负载植酸的金属有机框架-聚苯并咪唑复合膜在高温质子交换膜燃料电池中的性能分析  

Performance Analysis of Phytic Acid-loaded Metal Organic Framework-Polybenzimidazole Composite Membrane in High Temperature Proton Exchange Membrane Fuel Cell

作　　者：孙晗 包金小 潘高飞 SUN Han;BAO Jin-xiao;PAN Gao-fei(College of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014000,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,包头014000

出　　处：《高分子通报》2024年第7期924-933,共10页Polymer Bulletin

基　　金：国家自然科学基金(基金号51864038);内蒙古自治区高校创新科研团队项目(项目号NMGIRT2215);内蒙古自然科学基金(基金号2022JQ09,2021MS02022);内蒙古自治区高等学校科研基金(基金号NJZY23084)。

摘　　要：在聚苯并咪唑(PBI)中加入额外的质子导体是提高质子传导能力的有效策略。本文使用金属有机框架MIL-101(Cr)对植酸进行有效负载,并将其均匀分布在PBI膜中构建额外的质子传输途径。植酸在负载过程中并未破坏MIL-101(Cr)原有的晶体结构,所制备的复合膜具有比原始PBI膜更高的磷酸(PA)掺杂水平、更好的热稳定性和更强酸保留能力。此外,负载植酸的MIL-101(Cr)颗粒限制了PBI链的移动,提高了膜的力学性能,在PBI膜内构建了额外的质子传导途径和高密度氢键网路,使复合膜的电导率进一步升高,在160℃无水条件下PA掺杂的复合膜电导率最高可达到0.0744 S·cm^(-1),而PA-PBI膜仅为0.0398S·cm^(-1)。本研究还测试了在无额外加湿、无背压、160℃时的单电池性能,所制备的复合膜最大输出功率密度为178 mW·cm^(-2),比PBI膜高38 mW·cm^(-2)。Adding additional proton conductors into polybenzimidazole(PBI)is an effective strategy to improve proton conductivity.In this study,the metal-organic framework MIL-101(Cr)was used to effectively load phytic acid and evenly distribute it in the PBI membrane to construct an additional proton transport pathway.The loading process of phytic acid did not destroy the original crystal structure of MIL-101(Cr).The composite membrane prepared has a higher phosphoric acid(PA)doping level,better thermal stability and stronger acid retention ability than the original PBI membrane.In addition,the MIL-101(Cr)particles loaded with phytic acid limited the movement of the PBI chain and improved the mechanical properties of the membrane.MIL-101(Cr)loaded with phytic acid constructed additional proton conduction pathways and high-density hydrogen bond networks in the PBI membrane to further increase the conductivity of the composite membrane.The conductivity of the PA-doped composite membrane can reach 0.0744 S·cm^(-1) at 160℃under anhydrous conditions,while that of the PA-PBI membrane is only 0.0398 S·cm^(-1).In addition,the single cell performance at 160℃without additional humidification and back pressure was tested.The maximum output power density of the composite membrane is 178 mW·cm^(-2),which is 38 mW·cm^(-2) higher than that of the PBI membrane.

关 键 词：质子交换膜燃料电池 聚苯并咪唑 金属有机框架 电解质 植酸 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM911.4[电气工程—电力电子与电力传动]