Template-free preparation of layer-stacked hierarchical porous carbons from coal tar pitch for high performance all-solid-state supercapacitors
Template-free preparation of layer-stacked hierarchical porous carbons from coal tar pitch for high performance all-solid-state supercapacitors
复制标题
煤焦油沥青无模板制备层状分级多孔碳用于高性能全固态超级电容器
DOI：
10.1039/c7ta02966g
复制
发表时间：
2017-08-14
影响因子：
11.9
通讯作者：
Wang, Jianlong
中科院分区：
文献类型：
--
作者：
Guan, Taotao;Li, Kaixi;Wang, Jianlong
从实际应用的角度来看，煤焦油沥青是一个合适的前体，用于制备二维分级多孔碳（HPC），由于其特定的组分组成的大量的多核芳香族建筑块。然而，基于沥青的HPC的设计和制造通常依赖于复杂的模板方法。本论文首次提出了一种简单有效的无模板自组装方法，以煤沥青为原料制备了多层多级孔活性炭。结果表明，沥青前驱体组分的均匀性、有利于交联的官能团和适宜的热处理动力学条件是控制层状堆积结构形成不可缺少的关键因素。结果表明，LHPC具有3114.2m2·g-1的超大BET比表面积，在6 M KOH溶液中，电流密度为0.5A·g-1时，比电容为356.8F·g-1。此外，使用LHPC组装了对称的全固态超级电容器，其实现了优异的灵活性和出色的循环稳定性（高达100 000次循环），以及在496 W kg（-1）的功率密度下10.25 W h kg（-1）的高能量密度。这为煤沥青可控合成活性炭开辟了一条新的途径，也有利于利用廉价的煤副产品开发炭材料的工业化。
From a practical perspective, coal tar pitch is a suitable precursor for preparing two-dimensional hierarchical porous carbons (HPCs) due to its specific components consisting of a large amount of polynuclear aromatic building blocks. However, the design and fabrication of pitch-based HPCs commonly depends on the complicated templating approaches. In this work, we first present an effective and simple self-assembly method without using templates to prepare layer-stacked hierarchical porous activated carbons (LHPCs) from coal tar pitch. It is shown that the component homogeneity of pitch precursors, the functional groups beneficial to cross-linking and the suitable heat treatment kinetic conditions are the indispensable key factors controlling the formation of layer-stacked structures. The as-obtained LHPCs have a super large BET-specific surface area of 3114.2 m(2) g(-1) and exhibit excellent electrochemical performances with a high specific capacitance of 356.8 F g(-1) at a current density of 0.5 A g(-1) in 6 M KOH. In addition, a symmetrical all-solid-state supercapacitor was assembled using LHPCs, which achieves excellent flexibility and outstanding cycling stability (up to 100 000 cycles), as well as a high energy density of 10.25 W h kg(-1) at a power density of 496 W kg(-1). This paves a new way to the controllable synthesis of activated carbons from coal tar pitch and would also be beneficial to the industrial development of carbon materials from cheap value-added by-products from coal.