用于超级电容器的新型增塑甲基纤维素基固体聚合物电解质的光学、振动、电学和电化学研究

IF 2.9 Q2 ELECTROCHEMISTRY Electrochemical science advances Pub Date : 2023-07-30 DOI:10.1002/elsa.202300018
Theodore Manfo Azemtsop
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引用次数: 0

摘要

本研究以 MC(甲基纤维素)为聚合物宿主,以碘化钠(NaI)为掺杂剂,通过溶液浇铸法开发了新型增塑固体聚合物电解质(SPE)。碳酸乙酯(EC)用作增塑剂,以改善 SPE 的性能。偏光光学显微镜分析表明,由于 EC 的存在,MC-NaI-EC 薄膜的表面形态包含多孔无定形区域。傅立叶变换红外光谱证实了 MC、NaI 和 EC 之间形成的复合物。在 MC-NaI 聚合物盐基质中添加导电率增强了所制备薄膜的电化学性能。在 MC+50 wt:MC+50 重量 % NaI +10 重量 % EC。线性扫描伏安测试表明,最佳的塑化聚乙烯能承受高达 2.5 V 的电压。离子转移数分析表明,99% 的离子对总电导率有贡献。优化后的 SPE 膜和基于氧化石墨烯的电极被用于制造固态双层电容器。超级电容器电池的库仑效率为 100%,利用低频阻抗数据发现超级电容器的比电容为 18.56 F/g。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Optical, vibrational, electrical, and electrochemical studies of new plasticized methylcellulose-based solid polymer electrolytes for supercapacitor application

In this work, new plasticized solid polymer electrolytes (SPEs) are developed using MC (methylcellulose) as a polymer host, and sodium iodide (NaI) as a dopant via the solution casting method. Ethyl carbonate (EC) is used as a plasticizing agent to improve the properties of the SPEs. Polarized optical microscopy analysis reveals that the surface morphology of the MC-NaI-EC films contained porous amorphous regions owing to the presence of EC. The complex formation between MC, NaI, and EC is confirmed by Fourier-transform infrared spectra. The addition of EC in the MC-NaI polymer salt matrix enhances the electrochemical properties of the prepared films. The highest ionic conductivity of 5.06×10−3 S/cm is achieved for the composition: MC+50 wt. % NaI +10 wt. % EC. The linear sweep voltammetry test reveals that the optimal plasticized-SPE can withstand up to 2.5 V. The ionic transference number analysis reveals that 99% of ions contribute to the total conductivity. The optimized SPE film and graphene oxide-based electrodes are used to manufacture a solid-state electrical double-layer capacitor. The coulomb efficiency of the supercapacitor cell is 100%, and the specific capacitance of the supercapacitor is found to be 18.56 F/g utilizing impedance data at low frequency.

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