高等学校化学学报

高等学校化学学报

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直接甲醇燃料电池动态行为的交流阻抗研究

黎家纯1,2, 谢晓峰2, 郭建伟2, 齐亮2, 周涛1   

    1. 中南大学化学化工学院, 长沙 410083;
    2. 清华大学核能与新能源技术研究院, 北京 100084
  • 收稿日期:2007-07-16 修回日期:1900-01-01 出版日期:2008-03-10 发布日期:2008-03-10
  • 通讯作者: 谢晓峰, 周涛

Research of AC Impedance of Dynamic Behavior of Direct Methanol Fuel Cell

LI Jia-Chun1,2, XIE Xiao-Feng2*, GUO Jian-Wei2, QI Liang2, ZHOU Tao1*   

    1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
    2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
  • Received:2007-07-16 Revised:1900-01-01 Online:2008-03-10 Published:2008-03-10
  • Contact: XIE Xiao-Feng, ZHOU Tao

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被引次数

28

摘要： 采用交流阻抗法(EIS)研究了直接甲醇燃料电池(DMFC)放电状态下的动态电化学行为及内部作用机理. 通过L1R1[QR2(L2R3)]形式的等效电路对其阻抗图谱进行了较好的模拟解析, 研究结果表明, 高频电感(L1)相关于EIS的测量过程; 系统电阻(R1)和电荷转移电阻(R2)随工作电流的升高均呈下降趋势, 但传质状况对其具有一定干扰; 低频电感(L2)和低频电阻(R3)随电流的升高均逐渐降低, 这共同反映出阳极甲醇的电氧化行为; 电极反应驱动力和内部传质共同决定常相位角元件Q的变化规律, 随着放电电流的升高, 电池内部表现出了由理想电容到浓差极化的中间过渡过程.

关键词: 直接甲醇燃料电池, 交流阻抗, 电感, 电阻, 传质

Abstract: Electrochemical Impedance Spectrum (EIS) was employed to investigate the dynamic behavior and interior mechanism of direct methanol fuel cell(DMFC) in working states. The spectrums were simulated through the equivalent circuit of L1R1[QR2(L2R3)], and the results show that the high inductance L1 was only related to the EIS measurement process. Meanwhile, the system resistance R1 and charge transfer resistance R2 was shown to decrease gradually but was affected by mass transfer at high discharging current. Both the low inductance L2 and low frequency resistance R3 in circuit reflected the adsorption/desorption balance of intermediate species originating form methanol oxidation reaction, which decreased with the discharge current increasing. The constant phase elements(CPE) Q in this circuit was mainly influenced by the driving forces of both reactions and mass transfer, and indicated that there existed a transition process from ideal capacitance to the charge transfer with the discharging current increasing.

Key words: Direct methanol fuel cell(DMFC), AC Impedance, Inductance, Resistance, Mass transfer

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