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Synthesis of porous carbons from coal tar pitch for high-performance supercapacitors
New Carbon Materials ( IF 6.5 ) Pub Date : 2019-07-11 , DOI: 10.1016/s1872-5805(19)60006-5
Feng Wei , Han-fang Zhang , Xiao-jun He , Hao Ma , Shi-an Dong , Xiao-yu Xie

Porous carbons (PCs) for supercapacitors were synthesized by a combined Mg(OH)2 templating and in-situ KOH activation method using coal tar pitch as the carbon precursor, and were characterized by TEM, Raman spectroscopy, XPS and N2 adsorption. Their electrochemical properties were investigated by galvanostatic charge-discharge, electrochemical impedance spectroscopy and cyclic voltammetry. Results show that the specific surface area of the PCs increases with the KOH dosage and exhibits a maximum with an activation temperature at 800 °C. The optimum PC has a high surface area up to 3 145 m2 g−1 with abundant micropores, and exhibits a high specific capacitance of 272 F·g−1 at 0.05 A·g−1, a rate capability of 217 F·g−1 at 20 A·g−1 and a good cycle stability with a 96.69% capacitance retention after 10000 cycles in a 6 mol/L KOH electrolyte. This work provides a simple method for the large-scale production of PCs from pitch-based carbon sources for high-performance supercapacitors.



中文翻译:

由煤焦油沥青合成多孔碳以用于高性能超级电容器

以煤焦油沥青为碳前驱体,通过Mg(OH)2模板和原位KOH活化法相结合,合成了超级电容器用多孔碳(PCs),并通过TEM,拉曼光谱,XPS和N 2吸附进行了表征。通过恒电流充放电,电化学阻抗谱和循环伏安法研究了它们的电化学性能。结果表明,PC的比表面积随KOH剂量的增加而增加,并在800°C的活化温度下表现出最大值。最佳的PC具有高达3 145 m 2 g -1的高表面积,并具有丰富的微孔,并且在0.05 A·g -1的条件下具有272 F·g -1的高比电容。在6 mol / L KOH电解质中,在20 A·g -1下的速率能力为217 F·g -1,在10000次循环后具有良好的循环稳定性和96.69%的电容保持率。这项工作为从沥青基碳源大规模生产PC到高性能超级电容器提供了一种简单的方法。

更新日期:2019-07-11
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