基于PBI-BN的固体酸浸渍型高温膜的制备及其性能研究  

Preparation and performance investigation of solid acid impregnated high-temperature membranes with PBI-BN

作　　者：赵雨桐 宋微[1] 张军芳 邵志刚[1] ZHAO Yutong;SONG Wei;ZHANG Junfang;SHAO Zhigang(Dalian Institute of Chemical Physics,Chinese Academy of Science,Dalian Liaoning 116023,China;University of Chinese Academy of Science,Beijing 100049,China)

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《电源技术》2023年第10期1248-1253,共6页Chinese Journal of Power Sources

基　　金：国家自然基金面上项目(22179127);大连化物所创新基金(DICP I202115)。

摘　　要：为了解决高温质子交换膜燃料电池中磷酸流失问题,以磷酸五氢铯[CsH_(5)(PO4)2]代替磷酸作为质子导体,基于聚苯并咪唑(PBI)/CsH_(5)(PO_(4))_(2)复合膜的研究基础,进一步在PBI膜中添加六方氮化硼(BN),从而改善固体酸与基膜的相互作用,制备了一系列复合膜。扫描电子显微镜(SEM)和能量色散X射线谱(EDS)结果证明CsH_(5)(PO_(4))_(2)均匀分散在高温浸渍制备的复合膜的表面和内部。浸渍量测试结合X射线衍射图谱(XRD)和傅里叶变换红外光谱(FTIR)结果表明,BN掺杂量为2.5%(质量分数)的复合膜可以达到最高的固体酸浸渍率。掺杂量为10%(质量分数)时,复合膜的机械性能下降。电导率测试结果表明掺杂BN有利于提高复合膜的质子电导率,并进一步测试了PBI-CsH_(5)(PO_(4))_(2)和PBI-2.5%BN-CsH_(5)(PO_(4))_(2)复合膜组装的燃料电池性能。结果表明,在160℃下,采用PBI-2.5%BN-CsH_(5)(PO_(4))_(2)复合膜组装的燃料电池获得了更高的性能,峰值功率密度为220.618 mW/cm^(2)。这些研究表明PBI-2.5%BN-CsH_(5)(PO_(4))_(2)复合膜在高温燃料电池中具有良好的应用前景。In order to solve the issue of phosphoric acid loss in high-temperature proton exchange membrane fuel cells,a series of composite membranes were prepared by replacing phosphoric acid with CsH_(5)(PO_(4))_(2)as the proton conductor,and based on the previous research of the polybenzimidazole(PBI)/CsH_(5)(PO_(4))_(2)composite membrane,hexagonal boron nitride(BN)was added into the PBI membrane to improve the interaction between solid acid and the basement membrane.The scanning electron microscope(SEM)and energy-dispersive X-ray spectroscopy(EDS)results prove that CsH_(5)(PO_(4))_(2)uniformly disperse on the surface and inside of the composite membrane prepared by high temperature immersion.The results of the impregnation test,X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR)show that the composite membrane doped with 2.5%BN can reach the highest doping ratio of the solid acid.Moreover,the mechanical properties of the composite membrane doped with 10%BN decreased.The conductivity test shows that BN is beneficial to improve the proton conductivity of the composite membrane.The performance of fuel cells assembled with PBI-CsH_(5)(PO_(4))_(2)and PBI-2.5%BN-CsH_(5)(PO_(4))_(2)was tested.The performance of the PBI-2.5%BN-CsH_(5)(PO_(4))_(2)composite membrane fuel cells is higher with a peak power density of 220.618 mW/cm^(2) at 160℃.These results show that the PBI-2.5%BN-CsH_(5)(PO_(4))_(2)composite membrane has a promising application in high-temperature fuel cells.

关 键 词：聚苯并咪唑 氮化硼 CsH5(PO4)2 高温质子交换膜 

分 类 号：TM911.4[电气工程—电力电子与电力传动]