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In order to assess the effect of PEM-FC poisoning resulting from impurities on PEM-FC performance, this paper investigated contents as follows; · Estimation for composition and concentration of impurities contained within hydrogen fuel and air. · The prediction of poisoning extent and proposal of assessment index for impurity poisoning. · Allowable mixing concentration of impurities for the standard H2 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 H2S and SO2 poisonings were irreversible. It was also confirmed that sulfur compounds poisoning was very strong. On the contrary, poisoning of HCHO and CH4 etc. was slight or negligible. · In case of cathode electrode, the effect of NO2 and SO2 poisoning on PEM-FC performance was severe when CO poisoning was negligible.

In this study, the series hybrid electric system is recommended as suitable power systems of the motor vehicles in urban area. It is important for this system to improve the comprehensive energy efficiency when components are combined, and to evaluate it appropriately. In this report, the technique to grasp energy loss in detail that occurs when electric power flows complicatedly in the series hybrid power system has been examined and the energy efficiency of the series hybrid power system on urban driving has also been evaluated.

A very small electric vehicle, powered with a proton exchange membrane fuel cell operating on reformed methanol, is planned and designed in this paper to solve social problems associated with air pollution and heavy traffic conditions. Next, the driving range is simulated by the experimental data of the output and the performance. The conclusions of this paper are as follows: (1) The power train employing the fuel cell and compact brushless DC motor serves to realize high efficiency and reduce weight for energy saving.