Analysis of transport phenomena in nano/micro porous electrodes for polymer electrolyte fuel cells by high-resolution in situ approaches.

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Investigations on nano/micro porous electrode (catalyst layer) in polymer electrolyte fuel cells were conducted to clarify fabrication process and mass transfer in the electrodes. In situ and cross-sectional visualizations revealed that nano/micro structures of porous electrodes were intensively affected by ratio of ingredients applied to the fabrication process of the electrode. Influences of applying pressure by decal method and relative humidity under drying condition were also examined with fundamental mechanism for generations of micro cracks in the electrode considered. It was shown that transport phenomena on chemical species, ions and electrons in the porous electrode played a dominant role for high performance fuel cell, suggesting further improvements on design and control of the nano/micro porous electrode to enhance transport process in fuel cells.