Structural, Impedance and Electrochemical Characteristics of Electrical Double Layer Capacitor Devices Based on Chitosan: Dextran Biopolymer Blend Electrolytes
Structural, Impedance and Electrochemical Characteristics of Electrical Double Layer Capacitor Devices Based on Chitosan: Dextran Biopolymer Blend Electrolytes
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DOI：
10.3390/polym12061411
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发表时间：
2020-06-01
期刊：
影响因子：
5
通讯作者：
Kadir, Mohd F. Z.
中科院分区：
文献类型：
--
作者：
Aziz, Shujahadeen B.;Hamsan, Muhamad H.;Kadir, Mohd F. Z.
本文报道了以壳聚糖为阳离子多糖和阴离子葡聚糖(CS：葡聚糖)掺杂碘化铵(NH4I)的固体生物聚合物共混电解质膜的制备和表征，并将其用作双电层电容器(EDLC)器件的电解液和电极隔膜。用红外光谱和X射线衍射仪对薄膜的结构行为进行了研究。FTIR谱带分析表明，随着盐浓度的增加，谱带发生移位和加宽现象。X射线衍射分析表明，混合电解液样品无定形，峰被展宽。阻抗谱分析表明，在聚合物电解液中加入40wt%的NH4I盐具有较高的电导率(5.16×10~(-3)S/cm)。转移数测量证实离子(t(Ion)=0.928)是导电过程中的主要载流子。线性扫描伏安法(LSV)显示了相对较高的导电膜的耐久程度为1.8V。所制备的EDLC的电荷存储机制被解释为完全电容行为，在循环伏安图(CV)中没有出现氧化还原峰。在此基础上，计算出电容器的比电容、等效串联电阻、能量密度和功率密度四个重要参数分别为67.5F/g、160欧姆、7.59Wh/kg和520.8 W/kg。
This report presents the preparation and characterizations of solid biopolymer blend electrolyte films of chitosan as cationic polysaccharide and anionic dextran (CS: Dextran) doped with ammonium iodide (NH4I) to be utilized as electrolyte and electrode separator in electrical double-layer capacitor (EDLC) devices. FTIR and XRD techniques were used to study the structural behavior of the films. From the FTIR band analysis, shifting and broadening of the bands were observed with increasing salt concentration. The XRD analysis indicates amorphousness of the blended electrolyte samples whereby the peaks underwent broadening. The analysis of the impedance spectra emphasized that incorporation of 40 wt.% of NH4I salt into polymer electrolyte exhibited a relatively high conductivity (5.16 x 10(-3)S/cm). The transference number measurement (TNM) confirmed that ion (t(ion)= 0.928) is the main charge carriers in the conduction process. The linear sweep voltammetry (LSV) revealed the extent of durability of the relatively high conducting film which was 1.8 V. The mechanism of charge storage within the fabricated EDLC has been explained to be fully capacitive behavior with no redox peaks appearance in the cyclic voltammogram (CV). From this findings, four important parameters of the EDLC; specific capacitance, equivalent series resistance, energy density and power density were calculated as 67.5 F/g, 160 ohm, 7.59 Wh/kg and 520.8 W/kg, respectively.