Electrochemical Characterization of Nickel-Phosphorus Based Coatings Containing Cobalt

Publisher: Trans Tech Publications

E-ISSN: 1662-9779|2015|228|299-304

ISSN: 1012-0394

Source: Solid State Phenomena, Vol.2015, Iss.228, 2015-05, pp. : 299-7

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Abstract

The Ni-P, Ni-Co-P and Ni-P+Co coatings were obtained in galvanostatic conditions at the current density of <i>j</i><sub>dep</sub>= -200 mA cm<sup>-2</sup>. A stereoscopic microscope was used for surface morphology characterization of the coatings. The X-ray diffraction (XRD) method was used to determine phase composition of the coatings and the atomic absorption spectrometry (AAS) was applied to specify their chemical composition. The behavior of the obtained coatings was investigated in the process of hydrogen evolution reaction (HER) from 5 M KOH using steady-state polarization and electrochemical impedance spectroscopy (EIS) methods. It was found that introduction into Ni-P amorphous matrix powder of cobalt produced porous electrode materials which could be used for the HER.