高等学校化学学报

高等学校化学学报

• 研究简报 • 上一篇    下一篇

CO2在铜电极上的电还原行为

张丽, 罗仪文, 钮东方, 肖丽平, 陆嘉星   

  1. 华东师范大学化学系, 上海市绿色化学与化工过程绿色化重点实验室, 上海200062
  • 收稿日期:2006-12-27 修回日期:1900-01-01 出版日期:2007-09-10 发布日期:2007-09-10
  • 通讯作者: 陆嘉星

Electrochemical Behavior of CO2 on Copper Electrode

ZHANG Li, LUO Yi-Wen, NIU Dong-Fang, XIAO Li-Ping, LU Jia-Xing*   

  1. Department of Chemistry, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, China
  • Received:2006-12-27 Revised:1900-01-01 Online:2007-09-10 Published:2007-09-10
  • Contact: LU Jia-Xing

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摘要：

对常温常压下的MeCN, DMF和DMSO等3种有机溶剂中的CO2的电还原反应行为进行了研究, 求得了传递系数和扩散系数, 并证明了在MeCN, DMF和DMSO中, CO2的还原反应是受扩散控制的不可逆过程.

关键词: CO2, 铜电极, 循环伏安法, 计时电量法

Abstract: The electrochemical reduction of CO2 on copper electrode was investigated in acetonitrile(MeCN), dimethyl formamide(DMF) and dimethyl sulfoxide(DMSO) containing 0.1 mol/L tetraethylammonium bromioe(TEABr) by cyclic voltammetry and chronocoulometry at 298 K and under atmospheric pressure. There were obviously irreversible one-electron reduction peaks after saturated with CO2 on copper electrode in three solvents, which generated anion radical of CO2. The influence of scan rate was also studied by cyclic voltammetry. The diffusion coefficients of CO2 in MeCN, DMF and DMSO were 8.981×10-6, 1.019×10-6 and 1.032×10-6 cm2/s and the transfer coefficients were 0.064, 0.042 and 0.059, respectively. These results show that the electroreduction of CO2 was an irreversible diffusion controlled process.

Key words: Carbon dioxide, Copper electrode, Cyclic voltammetry, Chronocoulometry

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