Ni-MoO2 cathodes for hydrogen evolution in alkaline solutions. Effect of the conditions of their electrodeposition

Authors

  • Gvozden Tasić University of Belgrade, Vinča Institute, Department of Physical Chemistry, 11001 Belgrade, P.O. Box 522
  • Borka Jović Institute for Multidisciplinary Research University of Belgrade, 11030 Belgrade, P.O. Box 33
  • UroÅ¡ Lačnjevac Institute for Multidisciplinary Research University of Belgrade, 11030 Belgrade, P.O. Box 33
  • Nedeljko Krstajić Faculty of Technology and Metallurgy University of Belgrade, 11000 Belgrade, Karnegijeva 4
  • Vladimir Jović Institute for Multidisciplinary Research University of Belgrade, 11030 Belgrade, P.O. Box 33

DOI:

https://doi.org/10.5599/jese.2012.0027

Abstract

The electrodeposition of Ni-MoO2 composite coatings is a specific process taking place under defined hydrodynamic conditions. In this work the influence of hydrodynamics, current density, and MoO2 concentration on the electrodeposition of Ni-MoO2 coatings from a suspension of MoO2 particles in a Watt’s type bath were investigated by com­parison of their polarization characteristics for the hydrogen evolution reaction (HER) in 1 M NaOH at room temperature. It was shown that electrolyte and air flow rates influence the process of coating electrodeposition at low concentrations of MoO2. With increases in MoO2 concentration the current density became the main parameter influencing the coatings’ properties. The best coating, with the lowest over-voltage for the HER, was obtained from the suspension containing 3 g dm-3 of MoO2 particles. The over-voltage of this coat­ing was 57 mV lower for the HER at j = –0.3 A cm-2 (the current density used in industrial applications) than that for the commercial De Nora’s Ni + RuO2 electrode.

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Published

06-02-2013

How to Cite

Tasić, G., Jović, B., Lačnjevac, U., Krstajić, N., & Jović, V. (2013). Ni-MoO2 cathodes for hydrogen evolution in alkaline solutions. Effect of the conditions of their electrodeposition. Journal of Electrochemical Science and Engineering, 3(1), 29–36. https://doi.org/10.5599/jese.2012.0027

Issue

Section

Electrochemical Science