質子交換膜型燃料電池薄膜電極組乾式吸附法製程之研究

薄膜電極組製造成本高昂是燃料電池商品化的一項障礙，本文所提出之MEA新式製作方式採用乾式製程配合粉末吸附與擴散機制將可縮短MEA之製作流程，達到簡化製程之主要目的進而降低生產成本。在本文中MEA之製作過程因大量減少有機溶劑的使用，在製作過程中也避免了傳統濕式製程中烘乾程序所耗費之時間，也因此在完整之製作過程中所需之時間將可大大的被縮短， MEA之組成結構如同三明治般的結合型態，主要是由氣體擴散基材、碳粉、PTFE、觸媒、Nafion 所組合而成，在製作過程中各種材料的含量與特性上些微的差異，在MEA之性能表現上將會有重大的影響。在起體擴散背層中PTFE之含量約在40wt% 搭配具有較大表面面積之碳粉Ketjen Black EC600相較於Acetylene black 與 Ketjen Black EC300 可以得到較好的性能表現，在觸媒層的製備上由於吸附壓力與氮氣流量將會明顯影響觸媒層之吸附結果，由實驗結果得到當吸附壓力在12公分水柱高配合4L/min之氮氣流量將可得到明顯較高的性能表現必v密度約在0.21W/cm2，在吸附過程中觸媒塗佈量控制在0.4~0.5mg/cm2。本文所提出之乾式製備方法採用吸附方式配合粉末擴散機制，提供了一種簡易、快速且可靠的MEA製作方式，並達到了快速製作與減少製作成本之目的。

關鍵字

性能量測；電極；薄膜電極組

並列摘要

As production cost will be one of the main challenges for commercialization of fuel cells, a new approach to MEA production for PEMFC has been considered. Electrodes are produced by a new dry layer preparation method in a suction procedure and co-operated with a particle diffusion design. All structures in MEA of this process were prepared without any organic solvent; therefore the time of preparation procedures can be drastically reduced. MEA’s sandwiched structures were constituted by many materials- diffusion substrate, carbon powder, PTFE, catalyst, ion conductor, Nafion membrane. A slight difference in the quantity and character of each material will cause a apparent influence on the performance of MEAs. In gas diffusion backing layer the content of PTFE is about 40wt% and with high surface-area Ketjen Black EC600 at an optimized thickness, show better performance compared with Acetylene black and Ketjen Black EC300 carbon in backing layer. In catalyst layer preparation the suction pressure and the flow rate of nitrogen affects directly in the performance of MEA. When the pressure at 12 cm water height and the nitrogen flow rate at 4L/min show an obvious higher power density 0.21 W/cm2. The Pt loading is controlled between 0.4~0.5mg/cm2. This new dry layer preparation method with suction and powder diffusion procedure offers a simple, rapid and reliable method for MEA’s production. A faster and a low cost objective can be achieved.

並列關鍵字

MEA ； performance ； electrode

參考文獻

[1] Thomas A. Zawodzinski, John Davey, Judith Valerio, Shimshon Gottesfeld（1994）“The Water Content Dependence Of Electro-Osmotic Drag In Proton-Conducting Polymer Electrolytes”, Electrochemica Acta Vol.40 No.3 p.p 297

[2] Z.Poltarzew, P.Staiti, A. Aldercucci（1992）” Nafion Distribution in Gas Diffusion Electrodes for Solid Polymer Electrolyte Fuel Cell Applications”, Journal of the electrochemical society 139, p.p. 761

[3] P.Staiti, Z. Poltarzewski, A. Aldercucci（1994）”Solid polymer electrolyte fuel cell (SPEFC) research and development at the institute CNR-TAE of messina ”, International Journal of Hydrogen Energy 19, p.p. 523

[4] Zhigang Qi, Arthur Kaufman（2002） ” Low Pt loading high performance cathodes for PEM fuel cells”, Journal of Power Sources 113 ,p.p. 37–43

[5] Gu-Gon Park., Young-Jun Sohn, Tae-Hyun Yang,（2003）” Effect of PTFE contents in the gas diffusion mediaon the performance of PEMFC”, Journal of Power Sources

國際替代計量

質子交換膜型燃料電池薄膜電極組乾式吸附法製程之研究

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