Porous layer-stacking carbon derived from in-built template in biomass for high volumetric performance supercapacitors
Porous layer-stacking carbon derived from in-built template in biomass for high volumetric performance supercapacitors
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DOI：
10.1016/j.nanoen.2014.12.014
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发表时间：
2015-03-01
期刊：
影响因子：
17.6
通讯作者：
Fan, Zhuangjun
中科院分区：
文献类型：
--
作者：
Long, Conglai;Chen, Xu;Fan, Zhuangjun
石墨烯纳米网、活化石墨烯、弯曲石墨烯等二维多孔石墨烯材料具有高比表面积、短离子传输路径等优良的重量性能，但其体积性能较差，主要是由于电极材料的密度和孔体积较小，以及制备成本较高，限制了其进一步的应用。本文以木耳为原料，通过水热处理和炭化工艺，绿色合成了致密多孔的类石墨烯碳材料。由真菌细胞壁制备的PGC具有高的比表面积（1103 m2 g-1）、高的堆密度（约0.96 g cm-3）和多级互连的多孔骨架，可为电解质离子提供更多的存储位点和更短的传输路径，并提高电极的整体电导率。结果，PGC电极显示出360 F cm（-3）的超高体积电容和优异的循环稳定性，在10000次循环后具有99%的电容保持率。更重要的是，组装后的对称超级电容器提供了21 Wh L-1的上级体积能量密度和优异的循环稳定性（10000次循环后96%的比电容保持率）。这些令人兴奋的结果表明，高体积性能超级电容器的电极材料的低成本和环境友好的设计。(C)2014爱思唯尔有限公司版权所有。
Two-dimensional (2D) porous graphene-based materials such as graphene nanomesh, activated graphene and curved graphene, possess high gravimetric performances due to their high surface area and short ion transport path. However, their poor volumetric performances come from low density and/or high pore volume of the electrode materials, as well as their high manufacturing cost, which would limit their further applications. In this work, densely porous graphene-like carbon (PGC) materials were greenly synthesized through hydrothermal treatment of fungus (Auricularia) and subsequent carbonization process. Layer-stacking PGC derived from cell walls of fungus has high surface area (1103 m(2) g(-1)), high bulk density (about 0.96 g cm(-3)), and hierarchically interconnected porous framework, which can provide more storage sites and short transport paths for electrolyte ions, and enhance the overall conductivity of the electrode. As a result, the PGC electrode shows ultra-high volumetric capacitance of 360 F cm(-3) and excellent cycling stability with 99% capacitance retention after 10000 cycles. More importantly, the as-assembled symmetric supercapacitor delivers superior volumetric energy density of 21 Wh L-1 and excellent cycling stability (96% specific capacitance retention after 10000 cycles). These exciting results suggest a low-cost and environmentally friendly design of electrode materials for high volumetric-performance supercapacitors. (C) 2014 Elsevier Ltd. All rights reserved.