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基于植酸框架构筑燃料电池用阴离子导电膜
Phytic Acid Framework-Based Alkaline Anion Exchange Membrane Construction for Fuel Cells
【摘要】 在聚乙烯醇聚合物基质中原位引入植酸、甲醇、水、九水合硝酸铬和N,N-二甲基甲酰胺的混合液(植酸与九水合硝酸铬形成具有立体结构的金属有机框架结构),以戊二醛为交联剂,将聚乙烯醇聚合物交联为网状结构,由此构筑一系列内部含有基于植酸构筑的多孔金属有机框架结构(MOF)及适合燃料电池使用的阴离子导电膜(MOF@PVA);通过调节阴离子导电膜中Cr3+的质量分数,对其结构及性能进行优化。结果表明,制得的导电膜形貌平整均一,内部含有大量可供OH-迁移和涵养水分子的孔结构;导电膜的电导率、含水率、机械性能均随着Cr3+质量分数的增加而增加。其中,当m(Cr3+)/m(导电膜)=0.012时,导电膜的电导率最高,为24.9 mS/cm;导电膜在80℃、3 mol/L NaOH溶液中浸泡168 h后,电导率仅下降8%。
【Abstract】 This paper in situ introduced a mixture of phytic acid, methanol, water, chromium nitrate nonahydrate, N, N-dimethylformamide in polyvinyl alcohol casting solution, where phytic acid and chromium nitrate nonahydrate formed a metal organic framework(MOF) with a three-dimensional structure. Glutaraldehyde was the crosslinking agent to crosslink polyvinyl alcohol into a network structure, and a series of anion exchange membranes with a porous MOF were constructed for fuel cells(MOF@PVA). During the experiment, the structure and properties of the membranes were optimized by adjusting the Cr3+content. Characterization and performance test results show that the obtained composite membranes are flat and uniform in morphology, with a large number of pore structures available for OH-migration and retention of water molecules.Additionally, membrane conductivity, water content, and mechanical properties increase with the rising Cr3+ mass fractions.When m(Cr3+)/m(conductive film) is 0.012, the conductivity is the highest, that is 24.9 mS/cm. The membrane conductivity is only reduced by 8% after being immersed in a 3 mol/L NaOH solution at 80 ℃ for 168 hours.
【Key words】 Anion exchange membrane; Conductivity; Alkaline resistance; Phytic acid; MOF;
- 【文献出处】 石油化工高等学校学报 ,Journal of Petrochemical Universities , 编辑部邮箱 ,2023年01期
- 【分类号】TB383.2;TM911.4
- 【下载频次】17