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Semiconductor/Covalent-Organic-Framework Z-Scheme Heterojunctions for Artificial Photosynthesis |
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| Authors: | Mi Zhang Meng Lu Dr Zhong-Ling Lang Dr Jiang Liu Ming Liu Jia-Nan Chang Le-Yan Li Lin-Jie Shang Min Wang Prof Shun-Li Li Prof Ya-Qian Lan |
| Institution: | 1. Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, No. 1, Wenyuan Road, Nanjing, 210023 China
These authors contributed equally to this work.;2. Key Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, 130000 P. R. China These authors contributed equally to this work.;3. Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, No. 1, Wenyuan Road, Nanjing, 210023 China |
| Abstract: | A strategy to covalently connect crystalline covalent organic frameworks (COFs) with semiconductors to create stable organic–inorganic Z-scheme heterojunctions for artificial photosynthesis is presented. A series of COF–semiconductor Z-scheme photocatalysts combining water-oxidation semiconductors (TiO2, Bi2WO6, and α-Fe2O3) with CO2 reduction COFs (COF-316/318) was synthesized and exhibited high photocatalytic CO2-to-CO conversion efficiencies (up to 69.67 μmol g?1 h?1), with H2O as the electron donor in the gas–solid CO2 reduction, without additional photosensitizers and sacrificial agents. This is the first report of covalently bonded COF/inorganic-semiconductor systems utilizing the Z-scheme applied for artificial photosynthesis. Experiments and calculations confirmed efficient semiconductor-to-COF electron transfer by covalent coupling, resulting in electron accumulation in the cyano/pyridine moieties of the COF for CO2 reduction and holes in the semiconductor for H2O oxidation, thus mimicking natural photosynthesis. |
| Keywords: | CO2-Photoreduktion Halbleiter Kovalente organische Gerüste Künstliche Photosynthese Z-Schema |