Cornstarch as a green binder in supercapacitors: Understanding the effect of binder on the charge storage mechanism

IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Mostafa M. Omran , Ahmed Galal , Delvin Aman
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Abstract

This study used a scalable process to fabricate activated carbon (AC) supercapacitor electrodes with cornstarch as a green binder. A vital aspect of this study was comparing its performance with synthetic binders like polyvinylidene fluoride (PVDF) and Nafion. The chemical and physical properties of the AC were characterized using Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Raman spectroscopy, and Field Emission Scanning Electron Microscopy (FE-SEM). Water contact angle measurements evaluated the hydrophilicity of AC-based electrodes with different binders. Their electrochemical characteristics were studied using open circuit potential (OCP), cyclic voltammetry (CV), galvanic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) in 1 M NaSO4 electrolyte, and the charge storage mechanism was discussed in detail. The starch binder significantly facilitated the charge storage mechanism by suppressing diffusion limitations compared to other binders. The fabricated symmetric supercapacitor device of starch-based electrodes exhibited the highest Cs of 120 F/g at a specific current of 1 A g-1 with a high energy density of 135 Wh/kg and an exact power density of 750 W/kg. The starch-based supercapacitor device exhibited a capacitance retention of 104 % and 65.5 % at specific currents of 2 A g-1 and 10 A g-1 after 10,000 cycles of charging/discharging, respectively.

玉米淀粉作为超级电容器中的绿色粘合剂:了解粘合剂对电荷存储机制的影响
这项研究采用了一种可扩展的工艺,以玉米淀粉作为绿色粘合剂来制造活性炭(AC)超级电容器电极。这项研究的一个重要方面是将其性能与聚偏二氟乙烯(PVDF)和纳菲翁等合成粘合剂进行比较。研究人员使用布鲁瑙尔-艾美特-泰勒(BET)、X 射线衍射(XRD)、傅立叶变换红外光谱(FT-IR)、拉曼光谱和场发射扫描电子显微镜(FE-SEM)对 AC 的化学和物理特性进行了表征。水接触角测量评估了含有不同粘合剂的交流电基电极的亲水性。在 1 M NaSO4 电解液中,使用开路电位 (OCP)、循环伏安 (CV)、电化学充放电 (GCD) 和电化学阻抗谱 (EIS) 研究了它们的电化学特性,并详细讨论了电荷存储机制。与其他粘合剂相比,淀粉粘合剂抑制了扩散限制,从而大大促进了电荷存储机制。所制备的淀粉基电极对称超级电容器装置在比电流为 1 A g-1 时的最高 Cs 值为 120 F/g,能量密度高达 135 Wh/kg,精确功率密度为 750 W/kg。淀粉基超级电容器装置在充电/放电 10,000 次后,在 2 A g-1 和 10 A g-1 的特定电流下,电容保持率分别为 104 % 和 65.5 %。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Carbon Trends
Carbon Trends Materials Science-Materials Science (miscellaneous)
CiteScore
4.60
自引率
0.00%
发文量
88
审稿时长
77 days
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