National Sun Yat-sen University Institutional Repository:Item 987654321/38884

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行政院國家科學委員會專題研究計畫成果報告

可攜式 DMFC 中 MEA 之電極結構與其製作研究（I）

計畫類別：個別型計畫計畫編號： NSC94-ET-7-110-002-ET 執行期間： 94 年 01 月 01 日至 94 年 12 月 31 日執行單位：國立中山大學機械與機電工程學系(所) 計畫主持人：李明三共同主持人：陳龍正報告類型：完整報告處理方式：本計畫可公開查詢

中華民國 95 年 3 月 31 日

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This is a two-year project in which the structure of the catalytic layer of the electrode used in a direct methanol fuel cell (DMFC) is the subject of the investigation. The goal is to produce a better electrode for the newly developed cylindrical portable DMFC. We have completed the work that was scheduled for the first year of this project.

Through the theoretical analysis on the electrode structure as well as the transient study on the DMFC, we have shown that the structure of the electrode is partially responsible for its poor performance. Unlike what happens inside the HFC, where both pressure and concentration gradients will generate driving forces to move the hydrogen molecules to reaction sites, while, inside the DMFC, the methanol molecules move only through diffusion, a slower mechanism, generated from the concentration gradient. Therefore, the goal is simple: shorten the distance that methanol molecules have to travel; increase the concentration gradient; and introduce other driving mechanisms into the electrode system and that leads to the development of a new structure.

The study begins with developing a dry spraying apparatus used in producing the catalytic layer. The corresponding facilities and the manufacturing processes have also been completed. Electrodes with the same catalyst loading but having different thickness were fabricated. Tests reveal that the structure, in this case the thickness change, of the catalytic layer is

closely related to its performance. For the same catalyst loading, the thinner the catalytic layer the better.

Further investigations into the design and fabrication of electrodes with catalytic layer of different structures for the DMFC will be pursued next.

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FGlA!

[1] A. Lindermeir, G. Rosenthal, U. Kunz, and U. Hoffmann, “Improvement of MEAs for Direct Methanol Fuel Cell by Tuned Layer Preparation and Coating Technology “, FUEL CELLS 2004, 4, No. 1-2, PP. 78-85.

[2] E. Gulzow, R. Reissner, S. Weisshaar, and T. Kaz, “Progress in DMFC Development Using the Dry Spraying Preparation Technique”, FUEL CELLS 2003, 3, No. 1-2, PP. 48-51.

[3] Y.H. Chu, Y.G. Shul, W.C. Choi, S.I. Woo, H.S. Han, “Evaluation of the Nafion effect on the activity of Pt-Ru electrocatalysts for the electro-oxidation of methanol”, J. of Power Sources 118 (2003), 334-341.

[4] E. Passalacqua, G. Squadrito, F. Lufrano, A. Patti, and L. Giorgi, ”Effeccts of the Diffusion Layer Characteristics on the Performance of Polymer Electrolyte Fuel Cell Electrodes”, J. of Applied Electrochemistry 31, 449-454, 2001.

[5] M. Neergat and A.K. Shula, “Effect of Diffusion-layer Morphology on the performance of solid-polymer-electrolyte direct methanol fuel cells” , J. of Power Sources 104 (2002), 289-294.

[6] K. Lasch, G. Hayn, L. Jorissen, J. Garche, and O. Besenhardt, “Mixed conducting catalyst support materials for the direct methanol fuel cell”, J. of Power Sources 105 (2002), 305-310.

[7] K.W. Park, B.K. Kwon#" J.H. Choi#" I.S. Park#" Y.M. Kim#" and Y.E. Sung# ”New RuO2

and carbon-RuO2 Composite diffusion layer for use in direct methanol fuel cells”, J. of

Power Sources 109(2002), 439-445.

[8] W. H. Lizcano-Valbuena#"V. A. Paganir#"E. R. Gonzalez# “Methanol electron-oxidation

on gas diffusion electrodes prepared with Pt-Ru/C catalysts”, Electrochimica Acta

47(2002)#"3715-3722.

[9] G. G. Park#" T. H. Yang#" Y. G. Yoon#" W. Y. Lee#" C.S. Kim#" “Pore size effect of the DMFC catalyst supported on porous materials”#"International J. of Hydrogen Energy 20 (2003)#"645-650.

[10] S.C. Thomas!X. Ren, S. Gottesfeld, P.Zelenay, ” Direct methanol fuel cell"progress in cell Performance and cathode research”, Electrochimica Acta 47(2002), 3741-3748. [11] P.V. Samant, J.B. Fernandes, ”Enhanced activity of Pt(HY) and Pt-Ru(HY) Zeolite

Catalysts for electrooxidation of methanol in fuel cells”, J. of Power Sources 125(2004), 172-177.

[12] R. O’Hayre, S. J. Lee!S. W. Cha, F.B. Prinz, “ A sharp peak in the performance of sputtered platinum fuel cells at ultra-low platinum loading”, J. of Power Sources 109(2002), 483-493.

[13] G.Y. Chen, P. Yang, ” Performance of an air-breathing direct methanol fuel cell”, J. of power Sources 123(2003), 37-42.

[14] C.Y. Chen, P. Yang, Y.S. Lee, K.F. Lin, ”Fabrication of electrocatalyst layers for direct methanol fuel cells,” J. Power Sourcesx141 (2005) 24-29

[15] Kazuyoshi Furukawa, Keiichi Okajima, Masao Sudoh, ”Structural control and impedance analysis of cathode for direct methanol fuel cell,” J. Power Sources 139 (2005) 9-14.

[16] S.Q. Song, Z.X. Liang, W.J. Zhou, G.Q. Sun, Q. Xin

,

V. Stergiopoulos, P.

Tsiakaras

,

”Direct methanol fuel cells: The effect of electrode fabrication procedure on

MEAs structural properties and cell performance,” J. of Power Sources (2005) Volume 145, Issue 2, August 18, 2005, pp. 495-501.

[17] Jing Hua Liu, Min Ku Jeon, Won Choon Choi and Seong Ihl Woo, ”Highly-optimized membrane electrode assembly for direct methanol fuel cell prepared by sedimentation method,” Journal of Power Sources, Volume 137, Issue 2, 29 October 2004, Pages 222-227.

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10

[18] Koji Makino, Kazuyoshi Furukawa, Keiichi Okajima, Masao Sudoh, ”Optimization of the sputter-deposited platinum cathode for a direct methanol fuel cell.” Electrochimica Acta 2005.

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