Development of fuel cell products must consider multiple factors such as temperature,humidity,trigger,etc. This study developed a gas diffusion layer using multi-layer microporous layer to achieves the effect of hydrophobic gradi-ents,making it easy for the fuel cell to operate in low humidity environments.Characterizations showed that the thickness of the prepared MMPL is between 260～270 μm,and the gas permeability is about 145 s.Battery polarization tests showed that the sample can maintain a power output of 477 mW/cm2 in 50％ relative humidity environment,with an at-tenuation of only 23％ compared to 100％ humidity environment.By utilizing the hydrophilicity of SiO2 ,the addition of 5％ wt SiO2 can further expand the humidity application range of the cell,which can operate in extremely low humidity (40％)environment and output a power density of 428 mW/cm2 ,only 25％ lower than that under 100％ humidity envi-ronments.
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维普
