燃料電池複合雙極板製程及其性質研究

Preparation and Characterization of the Fuel Cell Composites Bipolar Plate

周崇吉(Chung-Chi Chou)

指導教授 ： 徐澤志

共同指導教授 ： 林俊源

元智大學/工程學院/機械工程學系/碩士(2008年)

摘要

本研究主要探討燃料電池中的雙極板，由於其體積過大，且流道須經過二次加工，而會使雙極板的成本增加，故而利用塊狀模鑄成形法直接熱壓出複合雙極板材料，熱壓成形主要是利用樹脂添加石墨粉形成塊狀材料，雙極板不須要經過二次加工，經設計之流道在模具上經熱壓成形之後，流道直接結合在材料上。主要是利用兩種不同石墨粉比例來製成複合雙極板材料，探討兩種不同比例的複合的性質。奈米碳管是良好的管狀結構和電的良導體，分別以不同比例的量加入複合材料中，使奈米碳管平均分散在複合材中，且量測其抗彎曲強度、耐衝擊強度、孔隙度和體積導電率等實驗數據，最後得知在複合材料中加入奈米碳管可降低複合材的孔隙度、同時提升材料的機械性質和導電性質。

關鍵字

燃料電池 ； 複合雙極板 ； 奈米碳管

並列摘要

The technique of fuel cells is still in the developing stage and there are many difficulties needed to be overcome. One of the difficulties is resulted from the large size of the fuel cell’s bipolar plate and the flow that needs a second processing, which would increase the cost. Therefore, the aim of the present experiment is to enhance the efficacy of the bipolar plate materials by using the method of bulk-moulding compound (BMC) that hot presses the composites bipolar plate materials. The hot press forming mainly makes use of combining resin with graphite to produce bulk materials. After the hot pressing, which shapes the flow on the mold, the materials can directly bond with the designed flow. In this way, it is unnecessary for the bipolar plate to have a second processing. This experiment employed two different kinds of graphite percentages to produce the materials for composites bipolar plate, and further investigated the characterizations of these two kinds of percentages. Because carbon nanotubes have suitable tubular structures and are good electric conductors, the present experiment added carbon nanotubes into the composites materials with different percentages and made these carbon nanotubes dispersed in the materials to measure the experiment data of bending strength, impact strength, porosity and bulk electrical conductivity, etc. Results indicated that adding carbond nanotubes into the composite materials can not only reduce the porosity of such materials, but also enhance its mechanical properties and conductive properties.

並列關鍵字

fuel cell ； composites bipolar plate ； carbon nanotubes

參考文獻

[16] 翁振豪, “以介電泳法對奈米碳管進行排列與應用”, 元智大學機械工程研究所, 2007

[1] James Larminie, Andrew Dicks, “Fuel Cell Systems Explained”, John Wiley, 2001

[2] Wilson ; S. Mahlon “Composite bipolar plate for electrochemical cells ” WO00/25372, 2000

[5] S. Kamaruzzaman, R. Wan, D. Wan, “Challenges and future developments in proton exchange membrane fuel cells” Renewable Energy 31 719–727, 2006

[6] E. A. Cho, U. S. Teon; H. Y. Ha, S. A. Hong, T. H. Oh., “Characteristics of composite bipolar plates for polymer electrolyte membrane fuel cells”, Journal of Power Sources, 125, p178-182, 2004