不同還原劑製備電極觸媒層對於PEMFC效能影響

Preparation and performance of electcatalitic layer of MEA in PEMFC under the different reductant

謝志先(Chih-Hsien Hsieh)

指導教授 ： 邱青煌

國立虎尾科技大學/工程學院/材料科學與綠色能源工程研究所/碩士(2009年)

https://doi.org/10.6827/NFU.2009.00084

摘要

本篇論文探討的是以含浸法還原Pt前驅物H2PtCl6，並用MWCNT做為金屬離子之載體。實驗中所使用的還原劑分別為乙二醇、甲酸、NaBH4。
在本實驗中，成功使用三種還原劑合成了Pt/CNT電極觸媒，並塗佈於陰陽兩極的Pt/CNT觸媒劑量約為3mg/cm2，最終製成MEA進行單電池測試。測試結果顯示當以低電流進行拉載，發現商用與自製觸媒效能反應並無太大差異；以高電流拉載時碳管製備的觸媒效能則較差，推測為Pt/C的活化表面積較大故觸媒反應的三相點較Pt/CNT多為主因。實驗結果以甲酸為還原劑製作的Pt/CNT電極觸媒有較好的輸出性能表現。
熱壓溫度、壓力及時間都會對製備出的MEA效能有影響。因此，有效控制上述變因，將是提升膜電極效能的重要條件。

關鍵字：燃料電池、膜電極組（MEA），浸漬還原法、熱壓壓製

關鍵字

燃料電池 ； 膜電極組(MEA) ； 浸漬還原法 ； 熱壓壓製

並列摘要

Using impregnation-reduction method to prepare the electrodes is convenient, economic, and easily controlled. The objective of this research was to prepare the electrodes for proton exchange membrane fuel cells using Impregnation-reduction method with three different reductants. The process of this work was divided into two steps. The first step was to use Enhylene glycol, Formic acid, NaBH4 ehthylene glycol as the reductants respectively to reduce hexachlorplatinic acid into Pt nanoparticles. Dispersion stability of the Pt nanoparticles on multi-walled carbon nanotube was examined respectively by changing the reductants volumetric fractions and analysed by Field Emission Scanning Electron Microscopy (FESEM). The second was to prepare Membrane and Electrode Assembly(MEA) by appling the directly spraying catalyst on the membrane, which was then sandwiched with carbon papers, and hot pressed by changing temperature and pressure. The MEAs prepared by different ways were sandwiched with the bipolar plates to assemble a single fuel cell. Finally the fuel cell was tested on fuel cell station. The result indicated that the performance of MEA prepared by using Formic acid as the reductants was the better than using the other reductants.
The comparisons of performance for fuel cell in self-manufacturing MEA and commercial MEA indicated that the former outperforms within current density 1400 mA/cm2. It was proved that Impregnation-reduction method was available on the MEA of PEMFC by way of these test results.
Keywords；Fuel cell、MEA、Hot-pressuring、impregnation-reduction

並列關鍵字

Fuel cell ； MEA ； Hot-pressuring ； impregnation-reduction

參考文獻

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