H₃PO₄ imbibed polyacrylamide-graft-chitosan frameworks for high-temperature proton exchange membranes

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• 作者：Shuangshuang Yuan ; Qunwei Tang ; Benlin He ; Haiyan Chen ; Qinghua Li ; Chunqing Ma ; Suyue Jin ; Zhichao Liu
• 关键词：Proton exchange membrane ; Hydrogels ; Proton conductivity ; Fuel cells
• 刊名：Journal of Power Sources
• 出版年：1 March, 2014
• 年：2014
• 卷：249
• 期：Complete
• 页码：277-284
• 全文大小：2899 K

文摘

Proton exchange membrane (PEM), transferring protons from anode to cathode, is a key component in a PEM fuel cell. In the current work, a new class of PEMs are synthesized benefiting from the imbibition behavior of three-dimensional (3D) polyacrylamide-graft-chitosan (PAAm-graft-chitosan) frameworks to H₃PO₄ aqueous solution. Interconnected 3D framework of PAAm-graft-chitosan provides tremendous space for holding proton-conducting H₃PO₄. The highest anhydrous proton conductivity of 0.13聽S聽cm^鈭? at 165聽掳C is obtained. A fuel cell using a thick membrane as a PEM showed a peak power density of 405聽mW聽cm^鈭? with O₂ and H₂ as the oxidant and fuel, respectively. Results indicate that the interconnected 3D framework provides superhighway for proton conduction. The valued merits on anhydrous proton conductivity, huge H₃PO₄ loading, and easy synthesis promise the new membranes to be good alternatives as high-temperature PEMs.