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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Synthesis and characterization of uniform nanoparticles of
γ-Mo2N for supercapacitors
LI Xue-liang(李学良)1, 2, Xing Yan(邢 妍)1, 2, Wang Hua(汪 华)1, 2,
Wang Hua-lin(王华林)1, 2, Wang Wei-dong(王维东)1, 2, Chen Xiang-ying

1. School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China;
2. Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering,
Hefei University of Technology, Hefei 230009, China

Abstract: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.

 

Key words: molybdenum nitride; cyclic voltammetry; specific capacitance; scan rate

ISSN 1672-7029
CN 43-1423/U

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