Electrodeposition of sizeable and compositionally tunable rhodium-iron nanoparticles and their activity toward hydrogen evolution reaction

Irati Golvano-Escobal, Santiago Suriñach, Maria Dolors Baró, Salvador Pané, Jordi Sort, Eva Pellicer

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9 Citations (Scopus)

Abstract

© 2016 Elsevier Ltd. All rights reserved. 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.
Original languageEnglish
Pages (from-to)263-275
JournalElectrochimica Acta
Volume194
DOIs
Publication statusPublished - 10 Mar 2016

Keywords

  • electrodeposition
  • hydrogen evolution reaction
  • nanoparticles
  • rhodium-iron

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