PEFC過渡運転時の水バランス解析 : ガス拡散層諸元がサーペンタイン形流路PEFCの模擬起動運転時の濃度過電圧に与える影響(熱工学,内燃機関,動力など)

概要

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We have analyzed the dependence of the concentration overpotentials on the properties of gas diffusion layers (GDLs) of a polymer electrolyte fuel cell (PEFC) using dual serpentine flow fields during a start-up operation. Moreover, we directly and separately analyze such dependence of the amount of the water accumulated at each component of a cell by measuring the weight of adherent water. As a result, the hydrophobic treatment with micro porous layer addition to a GDL substrate is found to be effective to improve the cell performance by suppressing the water accumulation at the electrode (catalyst layer) which increases the concentration overpotential. Suppressed water accumulation at the electrode also increases cumulative current that represents the power generation and calorific power important for warm-up. Besides, increase in the coarseness of the GDL substrate is not so effective for decreasing the concentration overpotential and increasing the cumulative current for the case of the serpentine flow field. Increase in the thickness of the GDL substrate increases the concentration overpotential and decreases the cumulative current. These results will offer proper design parameters of GDLs for improving the performance of PEFCs, in particular during start-up.
社団法人日本機械学会の論文
2008-12-25