A Promising Polymer Blend Electrolytes Based on Chitosan: Methyl Cellulose for EDLC Application with High Specific Capacitance and Energy Density
A Promising Polymer Blend Electrolytes Based on Chitosan: Methyl Cellulose for EDLC Application with High Specific Capacitance and Energy Density
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DOI：
10.3390/molecules24132503
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发表时间：
2019-07-01
期刊：
影响因子：
4.6
通讯作者：
Kadir, M. F. Z.
中科院分区：
文献类型：
--
作者：
Aziz, Shujahadeen B.;Hamsan, M. H.;Kadir, M. F. Z.
在目前的工作中，制备了由壳聚糖（CS）和甲基纤维素（MC）组成的有前景的质子传导固体聚合物混合电解质（SPBE），用于电化学双层电容器（EDLC）应用，具有高比电容和能量密度。与纯 CS:MC 系统相比，掺杂样品的 XRD 图谱的强度变化和宽广性质证明了电解质样品的非晶态特征。 FESEM 图像中样品的形态支持固体电解质膜的非晶态行为。阻抗和波特图结果表明体电阻随着盐浓度的增加而减小。发现最高的直流电导率为2.81 x 10(-3) S/cm。对选定的样品进行了等效电路（EEC）模型，以解释电性能的完整情况。在室温下，通过阻抗谱、循环伏安法（CV）和恒流充放电技术等电化学技术检查EDLC电池的性能。结果发现，所研究的样品作为 EDLC 应用的电解质表现出非常好的性能。发现离子是聚合物电解质中的主要电荷载体。离子转移数 (t(ion)) 为 0.84，电子转移数 (t(el)) 为 0.16。通过线性扫描伏安法（LSV）研究，发现CS:MC:NH4SCN体系在高达1.8 V的电压下电化学稳定。CV图显示没有氧化还原峰，表明活性炭电极表面出现了电荷双层。使用 CV 图和充放电分析计算所制造的 EDLC 的比电容 (C-spe)。发现其分别为 66.3 F g(-1) 和 69.9 F g(-1)（在第一个循环）。 EDLC 的等效串联电阻 (R-esr) 也已确定，范围为 50.0 至 150.0 Ω。最终，从第10次循环到第100次循环，能量密度（E-d）稳定在平均8.63 Wh kg(-1)。第一个循环获得的功率密度（P-d）为1666.6 W kg(-1)，然后在第50个循环时下降至747.0 W kg(-1)，并在EDLC完成100个循环时继续下降至555.5 W kg(-1)。
In the present work, promising proton conducting solid polymer blend electrolytes (SPBEs) composed of chitosan (CS) and methylcellulose (MC) were prepared for electrochemical double-layer capacitor (EDLC) application with a high specific capacitance and energy density. The change in intensity and the broad nature of the XRD pattern of doped samples compared to pure CS:MC system evidencedthe amorphous character of the electrolyte samples. The morphology of the samples in FESEM images supported the amorphous behavior of the solid electrolyte films. The results of impedance and Bode plotindicate that the bulk resistance decreasedwith increasing salt concentration. The highest DC conductivity was found to be 2.81 x 10(-3) S/cm. The electrical equivalent circuit (EEC) model was conducted for selected samples to explain the complete picture of the electrical properties.The performance of EDLC cells was examined at room temperature by electrochemical techniques, such as impedance spectroscopy, cyclic voltammetry (CV) and constant current charge-discharge techniques. It was found that the studied samples exhibit a very good performance as electrolyte for EDLC applications. Ions were found to be the dominant charge carriers in the polymer electrolyte. The ion transference number (t(ion)) was found to be 0.84 while 0.16 for electron transference number (t(el)). Through investigation of linear sweep voltammetry (LSV), the CS:MC:NH4SCN system was found to be electrochemically stable up to 1.8 V. The CV plot revealed no redox peak, indicating the occurrence of charge double-layer at the surface of activated carbon electrodes. Specific capacitance (C-spe) for the fabricated EDLC was calculated using CV plot and charge-discharge analyses. It was found to be 66.3 F g(-1) and 69.9 F g(-1) (at thefirst cycle), respectively. Equivalent series resistance (R-esr) of the EDLC was also identified, ranging from 50.0 to 150.0 Omega. Finally, energy density (E-d) was stabilized to anaverage of 8.63 Wh kg(-1) from the 10th cycle to the 100th cycle. The first cycle obtained power density (P-d) of 1666.6 W kg(-1) and then itdropped to 747.0 W kg(-1) at the 50th cycle and continued to drop to 555.5 W kg(-1) as the EDLC completed 100 cycles.