Nitrogen-doped porous carbon for supercapacitor with long-term electrochemical stability
Nitrogen-doped porous carbon for supercapacitor with long-term electrochemical stability
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DOI：
10.1016/j.jpowsour.2012.12.054
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发表时间：
2013-05-15
影响因子：
9.2
通讯作者：
Liu, Jian Wei
中科院分区：
文献类型：
--
作者：
Chen, Xiang Ying;Chen, Chong;Liu, Jian Wei
采用尿素甲醛树脂（简称脲醛树脂）混合物直接碳化法制备了氮掺杂多孔炭。UF树脂）和醋酸钙一水合物。实验结果表明，UF树脂与Ca（OAc）（2）中心点H2O的质量比和炭化温度对不同比表面积和结构的多孔炭的形成起着决定性的作用，同时也决定了炭的比表面积、孔结构和电容性能。UF-Ca-700-3：1样品表现出大得多的比电容ca.在6.0 mol L ~（-1）KOH水溶液电解液中，电流密度为0.5和1.0 A g ~（-1）时，电解质的电导率分别为334.8 F g（-1）和224.0 F g（-1）。UF-Ca-900-3：1显示出更优越的上级倍率性能，其可以具有高的比电容保持率，如ca.在20和40 A·g ~（-1）的高电流密度下，分别为67.1%和51.4%。此外，在5000次充放电循环后，容量衰减低于1%，表明其长期电化学稳定性。(C)2012爱思唯尔有限公司版权所有。
Nitrogen-doped porous carbons have been prepared by a direct carbonization of the mixture of urea formaldehyde resins (abbr. UF resins) and calcium acetate monohydrate. The experimental results reveal that the mass ratios of UF resins-to-Ca(OAc)(2)center dot H2O and carbonization temperatures can play crucial roles in the formation of porous carbon with various surface area and structure as well as determining the carbons' surface areas, pore structures and capacitive performance. The UF-Ca-700-3:1 sample exhibits much large specific capacitances ca. 334.8 F g(-1) and 224.0 F g(-1) at the current density of 0.5 and 1.0 A g(-1) in 6.0 mol L-1 aqueous KOH aqueous electrolyte, respectively. The UF-Ca-900-3:1 displays more superior rate capability, which can possess high specific capacitance retention as ca. 67.1% and 51.4% at the high current densities of 20 and 40 A g(-1), respectively. In addition, a capacity fading lower than 1% after 5000 cycles of charging and discharging is obtained, indicating its long-term electrochemical stability. (C) 2012 Elsevier B.V. All rights reserved.