Chinese Journal of Catalysis ›› 2023, Vol. 49: 160-167.DOI: 10.1016/S1872-2067(23)64433-X

Previous Articles     Next Articles

Enhancing CO2 photoreduction via the perfluorination of Co(II) phthalocyanine catalysts in a noble-metal-free system

Zizi Lia, Jia-Wei Wanga,b,*(), Yanjun Huanga, Gangfeng Ouyanga,c,d,*()   

  1. aKLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, Guangdong, China
    bInstitute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST), Avinguda Paisos Catalans 16, Tarragona 43007, Spain
    cChemistry College, Center of Advanced Analysis and Gene Sequencing, Zhengzhou University, Zhengzhou 450001, Henan, China
    dGuangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Guangdong Institute of Analysis (China National Analytical Center Guangzhou), Guangzhou 510070, Guangdong, China
  • Received:2023-03-01 Accepted:2023-03-16 Online:2023-06-18 Published:2023-04-04
  • Contact: *E-mail: wangjw25@mail2.sysu.edu.cn (J.-W. Wang),cesoygf@mail.sysu.edu.cn (G. Ouyang).
  • Supported by:
    National Natural Science Foundation of China(21737006);National Natural Science Foundation of China(22076222);National Natural Science Foundation of China(22036003);Guangdong Basic and Applied Basic Research Foundation(2020A1515110017);Guangdong Basic and Applied Basic Research Foundation(2021A1515012033)

Abstract:

The manufacture of high-performance photocatalytic systems based on earth-abundant elements remains a key challenge, urging operative strategies for catalyst design. Herein, we present the construction of an efficient and noble-metal-free molecular system for the photoreduction of CO2 to CO using a Cu(I) photosensitizer and Co(II) phthalocyanine catalysts. It was found that the perfluorination of Co(II) phthalocyanine shows enhanced catalytic performance for CO2-to-CO conversion compared with pristine Co(II) phthalocyanines, achieving a remarkable apparent quantum yield of 58.2% at 425 nm, which is three times that of the pristine one (19.0%). The Cu(I)/Co(II) system also achieved a maximum turnover number of 9185 and near-unity selectivity. These improvements can be attributed to the electron-withdrawing effect of the fluorine substituents, which lowers the catalytic overpotential for catalysis and decreases the Gibbs free energy of the rate-determining Co-carboxylate-forming step. This work indicates that perfluorination is an effective approach to optimize the catalytic performance of molecular catalysts.

Key words: Cobalt phthalocyanine, Photocatalytic CO2 reduction, Copper photosensitizer Perfluorination, Electronic modification