Electrochemical Deposition of Pd@Pd(OH)2Core-Shell Nanoparticles onto Glassy Carbon from a Deep Eutectic Solvent (Reline) and their Use as Electrocatalyst for the Methanol Oxidation Reaction

L. Juárez-Marmolejo, B. Maldonado-Teodocio, M. G. Montes De Oca-Yemha, M. Romero-Romo, M. T. Ramírez-Silva, E. M. Arce-Estrada, P. Morales-Gil, J. Mostany, M. Palomar-Pardavé

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Abstract

Pd@Pd(OH)2 core-shell nanoparticles were potentiostatically electrodeposited onto a glassy carbon electrode, GCE, from Pd(II) ions dissolved in the reline deep eutectic solvent. It is shown that the GCE/Pd@Pd(OH)2-modified electrode displays a high catalytic activity towards the methanol electrochemical oxidation reaction (MOR) in alkaline solution, revealing a mass activity of (2370 450) mA mgPd-1 at the peak potential (for CVs recorded at 0.1 V s-1), much greater than those reported to date for other nanoparticles, namely: Pd, Cu1Pd2, Pd4Ag1, PdFe, PtPdPt, Pt or Pt2Ru1, synthesized by means of technically complicated, expensive and time-consuming methods or electrodeposited from aqueous media. In particular, the steady-state current reported for PdNPs electrodeposited from aqueous media towards MOR depicted values around 3 mA mgPd-1, while those from DES (this work) reached values around 42 mA mgPd-1. Furthermore, it is shown that the Pd@Pd(OH)2 nanoparticles displayed excellent poisoning tolerances, from 2 to 8, depending on the applied potential scan rate and anodic switching potential, which remains practically constant after 200 voltammetric cycles.

Original languageEnglish
Article number112509
JournalJournal of the Electrochemical Society
Volume167
Issue number11
DOIs
StatePublished - 8 Jan 2020

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