Excellent electrochemical properties and large CO2 capture of nitrogen-doped activated porous carbon synthesised from waste longan shells
Excellent electrochemical properties and large CO2 capture of nitrogen-doped activated porous carbon synthesised from waste longan shells
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DOI：
10.1016/j.electacta.2017.01.194
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发表时间：
2017-03-20
影响因子：
6.6
通讯作者：
Han, Sheng
中科院分区：
文献类型：
--
作者：
Wei, Huanming;Chen, Haijun;Han, Sheng
以废弃龙眼壳为碳源，尿素为氮源，在600 ℃ ~ 900 ℃的温度下，以KOH为活化剂，在N2气氛下活化2 h，制备了氮掺杂多孔炭。所得多孔炭具有高度发达的超微孔（约0.6 nm）、高比表面积（高达3260 m2/g）和2.3 at.%的氮含量。该多孔碳在6 M KOH中在0.5A g（-1）的电流密度下表现出优异的电化学性能（高达322 F g（-1）的高比容量和高达20.4W h kg（-1）的能量密度）和优异的循环稳定性（在5000次循环后保持几乎96.2%的比容量）。此外，多孔碳显示出5.6mmol g（-1）（在0 ℃）和4.3mmol g（-1）（在25 ℃）的高CO2吸附容量和高CO2对N-2的选择性。这些结果表明，制备的多孔碳是一种有前途的超级电容器电极材料和CO2吸收的固体吸附剂。(C)2017爱思唯尔有限公司版权所有
We present a low-cost approach for facile synthesis of nitrogen-doped porous carbons by utilising waste longan shell as carbon source and carbamide as additional nitrogen source through KOH activation at 600 degrees C-900 degrees C for 2 hours under N-2 atmosphere. The obtained porous carbons possess highly-developed ultra-micropores (approximately 0.6 nm), an ultrahigh specific surface area (up to 3260 m(2) g(-1)) and a nitrogen content of 2.3 at.%. The porous carbon exhibits excellent electrochemical properties (a high specific capacity up to 322 F g(-1) and an energy density of up to 20.4 W h kg(-1)) at a current density of 0.5 A g(-1) in 6 M KOH and an excellent cycle stability (retained almost 96.2% specific capacitance after 5000 cycles). In addition, the porous carbon shows high CO2 adsorption capacities of 5.6 mmol g(-1) (at 0 degrees C) and 4.3 mmol g(-1) (at 25 degrees C) and high CO2 selectivity against N-2. These results indicate that the fabricated porous carbon is a promising electrode material for supercapacitors and a solid adsorbent for CO2 uptake. (C) 2017 Elsevier Ltd. All rights reserved.