化工进展 ›› 2018, Vol. 37 ›› Issue (07): 2712-2719.DOI: 10.16085/j.issn.1000-6613.2017-1626

• 材料科学与技术 • 上一篇    下一篇

硫氮共掺杂石墨烯的制备及其电化学性能

李子庆1, 赫文秀1, 张永强1, 刘斌1, 蒋梦1, 刘君红2   

  1. 1 内蒙古科技大学化学与化工学院, 内蒙古 包头 014010;
    2 包头钢铁职业技术学院冶金化工系, 内蒙古 包头 014010
  • 收稿日期:2017-07-03 修回日期:2017-07-03 出版日期:2018-07-05 发布日期:2018-07-05
  • 通讯作者: 赫文秀,研究方向为能源存储转化装置电极材料。
  • 作者简介:李子庆(1992-),男,硕士研究生。
  • 基金资助:
    国家自然科学基金(21766024)、内蒙古自然科学基金(2015MS0208)、内蒙古自治区高等学校青年科技英才计划-青年科技领军人才A类项目(NJYT-14-A08)及包头市科技计划(2015C2004-1,2016-4)项目。

Preparation and electrochemical properties of sulfur-nitrogen co-doped graphene

LI Ziqing1, HE Wenxiu1, ZHANG Yongqiang1, LIU Bin1, JIANG Meng1, LIU Junhong2   

  1. 1 School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, Inner Mongolia, China;
    2 Department of Metallurgy and Chemical Engineering, Baotou Iron and Steel Vocational and Technical College, Baotou 014010, Inner Mongolia, China
  • Received:2017-07-03 Revised:2017-07-03 Online:2018-07-05 Published:2018-07-05

摘要: 采用改进的Hummers方法经冷冻干燥制备氧化石墨烯(GO),以硫脲作为还原剂和掺杂剂,按GO与硫脲的质量比为1∶10、1∶20、1∶30、1∶40的用量分别加入硫脲,采用一步水热法合成硫氮共掺杂石墨烯。通过X射线粉末衍射(XRD)、场发射扫描电子显微镜(FESEM)、拉曼光谱(Raman)、X射线光电子能谱(XPS)、氮气吸脱附分析等手段表征了样品的微观结构和形貌,通过循环伏安、电化学交流阻抗、恒流充放电技术对样品进行电化学性能测试。结果表明:当GO∶硫脲=1∶30(质量比)时,得到的硫氮共掺杂石墨烯(SNG)中硫掺杂量最高为1.86%(质量分数)、氮掺杂质量分数最高为7.73%,比表面积达175.8m2/g,且具有较窄的孔径分布,集中在3~5nm。在电流密度为1A/g时,SNG的比电容最高达197.2F/g,经过2000次充放电循环后,比电容为177.3F/g,电容保持率达90%。

关键词: 石墨烯, 水热, 制备, 显微结构, 电化学

Abstract: The modified Hummers method was used to prepare graphite oxide (GO) through freeze drying. The sulfur-nitrogen co-doped graphene samples were then synthesized by one-step hydrothermal method using thiourea as dopant and reductant, with mass ratios of GO to thiourea of 1:10, 1:20, 1:30, 1:40 respectively. The microstructure and morphology of the as-produced graphene were characterized by X-ray diffraction, field emission scanning electron microscope, Raman spectroscopy, X-ray photoelectron spectroscopy and nitrogen adsorption-desorption analysis. The electrochemical performances of the samples were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge/discharge (GCD) technology. The results showed that the sulfur-nitrogen co-doped graphene had the highest sulfur content of 1.86% and nitrogen content of 7.73%, with a specific surface area of 175.8m2/g and the pore sizes were narrowly distributed in between 3-5nm when the mass ratio of GO:thiourea is 1:30. At 1A/g current density, SNG had a specific capacitance of 197.2F/g, and only 10% were lost after 2000 charge and discharge cycles.

Key words: graphene, hydrothermal, preparation, microstructure, electrochemistry

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