Pseudocapacitance and performance stability of quinone-coated carbon onions
Pseudocapacitance and performance stability of quinone-coated carbon onions
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DOI：
10.1016/j.nanoen.2013.08.003
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发表时间：
2013-09-01
期刊：
影响因子：
17.6
通讯作者：
Presser, Volker
中科院分区：
文献类型：
--
作者：
Anjos, Daniela M.;McDonough, John K.;Presser, Volker
洋葱状碳，也称为碳洋葱，是一种高导电材料，使超级电容器电极具有非常高的功率密度。然而，中等的比电容（约30 F/g）对于许多能量存储应用是不够的。在我们的研究中，我们展示了用醌装饰碳洋葱如何提供一种简便的方法，将能量密度提高到一个数量级，即从0.5 Wh/kg提高到4.5 Wh/kg，同时保持高功率密度和长寿命。我们目前的数据与三种不同的醌：1，4-萘醌，9，10-菲醌，4，5-芘二酮修饰的碳洋葱。醌修饰的碳洋葱电极进行了研究，考虑到实际的醌负载和所得的电化学性能探测在1 M的H2SO 4作为电解质，使用循环伏安法和恒电流充电/放电。对于用4，5-芘二酮改性的碳洋葱，发现最大电容264 F/g，其还显示出在1.3A/g的高电流密度下超过10，000次充电和放电循环时比电容的最小衰减，即3%。(C)2013爱思唯尔有限公司版权所有。
Onion-like carbon, also known as carbon onions, is a highly conductive material enabling supercapacitor electrodes with a very high power density. However, the moderate specific capacitance (circa 30 F/g) is insufficient for many energy storage applications. In our study, we show how decoration of carbon onions with quinones provides a facile method to increase the energy density up to one order of magnitude, namely, from 0.5 Wh/kg to 4.5 Wh/kg, while retaining a high power density and long lifetime. We present data for carbon onions modified with three different kinds of quinones: 1,4-naphthoquinone, 9,10-phenanthrenequinone, and 4,5-pyrenedione. Quinone-decorated carbon onion electrodes are investigated considering the actual quinone loading and the resulting electrochemical performance is probed in 1 M H2SO4 as the electrolyte using cyclic voltammetry and galvanostatic charge/discharge. The maximum capacitance, 264 F/g, is found for carbon onions modified with 4,5-pyrenedione, which also shows the smallest fade in specific capacitance, namely 3%, over 10,000 charge and discharge cycles at a high current density of 1.3 A/g. (C) 2013 Elsevier Ltd. All rights reserved.