Abstract
Abstract In this work the hydrogen evolution reaction (HER) onto Ni–Sn alloy coatings deposited at different current densities from the bath containing 0.1 M Sn 2+ and 0.1 M Ni 2+ ions in the pyrophosphate–glycine solution, was investigated by polarization curves and electrochemical impedance spectroscopy (EIS) measurements. Their morphology and chemical composition were investigated by scanning electron microscopy equipped with an energy-dispersive X-ray spectroscopy (SEM-EDS), while the phase composition was investigated by X-ray powder diffraction (XRPD). It was shown that their chemical composition, phase composition and morphology depend on the deposition current density. In deposited samples all detected phases, face centered cubic ( fcc ) Ni, close packed ( hcp ) hexagonal Ni 3 Sn, hexagonal Ni (1+ x ) Sn (0 x 3 Sn 4 (CoSn structure type), were of low crystallinity. The increase of the Ni–Sn alloy coatings catalytic activity for HER in 6 M KOH with increasing the deposition current density was shown to be the consequence of the change of all three parameters: chemical composition, phase composition and morphology, with the effect of morphology being the most pronounced.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
