전기화학 임피던스분석 방법을 통한 연료전지 연구

Proton exchange membrane fuel cell (PEMFC) is a complicated electrochemical system. Performance of fuel cell depends on many factors of internal phenomena such as oxygen reduction reaction (ORR), ionic transport, and water diffusion. The responses by some properties or processes take place at different frequency range because the time scales of each reaction are different. The best way to observing the factors are measured based on the frequency change of fuel cell under wide frequency range without disturbing fuel cell operation. In this study, the non-invasive diagnostic technique is established using an electrochemical impedance spectroscopy (EIS). The frequency response of a single cell is measured by the EIS technique. In the result of frequency response, Nyquist and Bode plot are earned. By using Nyquist and Bode plot, equivalent circuit model is going to built for accurately analyzing activities of each factors in the homemade single cell in the DGIST.