介孔碳微球的氢醌改性及电容性能研究

doi:10.15541/jim20170134

无机材料学报 ›› 2018, Vol. 33 ›› Issue (1): 48-52.DOI: 10.15541/jim20170134 CSTR: 32189.14.10.15541/jim20170134

介孔碳微球的氢醌改性及电容性能研究

高秀丽^1,2, 王丹丹¹, 李硕¹, 邢伟¹, 阎子峰²

中国石油大学(华东) 1. 理学院;
2. 化学工程学院, 国家重质油重点实验室, 青岛 266580

收稿日期:2017-03-23 修回日期:2017-06-27 出版日期:2018-01-23 网络出版日期:2017-12-15
作者简介:高秀丽(1977-), 女, 博士研究生, 讲师. E-mail: xlgao@upc.edu.cn
基金资助:
国家自然科学基金(21476264);泰山学者青年专家计划(tsqn20161017);中央高校基础研究经费(15CX05029A)

Hydroquinone-modified Mesoporous Carbon Nanospheres with Excellent Capacitive Performance

GAO Xiu-Li^1,2, WANG Dan-Dan¹, LI Shuo¹, XING Wei¹, YAN Zi-Feng²

1. School of Science, China University of Petroleum, Qingdao 266580, China;
2. School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China

Received:2017-03-23 Revised:2017-06-27 Published:2018-01-23 Online:2017-12-15
Supported by:
National Natural Science Foundation of China (21476264);Taishan Scholar Foundation (tsqn20161017);Fundamental Research Funds for the Central Universities (15CX05029A)

摘要/Abstract

摘要：

由于纯碳材料单一的双电层储能机理, 其比电容较低, 而赝电容材料可利用法拉第反应进行能量存储, 可以获得较高的比电容。作者利用软模板法制备出具有三维有序结构的介孔碳微球, 然后采用水热法制备氢醌改性的介孔碳微球。循环伏安和恒流充放电测试表明, 氢醌改性使得介孔碳微球不仅具有双电层电容, 而且具有赝电容。负载10wt%氢醌的介孔碳微球具有最大的比电容值, 当电流密度为0.5 A/g时, 其比电容值高达285 F/g; 当电流密度增大到10 A/g时, 其比电容值仍高达212 F/g, 表现出优异的倍率特性。这主要归因于氢醌以π-π堆叠方式负载在碳质介孔表面, 不仅提供了额外的赝电容, 而且提高了碳材料在水系电解液中的倍率特性。

关键词: 介孔碳, 氢醌, 赝电容, 超级电容器

Abstract:

Pure carbon materials store energy mainly by the electric double-layer mechanism, resulting in their low specific capacitance. However, pseudocapacitive materials can store energy through faradaic reactions, leading to drastically improved specific capacitance. Herein, mesoporous carbon nanospheres with 3D ordered pore symmetry were synthesized by soft template method. Then, the hydroquinone (HQ) was used to modify mesoporous carbon nanospheres by hydrothermal method. As demonstrated by cyclic voltammetry and galvanostatic charge-discharge tests, HQ modified carbon nanospheres show both electric double layer capacitance and pseudocapacitance. Carbon nanospheres with 10wt% HQ loading possess the highest specific capacitance of 285 F/g at the current density of 0.5 A/g and 212 F/g at 10 A/g, exhibiting excellent rate performance. This should be ascribed to the HQ molecules adsorbed on carbonaceous mesopore surface by π-π interactions, which not only provide extra pseudocapacitance, but also improve the rate performance of carbons in aqueous electrolyte.

Key words: mesoporous carbon, hydroquinone, pseudocapacitance, supercapacitor

中图分类号:

TM53

高秀丽, 王丹丹, 李硕, 邢伟, 阎子峰. 介孔碳微球的氢醌改性及电容性能研究[J]. 无机材料学报, 2018, 33(1): 48-52.

GAO Xiu-Li, WANG Dan-Dan, LI Shuo, XING Wei, YAN Zi-Feng. Hydroquinone-modified Mesoporous Carbon Nanospheres with Excellent Capacitive Performance[J]. Journal of Inorganic Materials, 2018, 33(1): 48-52.

图/表 7

图1 MCNS的SEM照片

Fig. 1 SEM image of MCNS

图2 MCNS的TEM 照片

Fig. 2 TEM image of MCNS

图3 MCNS的N2吸脱附等温线和孔分布图(插图)

Fig. 3 Nitrogen sorption isotherms of MCNS and pore size distributions of MCNS (inset)

图4 扫描速率为5 mV/s时的循环伏安曲线

Fig. 4 Cyclic voltammograms of samples at a can rate of 5 mV/s

图5 电流密度为1 A/g时的计时电位

Fig. 5 Galvanostatic charge-discharge curves of samples at a current density of 1 A/g

图6 不同电流密度下样品的比电容和保持率

Fig. 6 Specific capacitances and retention ratios of samples at different current densities

图7 样品的交流阻抗谱图, 插图为高频区放大图

Fig. 7 Nyquist plots with the enlarged view of the high-frequency region in the inset for the samples

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介孔碳微球的氢醌改性及电容性能研究

Hydroquinone-modified Mesoporous Carbon Nanospheres with Excellent Capacitive Performance

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