Efficient One-Step Synthesis of Gold Nanoparticles Supported on Reduced Graphene Oxide for Methanol Oxidation Reaction Catalyst in Alkaline Electrolyte

Abstract:

This study explores the utility of reduced graphene oxide (rGO) as a support material for gold nanoparticles (AuNPs) synthesized via an economically efficient and environmentally friendly electrochemical deposition method conducted at room temperature. Employing a chronoamperometry (CA) method, we successfully synthesize AuNPs in aqueous solutions without additional stabilizing agents. We investigate the influence of substrate and electrodeposition duration on the growth of AuNPs, on indium tin oxide glass substrates and rGO, with electrodeposition durations for comparison. This research highlights the straightforward and rapid one-step synthesis of AuNPs in an aqueous medium and explores the correlation between Au particle size and electrocatalytic performance. We evaluate the electrochemical performance of rGO-supported AuNPs in the context of methanol oxidation reaction (MOR) using cyclic voltammetry in an aqueous medium with an alkaline electrolyte. Notably, AuNPs supported by rGO, featuring an average particle size of 46 nm, exhibit superior electrochemical performance compared to their counterparts with an average particle size of 165 nm when employed as catalysts for the MOR. This superior performance is characterized by a 15 mV more negative oxidation potential (54 mv compared to 39 mV) and over 2.5 times higher oxidation peak current (0.064 mA compared to 0.025 mA), underscoring their efficiency as electrocatalysts for MOR.

• Periodical: Journal of Nano Research (Volume 87)
• Pages: 49-63
• DOI: https://doi.org/10.4028/p-8ZjaKK
• Online since: March 2025
• Authors: Yahdi Bin Rus*, Haris Luthfi, Maria Ulfa
• Keywords: Catalyst, Chronoamperometry, Gold, Graphene, Methanol Oxidation, Nanoparticle

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