膜電極組添加SiO2對質子交換膜燃料電池操作在低相對濕度之研究

Membrane-electrode Assembly by Adding SiO2 in PEMFC Under Low Relative Humidity

邱創麟(Chuang-ling Chiu)

指導教授 ： 蘇艾

元智大學/工程學院/機械工程學系/碩士(2011年)

摘要

質子交換膜燃料電池系統為了保持性能與耐用性，需要水來維持其操作過程中的離子導電度，為了使質子交換膜燃料電池系統操作在較適當的環境，通常會在系統內裝置增濕器，但為了減輕系統重量、空間及簡化系統，因此希望能開發在無外部增濕的條件下，讓質子交換膜燃料電池能順利運行。
本研究將二氧化矽添加於觸媒層及氣體擴散層上，藉由二氧化矽的親水性，使電池較易操作於在低相對濕度的條件下，而研究發現些許的二氧化矽添加，使得膜材能保留較多水分，對電池操作在低相對濕度條件下能有較佳性能，但研究發現添加過量的二氧化矽會造成水分不易排出，導致氣體不易進入觸媒層，進而影響電池性能。

關鍵字

二氧化矽 ； 氣體擴散層 ； 觸媒層 ； 低相對濕度

並列摘要

xchange membrane fuel cell needs water sufficient to keep its ionic conductivity. However, the proper environment for proton exchange membrane fuel cell demands an interior humidifier. This experiment tried to decrease the weight, and to simplify the system, which still make possible the operation of the proton exchange membrane fuel cell even without external humidifying.

This study had silica added to the catalyst layer and gas diffusion layer; the hydrophilicity of silica makes battery likely to operate in the condition of low relative humidity. Besides, the addition of silica has membrane keep more humidity, which led to better operation of the battery under low relative humidity. However, the study also led to the result that too much silica would have humidity stuck within, and have air find no easy access to the catalyst layer—both of these would affect the efficiency of battery.

並列關鍵字

silica ； gas diffusion layer ； catalyst layer ； low relative humidity

參考文獻

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