Impedance Characterization of Hydrogen Adsorption-Absorption into an Mg2Ni Alloy Single Particle Electrode

M. Mohamedi, T. Sato, T. Itoh, M. Umeda, I. Uchida

Research output: Contribution to journalArticlepeer-review


Simple electroless solutions plating have been applied to Mg2Ni alloy: (i) Ni-plating solution using NiSO4+NaPH2O2+NaH2C 6H5O7, (ii) a reducing solution using NaPH2O2+NaH2C6H5O 7, and (iii) acid solution consisting of CuSO4+H2SO4. The electrochemical characteristics and performance of thus modified electrodes were examined using cyclic voltammetry, and electrochemical impedance spectroscopy techniques with the microelectrode technique focusing on a single particle of the alloy. The results show that all applied surface modifications have significantly improved the electrocatalytic activity of the Mg2Ni towards hydrogen absorption/adsorption processes compared to the untreated alloy. Among all the treated samples, the highest discharge capacity of 320 mAh/g, and the lowest charge-transfer resistance were obtained with Mg2Ni alloy treated by copper plating method.

Original languageEnglish
Pages (from-to)197-202
Number of pages6
JournalJournal of New Materials for Electrochemical Systems
Issue number3
Publication statusPublished - 2002 Dec 1


  • MgNi alloy
  • Rechargeable metal hydride battery
  • Single particle electrode
  • Surface modification

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrochemistry


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