Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (11): 20230245.doi: 10.7503/cjcu20230245

• Physical Chemistry • Previous Articles     Next Articles

Performance and Mechanism of Graphene-carbon Felt Composited Gas Diffusion Cathode for Hydrogen Peroxide Electrochemical Production

HU Hongsu, SHEN Chuanzhe, WANG Yuhang, WANG Qingqing, HE Shilong(), LI Peng()   

  1. School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221008,China
  • Received:2023-05-22 Online:2023-11-10 Published:2023-08-21
  • Contact: LI Peng E-mail:hslongrcees@163.com;lipengch@cumt.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52104173);the Basic Research Programs Foundation of Jiangsu Province of China(BK20210519)

Abstract:

Graphene and Ketjen black composite carbon felt gas diffusion cathodes were prepared by impregnation-sintering by adjusting the amount of anhydrous ethanol, the mass ratio of graphene to polytetrafluoroethylene (PTFE), sintering temperature and other factors during method, and their microstructure and H2O2 electrochemical catalytic performance were compared. Due to the scaly microstructure and abundant oxygen-containing functional groups, graphene-carbon felt composite cathode has higher H2O2 yield than Ketjen black-carbon felt composite cathode. The H2O2 catalytic performance of graphene-carbon felt composite cathode was improved by regulating the preparation process, and the response mechanism of different manufacture parameters on the H2O2 catalytic performance of graphene-carbon felt composite cathode was studied by means of linear sweep voltammetry(LSV), electrochemical impedance spectroscopy(EIS), Fourier transform infrared spectroscopy(FTIR), X-ray photo- electron spectroscopy(XPS) and other testing methods. The research results show that when the addition amount of anhydrous ethanol is 60 mL, the mass ratio of graphene to PTFE is 3∶1, and the sintering temperature is 360 ℃, the prepared cathode has high conductivity and high surface C=O functional group content. After 90 min of electro-chemical reaction, the cumulative concentration of H2O2 can reach 427.63 mg/L. This cathode has strong cycling stability and high H2O2 generation efficiency, which has significant advantages over the widely used carbon black/ PTFE cathode. It is anticipated that this work could provide a theoretical basis and technical method reference for the efficient electrochemical production of H2O2 of gas diffusion cathodes based on graphene.

Key words: Graphene, Carbon felt, Gas diffusion cathode, H2O2, Electrocatalysis, Current efficiency

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