Poly(3,4-ethylenedioxythiphene) (PEDOT)-Modified Anodes: Reduced Methanol Crossover in Direct Methanol Fuel Cells

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• 作者：Ronald J. Stanis ; Timothy N. Lambert ; Melissa A. Yaklin
• 刊名：Energy & Fuels
• 出版年：2010
• 出版时间：May 20, 2010
• 年：2010
• 卷：24
• 期：5
• 页码：3125-3129
• 全文大小：815K
• 年卷期：v.24,no.5(May 20, 2010)
• ISSN：1520-5029

文摘

A new method to reduce methanol crossover in fuel cells is presented. This approach relies on coating an anode gas diffusion layer with poly(3,4-ethylenedioxythiophene), which is achieved by an electropolymerization method. Methanol permeability through commercially available gas diffusion layers was reduced from 4.5 × 10⁻⁵ to as low as 1.8 × 10⁻⁶ cm² s⁻¹. The use of the polymer increased the specific resistance from 0.07 to as high as 2.5 Ω cm². Fuel cell testing demonstrated a positive shift in cell voltage of about 70 mV in the low current density region of the polarization curves.