Effects of temperature, pressure and humidity on the performance of proton exchange membrane fuel cells
WANG Wen-dong, CHEN shi, WU feng (Laboratory of National Development Center of Hi-Tech Green Materials, School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081)
In this work, the performance of a single proton exchange membrane fuel cell (PEMFC) with Nafion membrane 112 was studied in terms of different transport parameters such as cell temperature, pressure and humidity of the reaction sides. Current-voltage, current-power curves were presented. The energy-conversion efficiency of PEMFC was calculated and the short-time stability for PEMFC was also investigated by voltage-time curves at constant current discharge. The optimum operating conditions were thus obtained. Experimental results and calculation show that the maximum power density of the PEMFC is 0.7 Wcm-2 with Tcell=72℃, 22OHPP= =0.2 MPa and saturated reaction gas. The energy-conversion efficiency is 34% to 62% at a power density about 0.7 Wcm-2 to 0.3 Wcm-2, and the cell is much less sensitive to current density changes.