Fuel Impurity Effects on High Temperature PBI Based Fuel Cell Membranes

摘要

The effects of key fuel gas impurities (CO and H2S) on the performance of high temperature PBI-based fuel cells were studied. Fuel cells with high temperature PBI-based MEAs (Celtec P-1000) showed excellent tolerance to CO (up to 2 %) at typical operational temperatures (160 – 180 °C). The fuel cell performance was very sensitive to CO content at lower operational temperatures (140 – 120 °C). Fuel cell performance was immediately recovered by switching back to pure hydrogen. Fuel cells with Celtec P-1000 MEAs showed good tolerance to 0.5 ppm H2S and limited tolerance to 25 ppm H2S at temperatures from 120 ° C to 180 ° C. The fuel cells also showed quick and almost full recovery when the anode gas was switched from 0.5 or 25 ppm H2S containing reformate back to pure hydrogen.