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

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

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 journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	197-202
Number of pages	6
Journal	Journal of New Materials for Electrochemical Systems
Volume	5
Issue number	3
Publication status	Published - 2002 Dec 1

Keywords

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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title = "Impedance Characterization of Hydrogen Adsorption-Absorption into an Mg2Ni Alloy Single Particle Electrode",

abstract = "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.",

keywords = "MgNi alloy, Rechargeable metal hydride battery, Single particle electrode, Surface modification",

author = "M. Mohamedi and T. Sato and T. Itoh and M. Umeda and I. Uchida",

year = "2002",

month = dec,

day = "1",

language = "English",

volume = "5",

pages = "197--202",

journal = "Journal of New Materials for Electrochemical Systems",

issn = "1480-2422",

publisher = "Ecole Polytechnique de Montreal",

number = "3",

}

TY - JOUR

T1 - Impedance Characterization of Hydrogen Adsorption-Absorption into an Mg2Ni Alloy Single Particle Electrode

AU - Mohamedi, M.

AU - Sato, T.

AU - Itoh, T.

AU - Umeda, M.

AU - Uchida, I.

PY - 2002/12/1

Y1 - 2002/12/1

N2 - 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.

AB - 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.

KW - MgNi alloy

KW - Rechargeable metal hydride battery

KW - Single particle electrode

KW - Surface modification

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