In this work, solid polymer electrolytes (SPEs) were synthesized through solution casting, employing polyvinyl alcohol (PVA) as polymer hosts and sodium thiocyanate (NaSCN) for ion transport. Glycerol was incorporated to enhance ionic conduction. The conducted FTIR results establish that glycerol can dissociate more salts. The band associated with SCN anion decreased in intensity and broadened. The ionic conductivity was determined through electrochemical impedance spectroscopy (EIS). The value of ε’ is about twice that of ε’’ value, which is the subject of enormous scientific debate. The AC conductivity spectrum reveals dissimilar regions endorsed to the contributions of electrode polarization and DC conductivity. The ion fraction and its contributions were determined using transference number measurement (TNM), with ion contributions reaching 0.93. The electrolyte exhibited electrochemical stability up to 2.67 V. Charge transfer via Faradaic processes was not observed at the electrode–electrolyte interface, as indicated by CV measurements. The triangular shape of the galvanostatic charge–discharge (GCD) diagram supports capacitive behavior rather than redox reactions, with a specific capacitance of 40F/g. The regular power and energy densities of the electric double-layer capacitors (EDLCs) were estimated as 1255.2 W/kg and 5.5 Wh/kg, respectively, over 1,500 cycles.

中文翻译：

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使用 PVA 定制聚合物电解质以提高双电层电容器的性能


本工作采用固溶铸造法合成固体聚合物电解质 （SPE），采用聚乙烯醇 （PVA） 作为聚合物主体，硫氰酸钠 （NaSCN） 进行离子传输。掺入甘油以增强离子传导。进行的 FTIR 结果确定甘油可以解离更多的盐。与 SCN 阴离子相关的条带强度降低并变宽。离子电导率通过电化学阻抗谱 （EIS） 测定。ε 的值大约是 ε 值的两倍，这是巨大的科学辩论的主题。交流电导率谱显示了电极极化和直流电导率贡献的不同区域。使用转移数测量 （TNM） 测定离子分数及其贡献，离子贡献达到 0.93。电解质在高达 2.67 V 的电压下表现出电化学稳定性。正如 CV 测量所示，在电极-电解质界面上未观察到通过法拉第过程进行的电荷转移。恒电流充放电 （GCD） 图的三角形支持电容行为而不是氧化还原反应，比电容为 40F/g。在 1,500 次循环中，双电层电容器 （EDLC） 的常规功率和能量密度估计分别为 1255.2 W/kg 和 5.5 Wh/kg。