物理化学学报 >> 2014, Vol. 30 >> Issue (7): 1274-1280.doi: 10.3866/PKU.WHXB201405044

电化学和新能源 上一篇    下一篇

氮掺杂介孔碳的制备及其电化学超电容性能

徐玲玲, 张小华, 陈金华   

  1. 湖南大学化学化工学院, 化学生物传感与计量学国家重点实验室, 长沙 410082
  • 收稿日期:2014-03-14 修回日期:2014-05-04 发布日期:2014-06-30
  • 通讯作者: 陈金华 E-mail:chenjinhua@hnu.edu.cn
  • 基金资助:

    湖南省自然科学基金(12JJ2010),博士学科点专项科研基金(20110161110009)及长江学者和创新团队发展计划(PCSIRT,IRT1238)资助项目

Synthesis and Electrochemical Supercapacitive Properties of Nitrogen-Doped Mesoporous Carbons

XU Ling-Ling, ZHANG Xiao-Hua, CHEN Jin-Hua   

  1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
  • Received:2014-03-14 Revised:2014-05-04 Published:2014-06-30
  • Contact: CHEN Jin-Hua E-mail:chenjinhua@hnu.edu.cn
  • Supported by:

    The project was supported by the Hunan Provincial Natural Science Foundation, China (12JJ2010), Specialized Research Fund for the Doctoral Programof Higher Education, China (20110161110009), and Programfor Changjiang Scholars and Innovative Research Teamin University, China (PCSIRT, IRT1238).

摘要:

通过直接炭化沸石咪唑酯骨架结构材料(ZIF-8)纳米多面体,成功制备了氮掺杂介孔碳(NMCs). 采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、拉曼光谱、X射线光电子能谱(XPS)及比表面和孔隙度分析仪对其微观形貌和结构进行了表征,并对NMCs的电化学超电容性能进行了测试. 结果表明:NMCs具有规整的形貌、介孔纳米结构和较大比表面积(2737 m2·g-1);由于氮元素掺杂所赋予的优异的表面润湿性和赝电容性能,且介孔结构有利于电解质到达电极活性材料表面,NMCs表现出优异的电化学超电容性能,在1 A·g-1的电流密度下,1.0 mol·L-1H2SO4溶液中的比电容值为307 F·g-1,并具有良好的功率特性;此外,在10A·g-1的大电流密度下充放电循环5000次后,NMCs的比电容值保持率为96.9%.

关键词: 介孔碳, 氮掺杂, 炭化, 电容性能

Abstract:

Nitrogen-doped mesoporous carbons (NMCs) were synthesized by direct carbonization of zeolitic imidazolate framework-8 (ZIF-8) nanopolyhedrons. The surface morphology and structure were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and surface area and pore size analyzer. The electrochemical supercapacitive properties of the NMCs were also investigated. The results showed that the NMCs had a uniformmorphology, mesoporous nanostructure, and high surface area (2737m2·g-1). On the other hand, based on the excellent surface wettability, pseudocapacitive behavior and electrolyte accessibility resulted fromN-doping and the mesoporous structure, the NMCs exhibited excellent electrochemical supercapacitive properties: a high specific capacitance (307 F·g-1 in 1.0 mol·L-1 H2SO4 solution, at 1 A·g-1), good power characteristics, and satisfactory stability (the capacitance retained ratio was 96.9%after 5000 cycles even at a high current density of 10A·g-1).

Key words: Mesoporous carbon, Nitrogen doping, Carbonization, Capacitive property

MSC2000: 

  • O646