Preparation And Study Of Spiro Cations Supported Basic Polyelectrolyte Membrane

Currently,energy shortage and environmental pollution problems have driven the development and utilization of new energy.Fuel cells have made considerable research progress in the development and application of hydrogen energy due to their advantages of fast startup,low noise,and high energy conversion efficiency.Among them,the wide range of available polyelectrolyte membrane fuel cells has attracted the research of many laboratories,and the dependence of proton exchange membrane fuel cells on precious metals has led many research groups to study the lower cost anion exchange membrane fuel cells.As the core component of the anion exchange membrane fuel cell,the anion exchange membrane has become a research hotspot.The design and preparation of anion exchange membranes with high mechanical stability,high ion conductivity,and high alkali stability have become an urgent need.In recent years,there has been sufficient progress in the study of mechanical stability and ion conductivity,so alkali stability has gradually become the focus of research.In response to this demand,research groups have studied that backbone containing no heteroatoms and azaspiro cations have high alkali stability.In order to comprehensively use the alkali-stabilized backbone and cations to prepare anion exchange membranes with excellent comprehensive performance,polybiphenyl piperidine membranes grafted with spiro cations were prepared in this paper:1.Study on polybiphenyl piperidine membrane grafted with side chain spiro cation.The anion exchange membrane of this structure has excellent alkali stability and shows excellent alkali stability in the test environment of 2 M NaOH solution at 80? for up to 1400 h.Partially grafted side chain spiro cations can effectively build a micro-phase separation structure to improve the ion conductivity of the membrane.The PBP-BOP-ASU 8%membrane showes the highest ion conductivity of 117.43 mS/cm at 80?.2.Study on polybiphenyl piperidine membrane grafted with side chain cyclic trication.The higher molecular weight of the backbone further limits the water uptake and swelling ratio of the membrane and improves the dimensional stability of the membrane.The membranes grafted side chain cyclic trication show better micro-phase separation structure and higher ion conductivity,among which PBP-DMP-ASU 10%membrane shows the highest ion conductivity of 107.84 mS/cm at 80?.The membrane combining the polybiphenyl piperidine backbone and the azaspiro cation has excellent alkali stability,and the grafting of the side chain cation ensures that the membrane has a high ion conductivity.It combines the two properties of alkali stability and ion conductivity.