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Biowaste‐Derived Hierarchical Porous Carbon Nanosheets for Ultrahigh Power Density Supercapacitors
ChemSusChem ( IF 7.5 ) Pub Date : 2018-04-20 , DOI: 10.1002/cssc.201800202
Dengfeng Yu 1 , Chong Chen 2 , Gongyuan Zhao 2 , Lei Sun 2 , Baosheng Du 1 , Hong Zhang 1 , Zhuo Li 2 , Ye Sun 1 , Flemming Besenbacher 3 , Miao Yu 2
Affiliation  

Low‐cost activated carbons with high capacitive properties remain desirable for supercapacitor applications. Herein, a three‐dimensional scaffolding framework of porous carbon nanosheets (PCNSs) has been produced from a typical biowaste, namely, ground cherry calyces, the specific composition and natural structures of which have contributed to the PCNSs having a very large specific surface area of 1612 m2 g−1, a hierarchical pore size distribution, a turbostratic carbon structure with a high degree graphitization, and about 10 % oxygen and nitrogen heteroatoms. A high specific capacitance of 350 F g−1 at 0.1 A g−1 has been achieved in a two‐electrode system with 6 m KOH; this value is among the highest specific capacitance of biomass‐derived carbon materials. More inspiringly, a high energy density of 22.8 Wh kg−1 at a power density of 198.8 W kg−1 can be obtained with 1 m aqueous solution of Li2SO4, and an ultrahigh energy density of 81.4 Wh kg−1 at a power density of 446.3 W kg−1 is realized with 1‐ethyl‐3‐methylimidazolium tetrafluoroborate electrolyte.

中文翻译:

用于超高功率密度超级电容器的生物废料分层多孔碳纳米片

具有高电容特性的低成本活性炭仍然是超级电容器应用所需要的。本文中,多孔碳纳米片(PCNSs)的三维支架是由一种典型的生物废料制成的,即地面樱桃花萼,其特定的组成和自然结构导致具有很大比表面积的PCNSs成为了现实。 1612 m 2  g -1,具有分级的孔径分布,具有高度石墨化的涡轮层状碳结构以及约10%的氧和氮杂原子。在6 m的双电极系统中,在0.1 A g -1下可获得 350 F g -1的高比电容酸值 该值是生物质衍生碳材料的最高比电容之一。更鼓舞地,22.8瓦公斤高能量密度-1在198.8千克w ^的功率密度-1可以被1得到 锂的水溶液2 SO 4,和81.4瓦公斤的超高能量密度-1以使用1-乙基-3-甲基咪唑鎓四氟硼酸盐电解质可实现446.3 W kg -1的功率密度。
更新日期:2018-04-20
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