Abstract

Mixed matrix membrane revolutionized the field of electrochemistry with its multiple applications as a solid electrolyte, actuator, sensor, and storage device, because of its better processability, flexibility, and light-weight. The present study is designed to investigate the role of hybrid filler in the electrochemical properties of the mixed matrix membrane. For this purpose, aluminum and gallium hybrids with indole and its derivatives were synthesized using the post-modification method. Then, synthesized hybrids were dispersed evenly into the polysulfone matrix and developed its membrane using the immersion precipitation phase inversion method. The FTIR result of aluminum and gallium hybrids identified the absorption bands of −C=C (1485–1400 cm⁻¹), −CN (1340–1122 cm⁻¹), and –NH (1625–1535 cm⁻¹) with repeating units of Al–O (1178 cm⁻¹) and Ga-O (1132–1117 cm⁻¹). SEM images showed the spherical-shaped aluminum oxide and rod-shaped gallium oxide. XRD pattern corresponded to the cubic and trigonal crystal system of aluminum and gallium oxides. Electrochemical impedance study showed significant improvement in the electrical behavior of aluminum and gallium mixed matrix membranes where aluminum and gallium hybrids as a filler create the continuous network for the easy transportation of the charge carriers. The existence of the peaks at a similar position in both impedance and modulus formalisms suggests relaxations of the same type of charge species at the same type of electroactive region and disclose the real picture of the material.

中文翻译：

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铝和镓混合基质膜的电化学阻抗谱分析

摘要

混合基质膜具有更好的可加工性，柔韧性和轻巧性，它作为固体电解质，致动器，传感器和存储设备的多种应用彻底改变了电化学领域。本研究旨在研究混合填料在混合基质膜的电化学性质中的作用。为此，使用后修饰方法合成了具有吲哚及其衍生物的铝和镓杂化物。然后，将合成的杂种均匀地分散在聚砜基质中，并使用浸没沉淀相转化法对其膜进行显影。铝和镓杂化物的FTIR结果确定了-C = C（1485–1400 cm ^-1），-CN（1340-1122 cm ^-1）的吸收带）和–NH（1625–1535 cm ^-1）以及Al–O（1178 cm ^-1）和Ga-O（1132–1117 cm ^-1的重复单元）。SEM图像显示球形氧化铝和棒状氧化镓。XRD图谱对应于铝和镓氧化物的立方和三角晶体体系。电化学阻抗研究表明，铝和镓混合基质膜的电性能有了显着改善，其中铝和镓杂化物作为填充物可形成连续网络，从而使电荷载流子易于运输。在阻抗和模量形式上，在相似位置存在峰值表明在相同类型的电活性区域中相同类型电荷种类的弛豫，并揭示了材料的真实情况。