Synthesis and characterization of uniform nanoparticles of γ-Mo_2N for supercapacitors  

作　　者：李学良 邢妍 汪华 王华林 王维东 陈祥迎 

机构地区：[1]School of Chemical Engineering, Hefei University of Technology [2]Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering, Hefei University of Technology

出　　处：《中国有色金属学会会刊：英文版》2009年第3期620-625,共6页Transactions of Nonferrous Metals Society of China

基　　金：Projects(08020203005, 07020203003) supported by the Annual Key Projects of Anhui Province, China

摘　　要：Uniform nanoparticles of molybdenum nitride were synthesized by temperature-programmed reaction(TPR) using MoO3 and ammonia as reactants. This material was characterized by X-ray diffractometry(XRD), transmission electron microscopy(TEM), scanning electron microcopy(SEM) and cyclic voltammetry(CV). Results show that the material consists of a pure phase of γ-Mo2N nanoparticles with average diameter of about 16 nm. The material presents a specific capacitance of 172 F/g in 1 mol/L H2SO4 electrolyte at a scan rate of 1 mV/s and the potential window is broadened to 1.1 V (-0.6 to 0.5 V). At the 6 000th cycle, the material remains 94.9% and 94.7% of the initial capacitance in 1 mol/L H2SO4 and KCl solution, respectively. A possible mechanism comprising surface control and diffusion control is proposed to explain the effect of scan rates on specific capacitance.Uniform nanoparticles of molybdenum nitride were synthesized by temperature-programmed reaction（TPR） using MoOa and ammonia as reactants. This material was characterized by X-ray diffractometry（XRD）, transmission electron microscopy（TEM）, scanning electron microcopy（SEM） and cyclic voltammetry（CV）. Results show that the material consists of a pure phase of 7-Mo2N nanoparticles with average diameter of about 16 nm. The material presents a specific capacitance of 172 F/g in 1 mol/L H2SO4 electrolyte at a scan rate of 1 mV/s and the potential window is broadened to 1.1 V （-0.6 to 0.5 V）. At the 6 000th cycle, the material remains 94.9% and 94.7% of the initial capacitance in 1 mol/L H2SO4 and KCl solution, respectively. A possible mechanism comprising surface control and diffusion control is proposed to explain the effect of scan rates on specific capacitance.

关 键 词：超级电容器 纳米粒子 Mo2N 合成 程序升温反应 透射电子显微镜 扫描电子显微镜 X射线衍射 

分 类 号：TB383.1[一般工业技术—材料科学与工程]