基于电化学阻抗法的质子交换膜燃料电池“三步活化法”机理研究

活化能够有效地发挥质子交换膜燃料电池膜电极的性能,"三步活化法"是其中一种比较理想的方法。为了研究"三步活化法"活化质子交换膜燃料电池的机理,利用电化学阻抗谱测试"三步活化法"过程中的膜电极阻抗,并建立等效电路模型拟合所得实验数据。结果表明,"三步活化法"可以有效降低欧姆阻抗、阳极法拉第阻抗、阴极法拉第阻抗以及阴极传质阻抗,这表明"三步活化法"有利于电子、质子、气体与水的传输通道的形成。

Application of electrochemical impedance spectroscopy to mechanism study of three-step activation of proton exchange membrane fuel cell

Activation can effectively exert the performance of the proton exchange membrane fuel cell, and the three-step activation is one of the ideal methods. In order to study the mechanism of the three-step activation, the impedances of the membrane electrode assembly during three-step activation were tested by electrochemical impedance spectroscopy (EIS) and were fitted by the equivalent circuit model. The results showed that three-step activation could effectively reduce the ohmic impedance, the anode Faraday impedance, the cathode Faraday impedance and the cathode mass transfer impedance, indicating that the method was beneficial to the formation of electron, proton, gas and water transport channels.