Effect of temperature and humidity on the gas permeability of proton membranes for fuel cells
The gas permeation through the proton membrane of fuel cell not only reduces the fuel utilization rate of the fuel cell,but also directly affects the performance and service life of the fuel cell.Therefore,gas permeation rate has become an impor-tant indicator for evaluating membrane performance.To simulate the gas permeation status of hydrogen fuel cell membranes under operating conditions and to improve the efficiency of proton membrane gas permeation detection,a combination of pressure differ-ence method and gas chromatograph technology to test the hydrogen permeability of different types of fuel cell proton membranes was used through electromagnetic heating water vapor humidification method.The results of effect of different temperature and humidity conditions on the hydrogen permeability of fuel cell proton membranes were obtained.Meanwhile,a water-resistant chro-matographic column was used in gas chromatography and the detection of water vapor transmittance under different temperature and humidity conditions was realized simultaneously.The results indicate that temperature has a significant impact on the hydrogen permeability of fuel cell proton membranes and hydrogen permeability increases exponentially with the increase of temperature among different types of fuel cell membranes.At lower temperatures,relative humidity is linearly dependent on hydrogen permeabil-ity.The trend of hydrogen permeability increasing with increasing humidity slows down under high temperature conditions.The permeation of water vapor follows a similar pattern to that of hydrogen permeation,increasing with increasing temperature and humidity under different temperature and humidity.A relatively complete fuel cell membrane gas permeability detection system is established,achieving synchronous detection of hydrogen and water vapor,making up for the shortcomings of national standard testing methods by creating multiple technologies connected in series.
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