Effect of TiO<sub>2</sub> nanoparticles on hydrogen evolution reaction activity of Ni coatings

Revanna Kullaiah; Liju Elias; Ampar Chitharanjan Hegde

doi:10.1007/s12613-018-1593-8

Volume 25 Issue 4

Apr. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(4): 472-479

Revanna Kullaiah, Liju Elias, and Ampar Chitharanjan Hegde, Effect of TiO₂ nanoparticles on hydrogen evolution reaction activity of Ni coatings, Int. J. Miner. Metall. Mater., 25(2018), No. 4, pp. 472-479. https://doi.org/10.1007/s12613-018-1593-8

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Revanna Kullaiah, Liju Elias, and Ampar Chitharanjan Hegde, Effect of TiO2 nanoparticles on hydrogen evolution reaction activity of Ni coatings, Int. J. Miner. Metall. Mater., 25(2018), No. 4, pp. 472-479. https://doi.org/10.1007/s12613-018-1593-8

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Research Article

Effect of TiO₂ nanoparticles on hydrogen evolution reaction activity of Ni coatings

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Corresponding author:
Ampar Chitharanjan Hegde E-mail: acrhegde@gmail.com
Received: 27 July 2017; Revised: 30 November 2017; Accepted: 8 December 2017

Abstract

Abstract

The electrocatalytic activity of electrodeposited Ni and Ni-TiO₂ coatings with regard to the alkaline hydrogen evolution reaction (HER) was investigated. The Ni coatings were electrodeposited from an acid chloride bath at different current densities, and their HER activities were examined in a 1.0-mol·L^-1 KOH medium. The variations in the HER activity of the Ni coatings with changes in surface morphology and composition were examined via the electrochemical dissolution and incorporation of nanoparticles. Electrochemical analysis methods were used to monitor the HER activity of the test electrodes; this activity was confirmed via the quantification of gases that evolved during the analysis. The obtained results demonstrated that the Ni-TiO₂ nanocomposite test electrode exhibited maximum activity toward the alkaline HER. The surface appearance, composition, and the phase structure of all developed coatings were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD), respectively. The improvement in the electrocatalytic activity of Ni-TiO₂ nanocomposite coating toward HER was attributed to the variation in surface morphology and increased number of active sites.
- coatings;
- electrodeposition;
- nanocomposite;
- electrocatalysis

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