化工进展 ›› 2018, Vol. 37 ›› Issue (06): 2340-2346.DOI: 10.16085/j.issn.1000-6613.2017-1545

• 材料科学与技术 • 上一篇    下一篇

玉米芯电容炭的制备及其电化学性能

屈笑笑1,2,3, 邢宝林1,2,3, 康伟伟4, 张传涛1,2,3, 黄光许1,2,3, 赵会会1,2,3, 田野1,2,3, 郭梦瑶1,2,3, 张传祥1,2,3   

  1. 1 河南理工大学化学化工学院, 河南 焦作 454150;
    2 煤炭安全生产河南省协同创新中心, 河南 焦作 454150;
    3 河南省煤炭绿色转化重点实验室, 河南 焦作 454150;
    4 东南大学化学化工学院, 江苏 南京 211189
  • 收稿日期:2017-07-25 修回日期:2017-09-12 出版日期:2018-06-05 发布日期:2018-06-05
  • 通讯作者: 张传祥,教授,博士生导师,从事煤基功能炭材料等方面的教学及研究工作。
  • 作者简介:屈笑笑(1992-),女,硕士研究生。E-mail:m18339169838@163.com。
  • 基金资助:
    国家自然科学基金(51404098,U1361119)、河南省国际科技合作项目(152102410047)、河南省教育厅科学技术重点研究项目(14A440014)、河南省自然科学基金(162300410115)及河南省高校科技创新团队(16IRTSTHN005)项目。

Preparation and electrochemical performance of capacitive carbon derived from corncob

QU Xiaoxiao1,2,3, XING Baolin1,2,3, KANG Weiwei4, ZHANG Chuantao1,2,3, HUANG Guangxu1,2,3, ZHAO Huihui1,2,3, TIAN Ye1,2,3, GUO Mengyao1,2,3, ZHANG Chuanxiang1,2,3   

  1. 1 College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454150, Henan, China;
    2 Coal Production Safety Collaborative Innovation Center in Henan Province, Jiaozuo 454150, Henan, China;
    3 Henan Key Laboratory of Coal Green Conversion, Jiaozuo 454150, Henan, China;
    4 Chemistry and Chemical Engineering of Southeast University, Nanjing 211189, Jiangsu, China
  • Received:2017-07-25 Revised:2017-09-12 Online:2018-06-05 Published:2018-06-05

摘要: 以玉米芯为原料,经ZnCl2一步活化法制备超级电容器用电容炭电极材料。采用低温N2吸附、扫描电镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)及X射线光电子能谱(XPS)等手段系统表征电容炭的微观结构及表面性质,并利用恒流充放电、循环伏安和漏电流等测试手段研究其在无机电解液体系(KOH)中的电化学性能。研究表明:在ZnCl2/玉米芯浸渍比为2:1、700℃的条件下活化1h可制备出比表面积为1340m2/g、总孔容为1.135cm3/g、中孔率高达97.7%的玉米芯电容炭。将其用作电极材料表现出良好的电化学特性,在50mA/g的电流密度下质量比电容为159F/g,2500mA/g电流密度下比电容仍可达137F/g,1000次循环后比电容保持率为92.5%,漏电流仅为1.9μA。结果表明:玉米芯电容炭具有良好的倍率特性和循环性能,是一种理想的电化学电容器用电极材料。

关键词: 生物质, 玉米芯, 活化, 电容炭, 电极材料, 电化学

Abstract: Capacitive carbons for electrode material of supercapacitors from corncob have been synthesized by one-step activation method. The physical properties of the prepared capacitive carbon were studied by using low temperature N2 adsorption, scanning electron microscope(SEM), X-ray diffraction(XRD), Fourier transform infrared spectrum(FTIR) and X-ray photoelectron spectroscopy (XPS). The electrochemical performances of capacitive carbon electrode materials were also investigated using galvanostatic charge/discharge, cyclic voltammetry and leakage current in 3mol/L KOH aqueous electrolyte. The results showed that the corncob capacitive carbon with a specific surface of 1340m2/g, total pore volume of 1.135cm3/g, mesoporosity up to 97.7% was obtained at ZnCl2/corncob ratio of 2, activation temperature of 700℃ and activation time of 1h. The specific capacitance reached 159F/g at a current density at 50mA/g and still remained 137F/g even at a current density of 2500mA/g. The specific capacitance could retained 92.5% after 1000 cycles and its leakage current was only 1.9μA. It showed that the corncob capacitive carbon had high-rate performance and long cycle life, and the electrode material was ideal for electrochemical capacitors.

Key words: biomass, corncob, activation, capacitive carbon, electrode material, electrochemistry

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