Abstract
The overpotential of hydrogen evolution reaction is one of the aspects which results in low efficacy of water electrolysers. There is a constant search for new ways to improve the catalytic activity, especially of nickel-based materials. Addition of lanthanum results in synergism and high activity towards the hydrogen evolution reaction. Due to the application of deep eutectic solvents which are characterized by a wide electrochemical window and good solvent properties for metal ions, it was possible to deposit the lanthanum–nickel alloy coating which was composed of around 40% of La. Hydrogen evolution reaction conducted on this layer resulted in a reduction of overpotential by 129 mV in comparison to pure Ni layer at current density of 1 mA cm−2. Other kinetic parameters, such as Tafel slope and exchange current density, were also significantly improved.
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This work was supported by the National Science Centre, Poland, Grant number 2016/23/N/ST4/02719.
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Kopczyński, K., Lota, G. Ni–La composite coating obtained using deep eutectic solvent and its electrocatalytic activity. Chem. Pap. 74, 1691–1696 (2020). https://doi.org/10.1007/s11696-019-00993-6
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DOI: https://doi.org/10.1007/s11696-019-00993-6