Ni–La composite coating obtained using deep eutectic solvent and its electrocatalytic activity
| Autor: | Grzegorz Lota, Kacper Kopczyński |
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| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Materials science Hydrogen General Chemical Engineering chemistry.chemical_element Exchange current density 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Industrial and Manufacturing Engineering 0104 chemical sciences Catalysis Deep eutectic solvent chemistry.chemical_compound chemistry Chemical engineering Materials Chemistry 0210 nano-technology Electrochemical window Eutectic system |
| Zdroj: | Chemical Papers. 74:1691-1696 |
| ISSN: | 1336-9075 2585-7290 |
| DOI: | 10.1007/s11696-019-00993-6 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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