高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (11): 20230245.doi: 10.7503/cjcu20230245

• 物理化学 • 上一篇    下一篇

石墨烯复合多孔碳毡气体扩散阴极的H2O2催生性能与机理

胡宏苏, 申传喆, 王宇航, 王青青, 何士龙(), 李鹏()   

  1. 中国矿业大学环境与测绘学院,徐州 221008
  • 收稿日期:2023-05-22 出版日期:2023-11-10 发布日期:2023-08-21
  • 通讯作者: 李鹏 E-mail:hslongrcees@163.com;lipengch@cumt.edu.cn
  • 作者简介:何士龙, 男, 博士, 教授, 主要从事水污染控制及微生物研究. E-mail: hslongrcees@163.com
  • 基金资助:
    国家自然科学基金(52104173);江苏省基础研究计划青年基金(BK20210519)

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)

摘要:

采用浸渍-烧结法分别制备了石墨烯和科琴黑复合碳毡气体扩散阴极, 对其微观形貌及电化学H2O2催生性能进行对比研究, 发现石墨烯-碳毡复合阴极具有显著鳞片状微观结构及表面丰富的含氧官能团, 其H2O2产率远高于科琴黑-碳毡复合阴极. 通过调控石墨烯-碳毡复合阴极制备过程中无水乙醇的添加量、 石墨烯/聚四氟乙烯(PTFE)质量比及烧结温度等条件, 提升石墨烯-碳毡复合阴极H2O2的催生性能. 采用线性扫描伏安法(LSV)、 恒电位阻抗法(EIS)、 傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)等测试手段, 研究了不同制备条件对石墨烯-碳毡复合阴极H2O2催生性能的响应机理. 结果表明, 当无水乙醇的添加量为60 mL, 石墨烯与PTFE质量比为3∶1, 烧结温度为360 ℃时, 制备的阴极导电性较好, 表面C=O官能团含量高, 经90 min电化学反应后, H2O2累积浓度可达427.63 mg/L. 该阴极循环稳定性强、 H2O2催生效率高, 较目前广泛采用的碳黑-PTFE阴极具有显著优势.

关键词: 石墨烯, 多孔碳毡, 气体扩散阴极, 双氧水, 电催化, 电流效率

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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