High-Performance Carbon-Nanotube-Based Supercapacitors at a Wide Temperature Range: Geometrical Effect on Diffusion of Electrolytic Ions

IF 3.9 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Yunkuo Sun, , , Baohong Ding*, , , Yonghua Jiao, , and , Wei Sun*, 
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Abstract

Supercapacitors (SCs) characterized by excellent charge and discharge rates, high power density, and stable cycling performance, exhibit crucial applications in various fields, while it faces significant performance degradation at low temperature. Herein, we systematically investigate the electrochemical performances of carbon nanotube (CNT)-based SCs over a temperature range of −18 to 60 °C and establish quantitative relationships between CNT geometry and temperature-dependent electrochemical kinetics in symmetric SCs. The results and analysis supported by electrochemical impedance spectroscopy (EIS) with Warburg diffusion analysis, Arrhenius modeling of ion diffusion kinetics, and multiterm self-discharge modeling reveal exceptional low-temperature resilience where CNT-based SCs retain >85% peak specific capacitance (75.76 F/g at 0.5 A/g) with 87% rate retention at 20 A/g (−18 °C), attributable to minimized diffusion barriers in CNTs with shorter length and wider channel that reduce Arrhenius activation energy by 33% (CNT-8-L: Q = 15.40 kJ/mol vs CNT-3-L: 23.07 kJ/mol). In addition, a symmetric CNT-based SC is successfully employed to power a digital thermometer. The self-discharge compensation effect enables optimized energy deliver of the CNT-based SC for over 40 min to the digital thermometer at −18 °C (approximately 4 times longer than at 60 °C) through suppression of current leakage as well as ion diffusion, although the specific capacitance is lower. The experimental findings and analyses contribute to the design and optimization of CNT geometries for low-temperature applications and deepen our understanding of the underlying energy storage mechanisms.

Abstract Image

宽温度范围下高性能碳纳米管超级电容器:电解离子扩散的几何效应。
超级电容器具有优良的充放电速率、高功率密度和稳定的循环性能,在各个领域都有重要的应用,但在低温下其性能会显著下降。在此,我们系统地研究了基于碳纳米管(CNT)的纳米材料在-18至60°C温度范围内的电化学性能,并在对称纳米材料中建立了碳纳米管几何形状与温度相关的电化学动力学之间的定量关系。电化学阻抗谱(EIS)、Warburg扩散分析、Arrhenius离子扩散动力学模型和多次自放电模型支持的结果和分析表明,基于碳纳米管的纳米材料具有优异的低温弹性,其峰值比电容保持在85% (0.5 A/g时为75.76 F/g),在20 A/g(-18°C)时保持率为87%。由于碳纳米管具有更短的长度和更宽的通道,使扩散屏障最小化,使Arrhenius活化能降低33% (CNT-8-L: Q = 15.40 kJ/mol vs CNT-3-L: 23.07 kJ/mol)。此外,对称的基于碳纳米管的SC被成功地用于数字温度计供电。自放电补偿效应使基于碳纳米管的SC在-18°C(大约是60°C的4倍)下向数字温度计提供超过40分钟的优化能量,通过抑制电流泄漏和离子扩散,尽管比电容较低。实验结果和分析有助于低温应用碳纳米管几何结构的设计和优化,并加深我们对潜在能量存储机制的理解。
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
Langmuir
Langmuir 化学-材料科学:综合
CiteScore
6.50
自引率
10.30%
发文量
1464
审稿时长
2.1 months
期刊介绍: Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).
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