Imidazolium-functionalized poly(ether ether ketone) as membrane and electrode ionomer for low-temperature alkaline membrane direct methanol fuel cell

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• 作者：Xiaoming Yan ; Shuang Gu ; Gaohong He ; Xuemei Wu ; Jay Benziger
• 关键词：Imidazolium ; Poly(ether ether ketone) ; Ionomer ; Alkaline anion exchange membrane ; Alkaline membrane direct methanol fuel cell
• 刊名：Journal of Power Sources
• 出版年：15 March, 2014
• 年：2014
• 卷：250
• 期：Complete
• 页码：90-97
• 全文大小：1495 K

文摘

A series of imidazolium-functionalized poly(ether ether ketone)s (PEEK-ImOHs) were successfully synthesized by a two-step chloromethylation-Menshutkin reaction followed by hydroxide exchange. PEEK-ImOH membranes with ion exchange capacity (IEC) ranging from 1.56 to 2.24聽mmol聽g^鈭? were prepared by solution casting. PEEK-ImOHs show selective solubility in aqueous solutions of acetone and tetrahydrofuran, but are insoluble in lower alcohols. PEEK-ImOH membranes with IEC of 2.03聽mmol聽g^鈭? have high hydroxide conductivity (52聽mS聽cm^鈭? at 20聽掳C), acceptable water swelling ratio (51% at 60聽掳C), and great tensile strength (78聽MPa), and surprising flexibility (elongation-to-break of 168%), and high thermal stability (Decomposition temperature: 193聽掳C). In addition, PEEK-ImOH membranes show low methanol permeability (1.3-6.9聽脳聽10^鈭?聽cm²聽s^鈭?). PEEK-ImOH membrane was tested in methanol/O₂ fuel cell as both the HEM and the ionomer impregnated into the catalyst layer; the open circuit voltage is 0.84聽V and the peak power density is 31聽mW聽cm^鈭?.