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Magnetic field effects on microstructural variation of electrodeposited cobalt films

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Abstract

The electrodeposition process of Co films in a sulfuric acid solution was examined in a magnetic field (0–5 T). The surface morphology of Co films electrodeposited without a magnetic field was drastically modified with the variation of hydrogen gas evolution rate. Crystalline α-Co was formed in the range of pH = 1.5–6.0, while β-Co was not observed. When the magnetic field was superimposed perpendicular to the electric field in the acidic solution (pH = 1.5), the hydrogen evolution rate was promoted by MHD convection, which enhanced the ionic mass transfer (H+ and Co2+) near the electrode surface. Moreover, crystalline β-Co was formed simultaneously with the appearance of the elongated ridge-shape precipitates under a higher magnetic field (≥3 T).

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Acknowledgments

The authors wish to thank Prof. S. Kikuchi in Shiga Prefecture University for XRD measurements and his valuable discussion and to Dr. M. Motoyama for the calculations of the surface pH values. Part of this work was performed under the financial aid given to Y. Fukunaka by the Ministry of Education, Science and Technology (Project No. 15360402), for which the authors are grateful. One of the authors, H. Matsushima, wishes to express his sincere gratitude to the Alexander von Humboldt Foundation in Germany.

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Authors and Affiliations

  1. Institute of Physical Chemistry and Electrochemistry, Dresden University of Technology, 01062, Dresden, Germany

    Hisayoshi Matsushima, Adriana Ispas, Andreas Bund & Waldfried Plieth

  2. Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan

    Yasuhiro Fukunaka

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  1. Hisayoshi Matsushima
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  2. Adriana Ispas
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  3. Andreas Bund
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  4. Waldfried Plieth
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  5. Yasuhiro Fukunaka
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Correspondence to Hisayoshi Matsushima.

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Contribution to special issue “Magnetic field effects in Electrochemistry”

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Matsushima, H., Ispas, A., Bund, A. et al. Magnetic field effects on microstructural variation of electrodeposited cobalt films. J Solid State Electrochem 11, 737–743 (2007). https://doi.org/10.1007/s10008-006-0210-3

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  • DOI: https://doi.org/10.1007/s10008-006-0210-3

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