ABSTRACT

In this paper, the effect of SiO₂ nano-particles on PVA-PVP-PEG-NaI based polymer blend electrolyte (PBE) films was studied and optimized. X-ray diffraction (XRD) and attenuated total reflection (ATR)-FTIR, thermo-gravimetric analysis (TGA), and ac impedance spectroscopic techniques have been used to study the structural, thermal, and dc conductivity, respectively. XRD results reveal that the characteristic peaks of PVA-PVP-PEG-SiO₂ based nano-composite PBEs appeared at 2θ~22° with broad halo. ATR-FTIR result shows the complexation/interaction of silica nano-particles with the functional groups of PBEs. TGA analysis shows the thermal stability and decomposition temperature peak (T _{d, peak}) of the NCPBEs decrease with SiO₂ content. The prepared NCPBE film having 0.6 wt% SiO₂ shows maximum dc conductivity ~5.13x10⁻⁶ S/cm at 30°C. The ionic transference number measurement was performed by a dc polarization method, and the results reveal that the conducting species are predominately ions only. Linear sweep voltametric and cyclic voltammetric measurements have been done for electrochemical stability window study.

摘要

本文研究并优化了SiO ₂纳米粒子对PVA-PVP-PEG-NaI基聚合物共混电解质（PBE）薄膜的影响。X射线衍射（XRD）和衰减全反射（ATR）-FTIR，热重分析（TGA）和交流阻抗谱技术已分别用于研究结构，导热和直流电导率。XRD结果表明，基于PVA-PVP-PEG-SiO ₂的纳米复合PBE的特征峰出现在2θ〜22°，且具有较宽的光晕。ATR-FTIR结果显示了二氧化硅纳米粒子与PBE官能团的络合/相互作用。TGA分析表明，随着SiO _2的存在，NCPBEs的热稳定性和分解温度峰（T _d，peak）降低。内容。所制备的具有0.6wt％的SiO _2的NCPBE膜在30℃下显示出最大dc电导率〜5.13×10 ^-6 S / cm。离子转移数的测量是通过dc极化方法进行的，结果表明导电物质主要是离子。线性扫描伏安法和循环伏安法测量已经完成，用于电化学稳定性窗口研究。