Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia.
Centre of Innovative Nanoscience and Nanotechnology (COINN), Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia.
Molecules. 2023 Apr 14;28(8):3461. doi: 10.3390/molecules28083461.
The increased interest in the transition from liquid to solid polymer electrolytes (SPEs) has driven enormous research in the area polymer electrolyte technology. Solid biopolymer electrolytes (SBEs) are a special class of SPEs that are obtained from natural polymers. Recently, SBEs have been generating much attention because they are simple, inexpensive, and environmentally friendly. In this work, SBEs based on glycerol-plasticized methylcellulose/pectin/potassium phosphate (MC/PC/KPO) are investigated for their potential application in an electrochemical double-layer capacitor (EDLC). The structural, electrical, thermal, dielectric, and energy moduli of the SBEs were analyzed via X-ray diffractometry (XRD), Fourier transforms infrared spectroscopy (FTIR), electrochemical impedance spectroscopy (EIS), transference number measurement (TNM), and linear sweep voltammetry (LSV). The plasticizing effect of glycerol in the MC/PC/KPO/glycerol system was confirmed by the change in the intensity of the samples' FTIR absorption bands. The broadening of the XRD peaks demonstrates that the amorphous component of SBEs increases with increasing glycerol concentration, while EIS plots demonstrate an increase in ionic conductivity with increasing plasticizer content owing to the formation of charge-transfer complexes and the expansion of amorphous domains in polymer electrolytes (PEs). The sample containing 50% glycerol has a maximal ionic conductivity of about 7.5 × 10 scm, a broad potential window of 3.99 V, and a cation transference number of 0.959 at room temperature. Using the cyclic voltammetry (CV) test, the EDLC constructed from the sample with the highest conductivity revealed a capacitive characteristic. At 5 mVs, a leaf-shaped profile with a specific capacitance of 57.14 Fg was measured based on the CV data.
对液体到固体聚合物电解质（SPE）转变的日益关注推动了聚合物电解质技术领域的大量研究。固体生物聚合物电解质（SBE）是 SPE 的一个特殊类别，它是从天然聚合物中获得的。最近，SBE 因其简单、廉价和环保而受到广泛关注。在这项工作中，研究了基于甘油增塑的甲基纤维素/果胶/磷酸钾（MC/PC/KPO）的 SBE 在电化学双层电容器（EDLC）中的潜在应用。通过 X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、电化学阻抗谱（EIS）、迁移数测量（TNM）和线性扫描伏安法（LSV）分析了 SBE 的结构、电、热、介电和能量模量。通过样品 FTIR 吸收带强度的变化证实了甘油在 MC/PC/KPO/甘油体系中的增塑作用。XRD 峰的展宽表明 SBE 的无定形成分随甘油浓度的增加而增加，而 EIS 图表明由于形成电荷转移复合物和聚合物电解质（PE）中无定形区的膨胀，随着增塑剂含量的增加，离子电导率增加。含 50%甘油的样品在室温下具有约 7.5×10-4 S cm 的最大离子电导率、3.99 V 的宽电位窗口和 0.959 的阳离子迁移数。使用循环伏安（CV）测试，从电导率最高的样品构建的 EDLC 呈现出电容特性。在 5 mVs 下，根据 CV 数据测量到具有 57.14 Fg 比电容的叶状轮廓。
