In the present contribution an experimental validation and a measurement routine of a new electrochemical method to study dynamics of electrochemical processes, the so-called concentration alternating frequency response analysis (cFRA) is presented. In cFRA the electrical response of the cell (current or potential) to periodic perturbation of specific reactant feeds is studied by means of linear system analysis. For the example of a polymer electrolyte fuel cell (PEMFC) we show that cFRA, in contrast to classical electrochemical impedance spectroscopy (EIS), detects selectively the effect of the dynamics of mass transport of reactants and products inside the different layers of the PEMFC. Moreover, cFRA can be used to diagnose the humidification state of the fuel cell cathode. Finally, procedures to improve the diagnostic skills of the proposed cFRA technique are discussed and directions of future work are recommended.

在本论文中，提出了一种用于研究电化学过程动力学的新型电化学方法的实验验证和测量程序，即所谓的浓度交替频率响应分析（cFRA）。在cFRA中，通过线性系统分析研究了电池对特定反应物进料周期性扰动的电响应（电流或电势）。对于聚合物电解质燃料电池（PEMFC）的示例，我们表明，与经典的电化学阻抗谱（EIS）相比，cFRA选择性地检测到PEMFC不同层内部的反应物和产物的质量传输动力学的影响。而且，cFRA可以用于诊断燃料电池阴极的加湿状态。最后，