インピーダンス法によるPEFC過電圧解析方法の研究 : 第3報,拡散層の特性が各部過電圧に与える影響(熱工学,内燃機関,動力など)

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PEFC was simulated with an equivalent circuit having four resistances and three capacitances whose values were estimated by AC impedance method, and each overvoltage (OV) of which total OV consists was then calculated by integral calculus from current density i for each resistance R. This method enables us to investigate influence of characteristics of gas diffusion layers (GDL) upon each OV that varies with relative humidity of supplied gas. As a result, cathode activation OV was found to decrease using GDL with micro porous layer (MPL) at any humidity. In addition, using different types of GDL, cathode concentration OV was found to decrease due to efficient gas diffusion in GDL at high humidity, and due to air permeability at low humidity. Moreover, ohmic resistance of PEFC obtained by AC impedance method decreased with increase of i at humidity under saturation. This result suggests that humidity of membrane electrode assembly (MEA) depends on i at humidity under saturation. The above results will offer design of efficient GDL, which improves PEFC performance.
社団法人日本機械学会の論文
2007-01-25