Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (2): 135-140.DOI: 10.15541/jim20160276

• Orginal Article • Previous Articles     Next Articles

Preparation and Electrochemical Properties of Core-shell (Mn7C3, Ni)@C Nanoparticles

WANG Ling-Ling1, HUANG Hao1, Ramon Alberto Paredes Camacho1, WU Ai-Min1, CAO Guo-Zhong1, 2   

  1. (1. Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; 2. Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA)
  • Received:2016-04-25 Revised:2016-08-23 Published:2017-02-20 Online:2017-01-13
  • About author:WANG Ling-Ling. E-mail: Wang_LL4585@163.com
  • Supported by:
    National Natural Science Foundation of China (51171033);The Fundamental Research Funds for the Central Universities(DUT15LAB05, DUT16LAB03)

Abstract:

(Mn7C3, Ni)@C nanoparticles were synthesized for electrode material in a supercapacitor. Using DC arc-discharge method, in which the anodic target of Ni-Mn mixture was evaporated in the methane atmosphere by a tungsten cathode. The prepared nanoparticles own a well-defined core/shell structure with average diameter of 50 nm. Encapsulated inside of the carbon shell, the core of the nanoparticles is composed of Mn7C3 and Ni. Owing to its catalytic effect, Ni promotes the growth of carbon shell which has the typical double-layer capacitance. Meanwhile Mn7C3 as the product of Mn-C reaction is able to provide pseudo-capacitance. The proportion of Ni-Mn in the nanoparticles consequently affects the overall electrochemical performance of the electrodes. The specific capacitance of the electrode increases with the promotion of Mn content (485.12 F/g). The results shows that the nanoparticles with more Ni have better cycle stability (303.57 F/g) and retain 70% of the initial capacitance after 1000 cycles.

Key words: (Mn7C3, Ni)@C core-shell nanoparticles, electrode material, arc-discharge method, supercapacitor

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