Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, PR China.
ChemSusChem. 2013 Feb;6(2):275-82. doi: 10.1002/cssc.201200716. Epub 2013 Jan 9.
Covalently cross-linked polymer membranes were fabricated from poly(aryl sulfone benzimidazole) (SO(2)PBI) and poly(vinylbenzyl chloride) (PVBCl) as electrolytes for high-temperature proton-exchange-membrane fuel cells. The cross-linking imparted organo insolubility and chemical stability against radical attack to the otherwise flexible SO(2)PBI membranes. Steady phosphoric acid doping of the cross-linked membranes was achieved at elevated temperatures with little swelling. The acid-doped membranes exhibited increased mechanical strength compared to both pristine SO(2)PBI and poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] (mPBI). The superior characteristics of the cross-linked SO(2)PBI membranes allowed higher acid doping levels and, therefore, higher proton conductivity. Fuel-cell tests with the cross-linked membranes demonstrated a high open circuit voltage and improved power performance and durability.
交联聚合物膜由聚（芳基砜苯并咪唑）（SO(2)PBI）和聚（氯化乙烯基苯）（PVBCl）制成，用作高温质子交换膜燃料电池的电解质。交联赋予了 SO(2)PBI 膜有机不溶性和抗自由基攻击的化学稳定性，否则 SO(2)PBI 膜是柔性的。交联膜在升高的温度下实现了稳定的磷酸掺杂，几乎没有溶胀。与原始 SO(2)PBI 和聚[2,2'-(间苯二酚)-5,5'-联苯并咪唑]（mPBI）相比，掺杂酸的膜表现出更高的机械强度。交联 SO(2)PBI 膜的优越特性允许更高的酸掺杂水平，从而提高质子电导率。交联膜的燃料电池测试显示出高开路电压和改善的功率性能和耐久性。
