Biopolymer electrolytes (BPEs), consisting of ammonium bromide ($$\hbox {NH}_{4}\hbox {Br}$$) as the ionic provider and dextran (Leuconostoc mesenteroides) as the polymer host, are prepared by the solution cast technique. Interactions of cations from the salt have been confirmed with hydroxyl (OH) and glycosidic linkage (C–O–C) groups of dextran via Fourier transform infrared analysis. Electrolyte with 20 wt% $$\hbox {NH}_{4}\hbox {Br}$$ maximized the ionic conductivity up to ($$1.67 \pm 0.36)\times 10^{-6}$$ S $$\hbox {cm}^{-1}$$. The trend of conductivity has been verified by field emission scanning electron microscopy, where the electrolyte surface became rough as the concentration of $$\hbox {NH}_{4}\hbox {Br}$$ exceeded 20 wt%. The contribution of ions as the main charge carrier in the BPE is confirmed by transference number analysis as $$t_{\mathrm{ion}} = 0.92$$ and $$t_{\mathrm{e}} = 0.08$$. From linear sweep voltammetry, it is found that the highest conducting BPE in this work is electrochemically stable from 0 to 1.62 V. The fabricated electrochemical double-layer capacitor (EDLC) has been tested for 100 charge–discharge cycles and verified by cyclic voltammetry.

中文翻译：

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$$\hbox {NH}_{4}$$NH4Br 作为离子源对葡聚糖基生物聚合物电解质和 EDLC 应用的结构/电学性质的影响

由溴化铵 ($$\hbox {NH}_{4}\hbox {Br}$$) 作为离子提供者和葡聚糖 (Leuconostoc mesenteroides) 作为聚合物宿主组成的生物聚合物电解质 (BPE) 由溶液制备铸造技术。已经通过傅里叶变换红外分析证实了盐中阳离子与葡聚糖的羟基 (OH) 和糖苷键 (C-O-C) 基团的相互作用。含 20 wt% $$\hbox {NH}_{4}\hbox {Br}$$ 的电解质使离子电导率最大化至 ($$1.67 \pm 0.36)\times 10^{-6}$$ S $$\ hbox {cm}^{-1}$$。电导率趋势已通过场发射扫描电子显微镜验证，其中当 $$\hbox {NH}_{4}\hbox {Br}$$ 的浓度超过 20 wt% 时，电解质表面变得粗糙。离子作为 BPE 中主要电荷载体的贡献通过转移数分析证实为 $$t_{\mathrm{ion}} = 0.92$$ 和 $$t_{\mathrm{e}} = 0.08$$。从线性扫描伏安法中发现，这项工作中最高导电 BPE 在 0 到 1.62 V 范围内是电化学稳定的。制造的电化学双层电容器 (EDLC) 已经过 100 次充放电循环测试，并通过循环伏安法进行了验证。