Self-template porous carbon by direct activation of high-ash coal liquefaction residue for high-rate supercapacitor electrodes
Self-template porous carbon by direct activation of high-ash coal liquefaction residue for high-rate supercapacitor electrodes
复制标题
高灰分煤液化残渣直接活化自模板多孔碳用于高倍率超级电容器电极
DOI：
10.1002/er.6096
复制
发表时间：
2020-12-16
影响因子：
4.6
通讯作者：
Tahir, Muhammad U.
中科院分区：
文献类型：
--
作者：
Wang, Xianglong;Li, Yizhao;Tahir, Muhammad U.
随着煤化工的快速发展，高灰煤液化残渣的有效利用变得越来越重要。本文以氧化铝为原料制备自模板多孔炭。在热处理过程中，含在浆料中的灰分与氢氧化钾（KOH）反应，并形成可溶性盐。洗涤后，在灰烬的原始位置处获得微孔和介孔，而微孔被KOH从碳材料上蚀刻掉。结果，当用作超级电容器电极材料时，具有分级多孔结构的碳基底具有1787.2m2·g（-1）的最大表面积，在1A·g（-1）下达到250 F·g（-1）的强电双层电容，并且在100 A·g（-1）下保持57%的电容。优化后的多级多孔炭材料在不同充放电速率下均表现出小的等效电阻、高的电容和较强的周期可靠性。由于多孔结构、大比表面积和高电导率等优点，由高分子材料制备的高分子材料在超级电容器中具有很大的应用潜力。
Effective utilization of the wasted high-ash coal liquefaction residue (CLR) becomes increasingly important with the fast development of the coal chemical industry. Herein, a self-template porous carbon is prepared using CLR as the raw material. The ashes contained in the CLR reacted with potassium hydroxide (KOH), and soluble salts were formed during the heat treatment. After washing, micropores and mesoporous were obtained at the original positions of ashes, while micropores were etched out from the carbon material by KOH. As a result, the carbon substrate with hierarchically porous structure had a maximum surface area of 1787.2 m(2) g(-1), when used as a supercapacitor electrode material, reaching a strong electrical dual-layer capacitance of 250 F g(-1) at 1 A g(-1) and maintaining 57% capacitance at 100 A g(-1). The optimized hierarchical porous carbons (HPCs) show small equivalent resistance, high capacitance, and strong period reliability at various charging and discharging rates. HPCs derived from CLR display great potential in supercapacitors, which benefit from plentiful cavity construction, large specific surface area, and high conductivity.