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[转载]电化学交流阻抗谱研究气体扩散层压缩率对燃料电池性能的影响

已有 1397 次阅读 2011-1-30 13:58 |个人分类:燃料电池|系统分类:论文交流|文章来源:转载

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Journal of Power Sources
Article in Press, Accepted Manuscript - Note to users
doi:10.1016/j.jpowsour.2011.01.078 | How to Cite or Link Using DOI
Copyright © 2011 Published by Elsevier B.V.
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Investigation of Gas Diffusion Layers compression by Electrochemical Impedance Spectroscopy (EIS) on a running PEM-FC

Giovanni Dotellia, Corresponding Author Contact Information, E-mail The Corresponding Author, Luca Omatia, Paola Gallo Stampinoa, Paolo Grassinib and Davide Briviob

a Politecnico di Milano–Dipartimento di Chimica Materiali e Ingegneria Chimica “G. Natta”, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

b SAATI srl, via Quasimodo, 20025 Legnano, Milano, Italy

Received 31 October 2010; 
revised 8 January 2011; 
accepted 12 January 2011. 
Available online 28 January 2011.

Abstract

Two gas diffusion layers based on the same carbon cloth substrate, produced by an Italian Company (SAATI), and coated with microporous layers of different hydrophobicity, were assembled in a Polymer Electrolyte Membrane Fuel Cell and its performances assessed. For comparison the cell mounting the carbon cloth without microporous layer was also tested. The membrane electrode assembly was made of Nafion® 212 with Pt load 0.3/0.6 mg cm−2 (anode/cathode). The cell testing was run at 60 °C and 80 °C with fully humidified air (100% RH) and 80%RH hydrogen feedings. The assembly of gas diffusion layers and membrane with electrodes was compressed to 30% and 50% of its initial thickness. For each configuration polarization and power curves were recorded; in order to evaluate the role of different GDLs, AC impedance spectroscopy of the running cell was also performed.

The higher compression ratio caused the worsening of cell performances, partially mitigated when the operating temperature was raised to 80 °C. The presence of the microporous layer onto the carbon cloth resulted extremely beneficial for the operations especially at high current density; moreover, it sensibly reduces the high frequency resistance of the overall assembly.

Keywords: Gas Diffusion Layer; Micro Porous Layer; Electrochemical Impedance Spectroscopy; Compression; PEM-FC



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