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林产化学与工业 ›› 2020, Vol. 40 ›› Issue (1): 61-67.doi: 10.3969/j.issn.0253-2417.2020.01.009

• 研究报告 • 上一篇    下一篇

石墨烯改性椰壳活性炭复合材料的制备及其电化学性能研究

刘雨璇1,2,轩迪攀1,李佳佳3,李水荣1,汤海涌3,郑志锋1,*()   

  1. 1. 福建省生物质高值化技术工程研究中心; 福建省新能源产业技术开发基地; 厦门市现代农业生物质高值化技术重点实验室; 厦门大学 能源学院, 福建 厦门 361102
    2. 林业生物质资源高效利用技术国家地方联合工程研究中心; 西南地区林业生物质资源高效利用国家林业和草原局重点实验室; 云南省生物质能源国际联合研究中心 西南林业大学, 云南 昆明 650224
    3. 木林森活性炭江苏有限公司, 江苏 南京 210047
  • 收稿日期:2019-09-09 出版日期:2020-02-28 发布日期:2020-03-06
  • 通讯作者: 郑志锋 E-mail:zhifeng.zheng@xmu.edu.cn
  • 作者简介:刘雨璇(1997-),女,广东广州人,硕士生,主要从事电化学-超级电容器研究
  • 基金资助:
    国家自然科学基金资助项目(31870570);国家自然科学基金资助项目(31670599)

Preparation of Graphene Modified Coconut Shell Activated Carbon Composite and Its Electrochemical Performance

Yuxuan LIU1,2,Dipan XUAN1,Jiajia LI3,Shuirong LI1,Haiyong TANG3,Zhifeng ZHENG1,*()   

  1. 1. Fujian Provincial Engineering and Research Center of Clean and High-valued Technologies for Biomass; Fujian Provincial Industry Technologies Development Base for New Energy; Xiamen Key Laboratory for High-valued Conversion Technology of Agricultural Biomass; College of Energy, Xiamen University, Xiamen 361102, China
    2. National-local Joint Engineering Research Center for Highly-efficient Utilization Technology of Forest Biomass Resources, Key Laboratory for Highly-efficient Utilization of Forest Biomass Resources in the Southwest China, National Forestry and Grassland Administration; Yunnan Provincial International Joint Research Center for Bioenergy, Southwest Forestry University, Kunming 650224, China
    3. Jiangsu Mulinsen Activated Carbon Co., Ltd., Nanjing 210047, China
  • Received:2019-09-09 Online:2020-02-28 Published:2020-03-06
  • Contact: Zhifeng ZHENG E-mail:zhifeng.zheng@xmu.edu.cn
  • Supported by:
    国家自然科学基金资助项目(31870570);国家自然科学基金资助项目(31670599)

摘要:

以椰壳为原料,水蒸气活化法制备了椰壳活性炭(AC),并以乙醇和水作为溶剂,采用水热法将AC与石墨烯(GR)按质量比90:0、90:5、90:54、90:90和54:90复合,将制得的复合材料(GAC1~GAC5)作为电极应用于超级电容器。通过氮气吸脱附、X射线衍射(XRD)、扫描电镜(SEM)方法表征了活性炭的孔结构和表面形貌;采用循环伏安(CV)、恒电流充放电(GCD)方法分析比较不同复合比例下超级电容器电极材料的性能。实验结果表明:在炭化温度800℃,活化温度900℃及活化时间1.5 h的条件下制备的椰壳活性炭比表面积为2 482 m2/g,其孔径主要分布在2~4 nm,孔容可达1.33 cm3/g,在6 mol/L KOH电解液中比电容为85 F/g,石墨烯改性的复合材料GAC-5作为电极材料具有优异的电化学性能,在电流密度1 A/g时比电容可达186 F/g。

关键词: 活性炭, 石墨烯, 超级电容器, 比电容

Abstract:

Steam activated carbon (AC) was prepared by using coconut shell as raw material, followed by using hydrothermal method and ethanol and water as solvent to prepare capacitance super-capacitor (GAC1-GAC5) with the mass ratios of AC and graphene(GR) 90:0, 90:5, 90:54, 90:90 and 54:90. By nitrogen adsorption-desorption, XRD and SEM methods, the pore structure and surface morphology of activated carbon were characterized. Comparison of different composite capacitance ratio super-capacitor electrode material was analyzed by cyclic voltammetry(CV), galvanostatic charge-discharge(GCD) method. The experimental results showed that the specific surface area of coconut shell activated carbon was 2 482 m2/g, and its pore diameter was mainly distributed at 2-4 nm, with the pore volume as 1.33 cm3/g, specific capacitance was 85 F/g in 6 mol/L KOH electrolyte. Under the conditions of carbonization temperature of 800℃, activation temperature of 900℃ and activation time of 1.5 h, the addition of the graphite improved the composite material capacitance up to 186 F/g.

Key words: activated carbon, graphene, supercapacitor, specific capacitance

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