Coal-based S hybrid self-doped porous carbon for high-performance supercapacitors and potassium-ion batteries
Coal-based S hybrid self-doped porous carbon for high-performance supercapacitors and potassium-ion batteries
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用于高性能超级电容器和钾离子电池的煤基S混合自掺杂多孔碳
DOI：
10.1016/j.jpowsour.2020.228151
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发表时间：
2020
影响因子：
9.2
通讯作者：
Ting-feng Yi
中科院分区：
文献类型：
--
作者：
Sheng-xue Yan;Qing Wang;Shao-hua Luo;Ya-hui Zhang;Xin Liu;Yan-guo Liu;Zhi-yuan Wang;Ai-min Hao;Ting-feng Yi
采用煤和活化剂直接炭化的方法制备了具有高缺陷密度面积和高比表面的硫自掺杂三维分层多孔碳（S-3DHPC）杂化体，无需添加模板。合成的S-3DHPC可直接用作超级电容器和钾离子电池的电极。三维碳网的大表面积允许电解质与。电极界面，电解质离子与K þ的输运路径较短。此外，s型掺杂在层次化多孔碳中提高了电子导电性，提供了优越的电化学性能。S-3DHPC电极，431.7 F g ？在1aa的情况下？1在3 M KOH电解质显示足够的速率性能和循环稳定性。特别是组装的s - 3dhpc基柔性对称超级电容器，其能量密度高达17.8 Wh kg ？1，功率密度为652wkg ？１ ． 此外，S-3DHPC作为k离子电池的阳极具有212.9 mAh g ？50ma g ？1、具有出色的倍率能力，以及出色的循环性能。因此，S-3DHPC具有广泛的应用前景。作为高性能储能电极材料的前景。
A hybrid composed of sulfur self-doped 3D hierarchical porous carbon (S-3DHPC) with a high defect density area and a high specific surface is prepared through direct carbonization of coal and activators without any additional template. The synthesized S-3DHPC is directly used as an electrode for supercapacitors and potassium ion batteries. The large surface area of the three-dimensional carbon network allowed full contact of the electrolyte with.the electrode interface, and the transport path of the electrolyte ions and K þ is shorter. In addition, S-type doping in hierarchical porous carbon improves the electronic conductivity and provides superior electrochemical performance. The S-3DHPC electrode with 431.7 F g ?1 at 1 A g ?1 in a 3 M KOH electrolyte demonstrates an adequate rate performance and cycle stability. In particular, the assembled S-3DHPC-based flexible symmetric supercapacitor exhibits a high energy density of 17.8 Wh kg ?1 at a power density of 652 W kg ?1 . Furthermore, S-3DHPC as the anode for K-ion batteries exhibits a high reversible capacity of 212.9 mAh g ?1 at 50 mA g ?1 , an excellent rate capability, and outstanding cycling performance. Therefore, S-3DHPC has broad application.prospects as a high-performance energy storage electrode material.