Abstract
Platinum electrode was coated with Sn in order to study electrochemical behavior of Sn based modified electrode in acidic electrolyte. A deep eutectic solvent consisting of ethylene glycol and choline chloride (called Ethaline) was used as deposition electrolyte by applying different voltage and time at two different temperature (room temperature and 55 °C). Tin coated platinum electrode was immersed in Na2SO4 and KOH solutions for the formation of tin oxide and tin hydroxide, respectively. Tin hydroxide and tin oxide films cycled in H2SO4 were not electroactive and these films cannot be used in acidic media for electrochemical devices. Sn electrode electrodeposited at high temperature was more than 500 times thicker than that at room temperature. Thick tin modified electrode electrodeposited in Ethaline at high temperature had the same behavior in neutral and alkaline solution as thin Sn film obtained at room temperature. Thick SnO and Sn(OH)2 films were not electroactive in acidic media the same as thin ones. Sn electrode electrodeposited from deep eutectic solvent at 55 °C and treated with acidic solution was cycled in alkaline electrolyte. Reduction of the resulted film in KOH appeared. This electrode could be used for hydrogen evolution reaction in alkaline media.
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