Título:
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Electrodeposition of sizeable and compositionally tunable rhodium-iron nanoparticles and their activity toward hydrogen evolution reaction
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Autor/a:
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Golvano Escobal, Irati; Suriñach, Santiago; Baró, M. D..; Pané i Vidal, Salvador; Sort Viñas, Jordi; Pellicer Vilà, Eva Maria
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Abstract:
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Rh-Fe nanoparticles (NPs) with variable Rh/Fe ratios have been obtained by direct current electrodeposition onto Au-metalized Si/Ti substrates from an electrolyte containing Rh(III) and Fe(III) chloride salts. NP mean diameter could be varied in the range of 20-80 nm by playing with the applied current density (-j = 0.5-2 mA cm-2) and deposition times (t = 200-3200 s). NPs were very well adhered to the substrate and became progressively enriched in Fe as the absolute value of the current density increased. X-ray photoelectron spectroscopy analyses revealed that the NPs are mostly metallic. The oxygen signal detected at surface level is relatively high but reduces down to less than 1 at% after 1 min Ar ions sputtering. The as-deposited Rh-Fe NPs are active toward hydrogen evolution reaction in alkaline medium. Different values of the onset potential for water reduction have been observed depending on the j and t values applied for NPs growth. Cycling stability tests reveal that NPs do not suffer from excessive deterioration of their electrocatalytic activity with time. |
Materia(s):
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-Nanoparticles -Electrodeposition -Hydrogen evolution reaction -Rhodium-iron |
Derechos:
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open access
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https://creativecommons.org/licenses/by-nc-nd/3.0/ |
Tipo de documento:
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Article |
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Uri:
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https://ddd.uab.cat/record/170441
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