3D sponge-like nanoporous carbons via a facile synthesis for high-performance supercapacitors: direct carbonization of tartrate salt
3D sponge-like nanoporous carbons via a facile synthesis for high-performance supercapacitors: direct carbonization of tartrate salt
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通过轻松合成高性能超级电容器的 3D 海绵状纳米多孔碳:酒石酸盐的直接碳化
DOI:
10.1016/j.electacta.2015.04.049
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发表时间:
2015-07
影响因子:
6.6
通讯作者:
Chen Yanzheng
中科院分区:
文献类型:
--
作者:
Luo Heming;Yang Yanfei;Zhao Xia;Zhang Jianqiang;Chen Yanzheng
We report the direct synthesis of 3D sponge-like nanoporous carbons via carbonization of tartrate salt, including potassium tartrate and sodium tartrate, in inert atmosphere without any activation. The carbonization temperature is a very important parameter that ensures formation of the desired carbon structures and enhances their electrochemical performance in supercapacitors. Given that alkali metal is present in the selected carbon precursor, high-temperature activation causes reaming of carbon-K-800-1 to achieve a high specific surface area of 1018 m2g−1, thereby rendering the material suitable for use as an electrode for supercapacitors. All of the aqueous measurements were performed in a three-electrode system with 6 M KOH as the electrolyte. Carbon-K-800-1 can deliver a high specific capacitance of 296 F g−1(29.1 μF cm−2) at a constant charge–discharge current of 0.7 A g−1; this capacitance may be maintained at 213 F g−1(20.9 μF cm−2) at 20 A g−1. A long cycle stability of 95.1% capacitance retention was observed after 5000 charge–discharge cycles at a current density of 3 A g−1.
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