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

对聚合物电解质燃料电池中的纳/微孔电极（催化层）进行了研究，以阐明电极的制备过程和电极中的传质。原位和横截面可视化显示，多孔电极的纳米/微米结构受到施加到电极的制造过程中的成分的比例的强烈影响。研究了在干燥条件下施加压力和相对湿度对电极微裂纹产生的影响，并探讨了电极微裂纹产生的基本机理。结果表明，多孔电极中化学物种、离子和电子的传输现象对高性能燃料电池起主导作用，建议进一步改进纳米/微米多孔电极的设计和控制，以增强燃料电池中的传输过程。

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.