ŠKANTÁROVÁ Lenka University of P.J. Safarik, Faculty of Science, Department of Physical Chemistry

Effect of Nanoparticles Size on Corrosion Behavior and Hydrogen Evolution Reaction Activity of Ni Modified Screen-Printed Carbon Electrodes

Co-authors ORIŇÁKOVÁ Renáta, ORIŇÁK Andrej, MERKOÇI Arben

The great research interest of electrochemical analyst in electromodification includes increasing the surface area, enhancing the electrode conductivity, facilitating the electron transfer and improving the analytical sensitivity and selectivity. We present the screen-printed carbon-based electrodes (SPCEs) coated with nickel nanoparticles (NiNPs) as a novel alternative to the unmodified electrodes. The electrochemical potentiostatic deposition was used as a convenient, cost-efficient and time-saving method for NiNPs-SPCEs preparation. Modified electrodes acquire very specific behavior in corrosion tests and also electrocatalytic properties to hydrogen evolution reaction (HER) even being re-useable. The morphology of NiNPs-SPCEs was characterized by scanning electron microscopy (SEM). Corrosion tests and HER measurements were performed in a highly acidic media of H2SO4 using potentiodynamic polarization methods. The electrochemical kinetic parameters such as corrosion potential and corrosion current density and also equilibrium potential values in HER were determined. Corrosion resistance was influenced by grain density boundary. Electrocatalytic characteristics of Ni nanoparticles play important role in their following sensing applications opening the way to rapid ‘in-situ’ analyses.