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Abstract: In the proceeding of the calculation on the diffusion overvoltage, the membrane water porosity is revised based on the fiducially air stoichiometric ratio and actual air stoichi-ometric ratio. The diffusion overvoltage is 0.06 V more than the result unrevised; It distinctly affects the model result. Mem-brane ionic conductivity is revised by using air stoichiometric ratio, the effect of water management on ohmic overvoltage is feeble correspondingly. A semi-empirical model of fuel cell is established based on the calculation of the thermodynamic postential and diversified overvoltages. Based on the model, the scale of active overvoltage, ohmic overvoltage and diffusion overvoltage are calculated under different current density; The simulation results show that ohmic overvoltage and diffusion overvoltage increase following the current density. Polarization experiment is carried on utilizing a fuel cell testbed and the simulation results are in good agreement with the experiment results.
Key words: Proton exchange membrane Fuel cell Water management
CLC No:
U473.4
国家高技术研究发展计划资助项目(863计划, 20075AA501100). Received 20061029, received in revised form 20070426
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