Biomass-derived nitrogen-doped porous carbons with tailored hierarchical porosity and high specific surface area for high energy and power density supercapacitors
Biomass-derived nitrogen-doped porous carbons with tailored hierarchical porosity and high specific surface area for high energy and power density supercapacitors
复制标题
生物质衍生的氮掺杂多孔碳，具有定制的分级孔隙率和高比表面积，适用于高能量和功率密度超级电容器
DOI：
10.1016/j.apsusc.2017.07.220
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发表时间：
2018-01-01
影响因子：
6.7
通讯作者：
Wang, Feng
中科院分区：
文献类型：
--
作者：
Sun, Junting;Niu, Jin;Wang, Feng
具有分层结构的多孔碳材料在高性能超级电容器的开发中引起了广泛的关注。在此，我们展示了一种简单有效的策略来合成具有定制多孔结构和高比表面积（SSA）的氮掺杂分层多孔碳，该策略涉及蚕茧前体的预碳化和后续碳化结合KOH活化。通过在活化过程中调整活化剂（KOH）与预炭化前驱体的质量比，以2的质量比制备的分层多孔碳（简称NHPC-2）具有较高的缺陷密度和3386 m(2) g（-1）的高SSA，以及较高的中孔和大孔体积比例（45.5%）。结果表明，基于NHPC-2电极的对称超级电容器在有机溶剂电解质中的能量密度和功率密度分别高达34.41 Wh kg（-1）和31.25 kW kg(-1)，在离子-液体电解质中的能量密度和功率密度分别达到112.1 Wh kg（-1）和23.91 kW kg（-1）。(C) 2017 Elsevier B.V.版权所有
Porous carbon materials with hierarchical structures attract intense interest for the development of high-performance supercapacitors. Herein, we demonstrate a facile and efficient strategy to synthesize nitrogen-doped hierarchically porous carbons with tailored porous structure combined with high specific surface area (SSA), which involves a pre-carbonization and a subsequent carbonization combined with KOH activation of silkworm cocoon precursors. Through adjusting the mass ratio of the activator (KOH) to pre-carbonized precursor in the activation process, the hierarchically porous carbon prepared at the mass ratio of 2 (referred to as NHPC-2) possesses a high defect density and a high SSA of 3386 m(2) g(-1) as well as the relatively high volumetric proportion of mesopores and macropores (45.5%). As a result, the energy density and power density of the symmetric supercapacitor based on NHPC-2 electrode are as high as 34.41 Wh kg(-1) and 31.25 kW kg(-1) in organic-solvent electrolyte, and are further improved to 112.1 Wh kg(-1) and 23.91 kW kg(-1) in ionic-liquid electrolyte. (C) 2017 Elsevier B.V. All rights reserved.