Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (8): 1606.doi: 10.7503/cjcu20190096

• Analytical Chemistry • Previous Articles     Next Articles

Mechanism of Electrochemical Capture of CO2 via Redox Cycle of 2-Amino-3-chloro-1,4-naphthoquinone in BMIMBF4

QIAO Xuejiao, LI Dan, CHENG Longjiu, JIN Baokang   

  1. School of Chemistry & Chemical Engineering, Anhui University, Hefei 230601, China
  • Received:2019-02-10 Revised:2019-07-23 Online:2019-08-10 Published:2019-07-12
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21375001).

Abstract: The mechanism of electrochemical capture of CO2 via redox cycle of 2-amino-3-chloro-1,4-naphthoquinone(ACNQ) in 1-butyl-3-methylimidazolium tetrafluoroborate(BMIMBF4) was investigated by cyclic voltammetry(CV) and in-situ Fourier transform infrared(FTIR) spectroelectrochemistry techniques. In the absence of CO2, ACNQ undergoes a reversible two-step one-electron process in BMIMBF4. The dianion(ACNQ2-) formed during electrochemical reduction can be used as nucleophiles to attack the eletrophilic carbon center of CO2 and form a stable CO2 adduct when CO2 is introduced. Furthermore, the stoichiometry of CO2 electrochemical capture was evaluated. The result indicates that 1 mol of ACNQ2- can capture 1 mol of CO2. Also, the possible structures of CO2 adducts in the reaction were calculated by the B3LYP method at the 6-311++G** level.

Key words: in-situ FTIR spectroelectrochemistry, 2-Amino-3-chloro-1,4-naphthoquinone(ACNQ), 1-Butyl-3-methylimidazolium tetrafluoroborate, CO2, Nucleophile

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