High-energy supercapacitors based on hierarchical porous carbon with an ultrahigh ion-accessible surface area in ionic liquid electrolytes
High-energy supercapacitors based on hierarchical porous carbon with an ultrahigh ion-accessible surface area in ionic liquid electrolytes
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基于分层多孔碳的高能超级电容器，在离子液体电解质中具有超高的离子可及表面积
DOI：
10.1039/c3nr00738c
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发表时间：
2013
期刊：
影响因子：
6.7
通讯作者：
Wu Dingcai
中科院分区：
文献类型：
--
作者：
Zhong Hui;Xu Fei;Li Zenghui;Fu Ruowen;Wu Dingcai
一个非常重要但真正具有挑战性的问题是如何在不牺牲功率密度的情况下大大提高超级电容器的能量密度，以接近甚至超过电池的能量密度。本文报道了一种基于聚苯乙烯衍生的多孔碳（UHSA-HPC）经KOH活化后的孔形成和增宽的新型超表面积分级多孔碳（UHSA-HPC）的制备，并强调了其在以离子液体（IL）为电解质的超级电容器中的上级储能能力。表面积超过3000 m2 g−1的UHSA-HPC显示出极高的能量密度，即，118 W h kg−1，功率密度为100 W kg−1。这归因于其独特的分层纳米网络结构，具有大量用于IL存储的小尺寸纳米孔和用于IL转移的理想介孔/大孔网络。
A very important yet really challenging issue to address is how to greatly increase the energy density of supercapacitors to approach or even exceed those of batteries without sacrificing the power density. Herein we report the fabrication of a new class of ultrahigh surface area hierarchical porous carbon (UHSA-HPC) based on the pore formation and widening of polystyrene-derived HPC by KOH activation, and highlight its superior ability for energy storage in supercapacitors with ionic liquid (IL) as electrolyte. The UHSA-HPC with a surface area of more than 3000 m2 g−1 shows an extremely high energy density, i.e., 118 W h kg−1 at a power density of 100 W kg−1. This is ascribed to its unique hierarchical nanonetwork structure with a large number of small-sized nanopores for IL storage and an ideal meso-/macroporous network for IL transfer.