Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (10): 1667-1676.DOI: 10.1016/S1872-2067(21)63824-X

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“Environmental phosphorylation” boosting photocatalytic CO2 reduction over polymeric carbon nitride grown on carbon paper at air-liquid-solid joint interfaces

Qinghe Zhang, Yang Xia, Shaowen Cao()   

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China
  • Received:2021-03-03 Accepted:2021-04-08 Online:2021-10-18 Published:2021-06-20
  • Contact: Shaowen Cao
  • About author:Professor Shaowen Cao received his B.S. in Geochemistry in 2005 from the University of Science and Technology of China, and his Ph.D. in Materials Chemistry & Physics in 2010 from the Shanghai Institute of Ceramics, Chinese Academy of Sciences. He then worked as a Research Fellow at the School of Materials Science and Engineering, Nanyang Technological University until Feb. 2014. He is now a Professor at State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology. From Mar. 2018 to Feb. 2020, he was a Visiting Scientist at Max Planck Institute of Colloids and Interfaces. His current research interests include the design and fabrication of photocatalytic materials for energy and environmental applications. He is the author or co-author of more than 100 peer-reviewed scientific papers published on Chem. Soc. Rev., Joule, Adv. Mater., Angew. Chem. Int. Ed., Chin. J. Catal. etc., with over 12000 citations, an H-index 57 and 19 ESI highly cited papers. He is also one of the “Highly Cited Researchers” from 2018 to 2020 awarded by Clarivate Analytics. He joined the Editorial Board of Chin. J. Catal. as a young member in 2017.
  • Supported by:
    National Natural Science Foundation of China(51922081);National Natural Science Foundation of China(21773179)

Abstract:

The limited CO2 content in aqueous solution and low adsorption amount of CO2 on catalyst surface lead to poor photocatalytic CO2 reduction activity and selectivity. Herein, the design and fabrication of a novel photocatalytic architecture is reported, accomplished via chemical vapor deposition of polymeric carbon nitride on carbon paper. The as-obtained samples with a hydrophobic surface exhibit excellent CO2 transport and adsorption ability, as well as the building of triphase air-liquid-solid (CO2-H2O-catalyst) joint interfaces, eventually resulting in the inhibition of H2 evolution and great promotion of CO2 reduction with a selectivity of 78.6%. The addition of phosphate to reaction environment makes further improvement of CO2 photoreduction into carbon fuels with a selectivity of 93.8% and an apparent quantum yield of 0.4%. This work provides new insight for constructing efficient photocatalytic architecture of CO2 photoreduction in aqueous solution and demonstrates that phosphate could play a key role in this process.

Key words: Photocatalytic CO2 reduction, Hydrophobic surface, Air-liquid-solid triphase interfaces, Mass transport, Phosphorylation