Materials Science Institute, PCFM Lab and DSAPM Lab, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
Nanoscale. 2013 Jun 7;5(11):4678-82. doi: 10.1039/c3nr00738c. Epub 2013 May 1.
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 m(2) 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.
一个非常重要但极具挑战性的问题是如何在不牺牲功率密度的情况下，大幅提高超级电容器的能量密度，使其接近甚至超过电池的能量密度。在此，我们报告了一类新型超高比表面积分级多孔碳（UHSA-HPC）的制备，该材料是通过 KOH 活化使聚苯乙烯衍生的 HPC 中产生并拓宽孔而得到的，并重点介绍了其在以离子液体（IL）为电解液的超级电容器中的储能优越性。具有超过 3000 m(2) g(-1) 比表面积的 UHSA-HPC 表现出极高的能量密度，即在 100 W kg(-1) 的功率密度下达到 118 W h kg(-1)。这归因于其独特的分级纳米网络结构，具有大量用于 IL 存储的小孔和用于 IL 传递的理想中孔/大孔网络。
