质子交换膜燃料电池局部电流测定方法分析

Subcell approach is a general approach for PEMFC local current measuring which divides a fuel cell plate into a number of elements and measuring separately. In the approach, if only current collector were segmented, there would be lateral current in the unsegmented diffusion layer, which would bring error for the measurement. While the segmentation of the diffusion layer could not only result in the difficulty in MEA preparation but also lead to the unparallel property of the subcells and the unequivalence to a whole plate. In this paper, the influence of the lateral current in the unsegmented diffusion layer to the local current measurement was discussed using an equivalent circuit. The results reveal that the lateral current is small when the contact resistance between the current collector and the diffusion layer is relatively small, so the unsegmented diffusion layer could be adopted in the local current measurement.