This study investigates the feasibility of using the relaxation response to a stepwise change in load current for real-time monitoring of hydrogen proton exchange membrane fuel cells. It is showing that the relaxation response is accurately described by a model consisting three exponential components. The results of experimental studies on an equivalent model system and a real fuel cell confirmed the effectiveness of the proposed relaxation-based monitoring method. Experimental evidence demonstrated that the slow exponential component of the proposed model enables the detection of hydrogen deficiency within the membrane–electrode assembly of the fuel cell.
Denisov et al. (Mon,) studied this question.