Effect of Mg3MnNi2 on the electrochemical characteristics of Mg2Ni electrode alloy

Fu Kai Hsu, Chih Kuang Lin, Sheng Long Lee, Chun Yu Lin, Hui Yun Bor

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Mg2Ni-x mol% Mg3MnNi2 (x = 0, 15, 30, 60, 100), the novel composite alloys employed for hydrogen storage electrode, have been successfully synthesized by a method combining electric resistance melting with isothermal evaporation casting process (IECP). X-ray diffraction (XRD) analysis results show that the composite alloys are composed of Mg2Ni phases and the new Mg3MnNi2 phases. It is found on the electrochemical studies that maximum discharge capacities of the composite alloys increase with the increasing content of the Mg3MnNi2 phase. The discharge capacity of the electrode alloy is effectively improved from 17 mAh g-1 of the Mg2Ni alloy to 166 mAh g-1 of the Mg3MnNi2 alloy. Among these alloys, the Mg3MnNi2 phase possesses a positive effect on the retardation of cycling capacity degradation rate of the electrode materials. Cyclic voltammetry (CV) results confirm that the increasing content of the Mg3MnNi2 phase effectively improves the reaction activity of the electrode alloys. Surface analyses indicate that the Mg3MnNi2 phase can enhance the anti-corrosive performance of the particle surface of these composite alloys.

Original languageEnglish
Pages (from-to)374-379
Number of pages6
JournalJournal of Power Sources
Volume195
Issue number1
DOIs
StatePublished - 1 Jan 2010

Keywords

  • Composite hydrogen storage alloy
  • Electrochemical characteristics
  • Isothermal evaporation casting process

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