Hydrogen crossover permeability coefficient

Temperature affects hydrogen crossover mainly by affecting the hydrogen permeability coefficient, which is temperature dependent and can be expressed in an Arrhenius form [13] ... 

Several techniques can be used to measure the hydrogen crossover rate, including the volumetric method, time-lag technique, gas chromatography method, and the electrochemical monitoring technique. For example, by applying higher pressure at one side of the membrane, Sakai et al. [13] measured the H2 permeability coefficient in Nalion membranes by using the volumetric method. 

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