Abstract
• Coatings were electrodeposited from Cr(III)-electrolytes based on a DES. • Coatings exhibited enhanced electrocatalytic activity towards hydrogen evolution. • Electrocatalytic activity is controllably changed by the addition of H 2 O to the DES. The Cr(III) plating electrolytes based on a deep eutectic solvent (DES) were used to deposit electrocatalytic coatings which exhibited increased activity in the reaction of hydrogen production in an alkaline medium. The electrolytes contained chromium(III) chloride and water additives dissolved in ethaline (a eutectic mixture of ethylene glycol and choline chloride). The electrocatalytic behaviour of coatings electrodeposited from the Cr(III)-DES-based electrolytes can be controllably affected by fine-tuning the chemical composition and surface morphology of electrodeposits via the addition of water to the DES.
Published Version
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