Surface morphology and electrochemical characterization of electrodeposited Ni–Mo nanocomposites as cathodes for hydrogen evolution

doi:10.1088/1674-1056/24/10/108202

Abstract In this work, we study the influences of current density on surface morphology and electrochemical characterization of electrodeposited Ni-Mo. The Ni-Mo composite coatings are deposited on pretreated copper substrates by electrolytic deposition. The Ni-Mo solution is taken from nickel sulfate fluid and ammonium heptamolybdate with 10 g/l. The Ni-Mo composite coatings are deposited at a temperature of 303 K with an applied current density of j_dep= 10 A/dm²-30 A/dm². We find that the corrosion resistance is improved by incorporating Mo particles into Ni matrix in 0.6-M NaCl solution. From the potentiodynamic polarization curve of electrodeposited Ni-Mo it is confirmed that the corrosion resistance decreases with increasing applied current density. The x-ray diffraction (XRD) analyses of Ni-Mo coatings indicate three phases of MoNi₄, Mo_1.24Ni_0.76, and Ni₃Mo phases crystallites of nickel and molybdenum. The scanning electronic microscopy (SEM) tests indicate that Ni-Mo coatings present cracks and pores.

Keywords: Ni-Mo electrolytic deposition corrosion resistance potentiodynamic polarization plating current density

Received: 14 February 2015
Revised: 22 May 2015
Accepted manuscript online:

PACS:	82.45.Aa	(Electrochemical synthesis)
	82.45.Bb	(Corrosion and passivation)
	82.45.Mp	(Thin layers, films, monolayers, membranes)
	82.45.Hk	(Electrolysis)

Corresponding Authors: Said Benramache
E-mail: saidbenramache07@gmail.com

Cite this article:

Elhachmi Guettaf Temam, Hachemi Ben Temam, Said Benramache Surface morphology and electrochemical characterization of electrodeposited Ni–Mo nanocomposites as cathodes for hydrogen evolution 2015 Chin. Phys. B 24 108202

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Surface morphology and electrochemical characterization of electrodeposited Ni–Mo nanocomposites as cathodes for hydrogen evolution

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