化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (5) : 46-50.

综述与专论

含氧纳米多孔碳球的制备及其在超级电容器中的应用

^1,2

作者信息 +

Synthesis of oxygen-doped NCSs for electrochemical supercapacitor

Fu Xingping^1,2, Jin Shaoqiang¹, Chen Peizhen^1,2, Yang Zitao¹

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文章历史 +

Received
2018-01-17
Issue Date	Revised Date
2019-06-14	2018-01-17

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摘要

开发具有规整纳米球状结构、高比表面积、高电化学活性且合成工艺简单的纳米多孔碳材料,对高储能设备至关重要。以β-环糊精为原料,采用高温水热、炭化以及氢氧化钾和碳酸钾活化制备纳米多孔碳球(NCSs),并对其进行硝酸和过硫酸铵表面氧化改性,系统研究了表面改性对多孔碳球电化学性能的影响。研究结果表明:NCSs呈规整球形结构,球直径200～300nm,比表面积为932.6m²/g,经表面氧化改性后,球形结构并无发生较大的变化,但电化学性能有明显的提升,其中NCSs经过硫酸铵(APS)氧化改性后制得的NCSs-APS,在扫描速度为5mV/s条件下,比容量为214.1F/g,相比于NCSs(比容量为140.6F/g),比容量提升了52.3%。同时NCSs-APS具有良好的循环稳定性,经3000次循环,比容量保持率为91.4%。

Abstract

Development of sample synthesis process for the fabrication of nanoporous carbon materials with well-nanospheric structure,large specific surface areas and high electrochemical performance is critical for the high electricity storage devices.Nanoporous carbon spheres(NCSs)were fabricated through a high-temperature hydrothermal carbonization,KOH/K₂CO₃ activation process and subsequent surface-modified by a wet oxidation using nitric acid and ammonium peroxodisulfate with beta-cyclodextrin raw materials.The effect of surface modification on electrochemical performance was systematically investigated.Results shown that the NCSs was regularly spherical in the shape with demeter of 200～300nm,and the specific surface was up to 932.6m²/g.After surface oxidation modification,there was no large charges in the spherical structure,but the electrochemical performance had obvious improvement.NCSs oxidized by ammonium peroxodisulfate (NCSs-APS) demonstrated excellent electrochemical performance which had gravimetric capacitance of 214.1F/g at 5mV/s and 52.3% improvement by NCSs(140.6F/g).Meanwhile NCSs-APS exhibited favorite cycle stability,which retained over 91.4% of the specific capacitance after 3000 cycles.

关键词

β-环糊精 / 纳米多孔碳球 / 湿法氧化 / 超级电容器

Key words

beta-cyclodextrin / nanoporous carbon sphere / wet oxidation / supercapacitor

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含氧纳米多孔碳球的制备及其在超级电容器中的应用[J]. 化工新型材料, 2019, 47(5): 46-50 DOI:

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