Synthesis of mesoporous carbons for supercapacitors from coal tar pitch by coupling microwave-assisted KOH activation with a MgO template

被引：299

作者：

He, Xiaojun ^{[1
]}

Li, Ruchun ^{[1
]}

Qiu, Jieshan ^{[2
]}

Xie, Kang ^{[1
]}

Ling, Pinghua ^{[1
]}

Yu, Moxin ^{[1
]}

Zhang, Xiaoyong ^{[1
]}

Zheng, Mingdong ^{[1
]}

机构：

[1] Anhui Univ Technol, Anhui Key Lab Coal Clean Convers & Utilizat, Sch Chem & Chem Engn, Maanshan 243002, Peoples R China

[2] Dalian Univ Technol, Liaoning Key Lab Energy Mat & Chem Engn, Sch Chem Engn, State Key Lab Fine Chem,Carbon Res Lab, Dalian 116024, Peoples R China

来源：

CARBON | 2012年 / 50卷 / 13期

基金：

美国国家科学基金会;

关键词：

DOUBLE-LAYER CAPACITORS; ELECTROCHEMICAL CAPACITORS; K2CO3; ACTIVATION; POROUS CARBONS; PORE STRUCTURE; ELECTRODE; PERFORMANCE; STORAGE;

D O I：

10.1016/j.carbon.2012.06.020

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mesoporous carbons (MCs) for supercapacitors were prepared from coal tar pitch by a microwave-assisted one-step process coupling the potassium hydroxide (KOH) activation and magnesium oxide (MgO) template. MCs were characterized by scanning electron microscope and X-ray diffraction. The results show that the specific surface area (S-BET), micropore volume and specific capacitance of MCs made by microwave heating as well as the energy density of MC capacitors pass through a maximum with increasing mass of MgO and the relative mass ratio of KOH/pitch. The S-BET of MCs varies from 1003 to 1394 m(2)/g. The S-BET and total pore volume of MC and microporous carbon made by microwave heating are bigger than that made by conventional heating. Under optimum conditions with the masses of coal tar pitch, MgO, KOH at 9 g, 12 g, 6 g, and the microwave power at 600 W, MC (MC9-12-6) made at 30 mm heating time shows a high specific capacitance of 224 F/g in 6 M KOH aqueous electrolyte after 1000 cycles. The results have shown that microwave-assisted rapid KOH activation coupled with the MgO template is an efficient one-step approach to the preparation of low cost yet high performance MCs for supercapacitors. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：4911 / 4921

页数：11

共 35 条

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