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Electrodeposition of Sn-Ni Alloy Coatings for Water-Splitting Application from Alkaline Medium

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Abstract

In this work, Sn-Ni alloy coatings were developed onto the surface of copper from a newly formulated electrolytic bath by a simple and cost-effective electrodeposition technique using gelatin as an additive. The electrocatalytic behavior of coatings deposited at different current densities (c.d.’s) for water-splitting applications, in terms of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), has been researched. The experimental results showed that the electrocatalytic activity of Sn-Ni coatings has a close relationship with its composition, surface morphology, and phase structure depending on the c.d. used, supported by scanning electron microscopy (SEM-EDX) and X-ray diffraction (XRD) analyses. Cyclic voltammetry and chronopotentiometry techniques have demonstrated that Sn-Ni alloy deposited at 4.0 A dm−2 (having 37.6 wt pct Ni) and 1.0 A dm−2 (having 19.6 wt pct Ni) exhibit, respectively, the highest electrocatalytic behavior for HER and OER in 1.0-M KOH solution. Sn-Ni alloy coatings were found to be stable under working conditions of electrolysis, confirmed by electrochemical corrosion tests. High electrocatalytic activity of Sn-Ni alloy coatings for both HER and OER is specific to their composition, surface morphology, and active surface area.

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Acknowledgments

The author, Sandhya Shetty, is thankful to NITK, Surathkal, India, for supporting this research in the form of an Institute Research Fellowship. Authors are thankful to the Department of Met. and Mat. Eng., NITK, Surathkal, for extending SEM and EDS facilities for analyses.

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Authors and Affiliations

  1. Electrochemistry Research Lab, Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Srinivasnagar, 575025, India

    Sandhya Shetty & A. Chitharanjan Hegde

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  1. Sandhya Shetty
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  2. A. Chitharanjan Hegde
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Correspondence to A. Chitharanjan Hegde.

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Manuscript submitted February 5, 2016.

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Shetty, S., Hegde, A.C. Electrodeposition of Sn-Ni Alloy Coatings for Water-Splitting Application from Alkaline Medium. Metall Mater Trans B 48, 632–641 (2017). https://doi.org/10.1007/s11663-016-0784-9

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