Long-Term Performance of Pt-Decorated Carbon Nanotube Cathodes in Phosphoric Acid Fuel Cells

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• 作者：Douglas R. Kauffman ; Yifan Tang ; Padmakar D. Kichambare ; John F. Jackovitz ; Alexander Star
• 刊名：Energy & Fuels
• 出版年：2010
• 出版时间：March 18, 2010
• 年：2010
• 卷：24
• 期：3
• 页码：1877-1881
• 全文大小：871K
• 年卷期：v.24,no.3(March 18, 2010)
• ISSN：1520-5029

文摘

We report the electrochemical properties and performance of Pt-decorated carbon nanotube (Pt-CNT) catalysts for long-term operation in phosphoric acid fuel cells (PAFCs). Electrochemical measurements of Pt-CNT catalysts including cyclic voltammetry, rotating ring disk electrode voltammetry, and electrochemical impedance spectroscopy were conducted to evaluate the catalyzed oxygen reduction reaction (ORR). Furthermore, we tested the long-term performance of the Pt-CNT catalysts in 2′′ × 2′′ PAFC cathodes operating at 190 °C in 85% H₃PO₄ for extended periods (up to 240 days). Lifetime studies show that electrodes containing the Pt-CNT catalysts were approximately 20 times more stable than conventional Pt-C catalyst materials, even with a substantially thinner catalyst layer. This finding of the enhanced Pt-CNT catalyst stability bodes well for possible personal electronics or automotive applications, where catalyst longevity is an essential requirement.