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Ni–La composite coating obtained using deep eutectic solvent and its electrocatalytic activity

Kacper Kopczyński and Grzegorz Lota

Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Poznan, Poland

 

E-mail: grzegorz.lota@put.poznan.pl

Received: 23 August 2019  Accepted: 9 November 2019

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.

Graphic Abstract:

Keywords: Lanthanum; Nickel; Electrodeposition; HER; Hydrogen

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-019-00993-6

 

Chemical Papers 74 (5) 1691–1696 (2020)

Tuesday, May 21, 2024

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