基于3D界面层可控构筑的高性能双极膜制备及双极燃料电池性能提升研究

降低双极膜的界面反应电阻并使其能在高电流密度下稳定工作在高性能双极膜制备和提升自增湿双极燃料电池性能研究领域至关重要。本项目采用静电纺丝技术，在双极膜的中间界面层同时共纺磺化聚醚醚酮（SPEEK）阳离子、季胺化聚苯醚（QPPO）阴离子纳米纤维来制备拥有3D界面层结构的透明纳米纤维双极膜。通过界面层中阴、阳离子纳米纤维的交叉互锁增大中间界面层的反应活性面积，并防止阴、阳离子交换膜层分离，进一步提升双极燃料电池的输出功率。主要研究3D中间界面层的可控构筑，包括界面层中的阴、阳离子纳米纤维比例，固定阳、阴离子（SO3−与N+）电荷密度及匹配，3D界面层的厚度等对3D中间界面层微观结构和纳米纤维双极膜界面反应电阻、失效行为的影响；重点研究阴、阳离子膜层厚度以及不同3D界面层结构的双极界面对双极燃料电池输出功率的影响。研究结果将为高性能双极膜的制备和双极燃料电池性能提升开拓一个新的研究视野。

It is very crucial to reduce the interfacial reaction resistance of bipolar membrane and make it steady operation under high current density in the research field of fabricating high performance bipolar membrene and enhancing performance of self-humidifying bipolar fuel cell. In this research project, the transparent nano-fiber bipolar membrane with 3D interfacial layer will be fabricated by concurrent dual-fiber electrospinning of sulfonated polyetheretherketone (SPEEK) cation nanofiber and quaternized polyphenylene oxide (QPPO) within intermediate interfacial layer of bipolar membrane. The interlocking of the anion and cation nano-fiber in the intermediate 3D interfacial layer can increase reaction activity area of the interfacial layer and prevent the delamination of anion exchange membrane layer and cation exchange membrane layer. The controllable construction of 3D interfacial layer will be investigated, including the effect of the ratio of anion to cation nano-fiber, density and matching of fixed charges（SO3−and N+）and the thickness of 3D interfacial layer on the microstructure of 3D interfacial layer, interfacial reaction resistance and failure behavior of bipolar membrane. The thickness of anion and cation exchange membrane layer, bipolar interface of different 3D interfacial layer structure on the output power of bipolar membrane fuel cell will be carefully evaluated. Research results will initiate a new research field to prepare the high performance bipolar membrane and improve the performance of bipolar fuel cell.