The microstructure and the elementary steps of the direct methanol fuel cell (DMFC) anode are investigated using an advanced equivalent circuit. A serial circuit of two parallel circuits of resistance and capacitance, which is in parallel with a Faradaic impedance, is introduced to simulate the anodic reaction. Three processes with different anode polarization dependencies are clearly reproduced by the simulation using this equivalent circuit, and they are considered to be interfacial resistance representing the transport of ions through the electrode pores, electrooxidation reaction of the anode, and another process parallel to the reaction intermediate. The anode polarization dependence of the interfacial resistance and the change in the distortion was better explained by the modified equivalent circuit than by the conventional equivalent circuit using a constant phase element (CPE) with unfixed exponent. The relationship of the interfacial resistance with catalyst loading or electrode thickness was clarified using this equivalent circuit.
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