论文部分内容阅读
以浓硫酸为溶剂和磺化剂制备磺化度(DS)为65%的磺化聚醚醚酮(SPEEK),根据SPEEK和氧化石墨烯(GO)不同质量比制备一系列共混膜(S/GO).对共混膜的含水量、离子交换容量、面电阻、质子电导率、钒离子渗透率、机械强度以及耐氧化性进行研究.采用扫描电子显微镜(SEM)观察S/GO共混膜的形态;通过热重分析(TG)表征共混膜的热稳定性.结果表明随着GO引入量的增加,共混膜的含水量增加,离子交换容量(IEC)降低,质子电导率减小,钒离子渗透率减小,机械性能增强.共混膜能量效率均高于Nafion115,其中S/GO-2(GO含量2 wt%)的电池效率最佳,能量效率达到80%,相比于Nafion115提高近9%.在运行100次循环以后S/GO共混膜电池效率稳定性良好.S/GO共混膜有望在全钒液流电池中得到应用.
Sulfonated polyetheretherketone (SPEEK) with a degree of sulfonation (DS) of 65% was prepared with concentrated sulfuric acid as solvent and sulfonating agent. A series of blend membranes (S / GO) .The water content, ion exchange capacity, surface resistance, proton conductivity, vanadium ion permeability, mechanical strength and oxidation resistance of the blend membranes were investigated.Using scanning electron microscopy (SEM) The thermal stability of the blend membranes was characterized by thermogravimetric analysis (TG). The results showed that with the increase of the amount of GO, the water content of the blend membrane increased, the ion exchange capacity (IEC) decreased, and the proton conductivity decreased The energy efficiency of the blend membrane is higher than that of Nafion115, and the cell efficiency of S / GO-2 (GO content 2 wt%) is the best and the energy efficiency is up to 80% Which is nearly 9% higher than that of Nafion 115. The S / GO blend membrane has good stability and stability after 100 cycles of operation.S / GO blend membrane is expected to be used in all-vanadium flow cells.