CRUZ-MANZO, S. and CHEN, R., 2013. A generic electrical circuit for performance analysis of the fuel cell cathode catalyst layer through electrochemical impedance spectroscopy. Journal of Electroanalytical Chemistry, 694, pp.45-55.
In this study, a generic electrical circuit is presented to characterise the frequency response of the Polymer Electrolyte Fuel Cell (PEFC), Cathode Catalyst Layer (CCL) at different current densities. The new electrical
circuit is derived from fundamental electrochemical and diffusion theory. It consists of a
transmission line in combination with distributed Warburg elements. The validation of this study is
divided into a theoretical validation and an experimental validation. In the theoretical validation the
impedance response of the CCL generated from three different circuits reported in the literature was
compared with the simulated data from the generic electrical circuit. In the experimental validation, Electrochemical
Impedance Spectroscopy (EIS) measurements were carried out in an H2/air PEFC through a
three-electrode configuration in the measurement system and were compared with the simulated data
from the generic circuit. The results show that the generic circuit is able to accurately reproduce the measured
data of the CCL at different current densities and is able to represent the electrochemical and diffusion
mechanisms of the CCL in the frequency domain. It is possible to generate a deeper understanding
of how and where the chemical energy that is released from the redox reaction is being dissipated and
retained within the real physical system.
The authors thank the Mexican National Council for Science and
Technology (CONACYT) for the sponsorship of the Ph.D research
study of S. Cruz-Manzo (Grant No. 183195).