J0802-1-6 PEFCの過電圧に対する膜電極接合体界面の影響([J0802-1]PEFC)

概要

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In polymer electrolyte fuel cells (PEFCs), voltage losses are induced by activation of hydrogen and oxygen gases, ohmic resistance of electrolyte membranes, and contact resistance of electrode-electrolyte interfaces. In the present study, we develop an original model to discuss the relationship between proton transfer and overpotential in polymer electrolyte fuel cells in terms of a microscopic viewpoint. The overpotential is caused by the energy loss of protons during passing through electrodes, electrolyte, and those interfaces. In our model, protons which are in the statistical ensemble move each layer getting across the interfaces. Potential barriers at the interfaces between electrodes and electrolyte membranes are assumed to disturb the protons flow. The energy dissipation process is considered under the condition of constant current density, where accelerated protons get to their stationary state, colliding with the surroundings and decaying their momenta. Using this model, overpotentials focusing on the electrode-electrolyte interface conditions are evaluated quantitatively and are compared with experimental results. Consequently, it is clarified that our theoretical model well explains the mechanisms of ohmic overpotential and concentration overpotential observed in PEFCs.
一般社団法人日本機械学会の論文
2010-09-04