中溫PTFE/Nafion/TEOS膜之燃料電池在不同相對溼度操作之研究

Research of middle temperature PTFE/Nafion/TEOS membranes operating with different relative humidity

彭兆君(Zhao-Jun Peng)

指導教授 ： 翁芳柏

元智大學/工程學院/機械工程學系/碩士(2007年)

https://doi.org/10.6838/YZU.2007.00084

摘要

本文研究以加入四乙基矽烷(tetraethoxysilane, TEOS)為新材料之自製薄膜PTFE/Nafion/TEOS（PNS膜)為PEMFC的新膜材，探討不同相對濕度（25%R.H. ~100%R.H.）之下，分別比較有無含TEOS之自製膜（HT-PNS膜與HT-PN膜）、高低溫電極片膜（HT-PNS膜與LT-PNS膜）之性能比較。最後對自製膜（PNS膜）在有無背壓的環境下的性能和長時間穏定性探討。
比較自製膜有無含TEOS膜及高低溫電極片的性能時，在中溫低相對濕度時HT-PNS膜的性能皆高於HT-PN膜以及LT-PNS膜的性能，證明使用這些材料時的確有助於電池操作在中溫時性能的提升。HT-PNS膜在任何的溫度和壓力下，當相對濕度越高時電池的性能也會跟著增加。雖然加入TEOS可以提升膜材的含水性但是卻也會降低膜材的導電度，所以在25%R.H.時電池的性能並不是很好。在長時間穏定方面，在背壓下可連續操並且穩定操作50個小時以上。

關鍵字

中溫 ； PEMFC ； GDE ； TEOS ； 相對濕度

並列摘要

The research is to add TEOS to the membrane and then the new one is called PTFE/Nafion/TEOS (PNS). The content is to discuss different relative humidity (25%RH~100%RH) and then compare the performance about the membranes with TEOS and without TEOS (HT-PNS and HT-PN) and GDES of high temperature and low temperature. In the end, discussing the stability during long time and the property in the surroundings with backpressure and without backpressure.
In the process to compare the performance of new membranes with TEOS and without TEOS and the GDE at medium temperature, founding the performance of HT-PNS is better than the performance of HT-PN and LT-PNS. The result is to prove that using these materials is benefit to elevate the property when operating the cell at medium temperature.
When elevating the relative humidity and then the performance enhance in spite of any temperature and pressure. To add TEOS can lift the ability of content in the membrane but decrease the conductivity of the membrane, so
the performance is not good at 25% RH. In the respect of stability during long time, the cell can be operated continuously more than fifty hours with backpressure.

並列關鍵字

Medium Temperature ； PEMFC ； GDE ； TEOS ； Relative Humidity

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