Heteroatom-doped porous carbon with tunable pore structure and high specific surface area for high performance supercapacitors
Heteroatom-doped porous carbon with tunable pore structure and high specific surface area for high performance supercapacitors
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DOI：
10.1016/j.electacta.2019.05.074
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发表时间：
2019-08-10
影响因子：
6.6
通讯作者：
Habazaki, Hiroki
中科院分区：
文献类型：
--
作者：
Kim, Cheong;Zhu, Chunyu;Habazaki, Hiroki
具有高比表面积和杂原子掺杂的生物质多孔炭是制备高性能超级电容器的重要手段。在这项研究中，我们报告了一个简单而直接的策略，该策略涉及Mg/K/Mg中心点K-硝酸盐-尿素-纤维素混合物的有效和放热热解，随后的高温碳化和洗涤处理，以制备具有可调孔结构的N掺杂多孔碳。Mg/K/Mg中心点K-硝酸盐-尿素-纤维素的剧烈放热热解导致大孔的形成。随后的高温碳化和洗涤处理去除Mg、K化合物并促进大量微孔和中孔的产生。所得炭的孔径分布与前驱体中Mg中心点K比密切相关。这样，得到SSA大于2700 m（2）g（-1）的三维分级多孔碳。在双电极测量中作为超级电容器的电极的所获得的多孔碳显示出高的比电容（在6 M KOH电解质中在1 A g（-1）下为279 Fg（-1））、优异的循环稳定性（在2 Ag-1下在10，000次循环后大于89%的电容保持率）和良好的倍率性能（在甚至30 Ag-1下为235 Fg（-1））。这些结果表明，生物质纤维素衍生的杂原子掺杂分级多孔碳是一种有前途的超级电容器材料。(C)2019爱思唯尔有限公司版权所有。
Biomass-derived porous carbons with very high specific surface area (SSA) and heteroatom-doping are important for obtaining high performance supercapacitor. In this study, we report a simple and straightforward strategy, which involves the efficient and exothermic pyrolysis of Mg/K/Mg center dot K-nitrate-urea-cellulose mixture with subsequent high temperature carbonization and washing treatment, to produce N-doped porous carbon with tunable pore structure. The vigorous exothermic pyrolysis of Mg/K/Mg center dot K-nitrate-urea-cellulose induces the formation of large macropores. The subsequent high temperature carbonization and washing treatments remove Mg,K compounds and facilitate the creation of numerous micro and mesopores. The pore size distribution of the obtained carbon is quite dependent on the Mg center dot K ratio in the precursors. In this manner, the three-dimensional hierarchical porous carbon with SSA larger than 2700 m(2) g(-1) is obtained. The obtained porous carbon as the electrodes for supercapacitor in two-electrode measurement shows high specific capacitance (279 Fg(-1) at 1 A g(-1) in a 6 M KOH electrolyte), excellent cycling stability (larger than 89% capacitance retention after 10,000 cycles at 2 Ag-1) and good rate capability (235 Fg(-1) at even 30 Ag-1). These results indicate that biomass cellulose-derived heteroatom-doped hierarchical porous carbon is a promising material for supercapacitor. (C) 2019 Elsevier Ltd. All rights reserved.