The effect of cell temperature on SO2 poisoning of polymer electrolyte fuel cells was analyzed. 2ppm of SO2 in air was supplied to the cathode of a single cell and the effect of SO2 on cell voltage was evaluated at a constant current of 1000mA/cm2. The cell temperature was varied from 75 to 90 °C. It was confirmed that the voltage drop caused by SO2 poisoning was decreased by elevating cell temperature. This temperature dependency was thought to be due to decreased SO2 adsorption, change of water balance, and SO2 diffusion behavior.

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A communication test was conducted to validate the safety of fueling using infrared communication devices. A fast-fueling test simulating the several conditions in actual use was also conducted with these devices. The test confirmed that infrared communication devices meet the performance requirements defined in SAE J2601 and that hydrogen gas fueling can be performed safely when infrared communications device are being used.

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We conducted hydraulic sequential tests of new domestic standard ''KHK S 0128'' for existing VH3 and VH4 tanks. No problem was found in carrying out these tests. No unexpected phenomena occurred in the VH4 tank. However, in the liner of the VH3 tank leaked. The temperature and pressure control regulations of the procedure are not detailed in the accelerated stress test, one of the sequential tests. The control procedure affects the results, so, it is necessary to investigate the influence of the temperature and pressure control procedure.

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We investigated methods for safely rescuing passengers when there is a hydrogen leak from a hydrogen vehicle by conducting experiments to examine the hydrogen diffusion of the circumference of vehicles with ventilation using an air blower. We also conducted an ignition test with ventilation. The test results confirmed that the area above 4% of the lower flammable limit with ventilation spreads rather than its area under windless condition. Moreover, the hydrogen leaking under the floor was hardly diffused. Therefore, the peak pressure of the blast when hydrogen ignited was large.

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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