evolution rate of 5.63 mu mol g(-1) h(-1) without any sacrifice reagent and cocatalyst, which is 2.9 times higher than that of pure g-C3N4(1.94 mu mol g(-1) h(-1)). The excellent activity is ascribed to a Z-scheme transfer mechanism, which is proposed according to the band structure between g-C3N4 and alpha-Fe2O3. The results gained here may provide some illuminating insights for the design of new types of Z-scheme photocatalysts.
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