A Study Regarding Effects of Proton Exchange Membrane Fuel Cell Poisoning Due to Impurities on Fuel Cell Performance

摘要

In order to assess the effect of PEM-FC poisoning resulting from impurities on PEM-FC performance, this paper investigated contents as follows: -^sEstimation for composition and concentration of impurities contained within hydrogen fuel and air. -^sThe prediction of poisoning extent and proposal of assessment index for impurity poisoning. -^sAllowable mixing concentration of impurities for the standard H{sub}2 fuel. The analysis and experiment are conducted under 70°C and 1 bar for operating temperature and pressure. PEM-FC with Pt and Pt-Ru type catalytic-electrode was used. It was observed that: CO poisoning was reversible but H{sub}2S and SO{sub}2 poisonings were irreversible. It was also confirmed that sulfur compounds poisoning was very strong. On the contrary, poisoning of HCHO and CH{sub}4, etc., was slight or negligible. In case of cathode electrode, the effect of NO{sub}2 and SO{sub}2 poisoning on PEM-FC performance was severe when CO poisoning was negligible.