Electroless deposition of gold nanoparticles on a glassy carbon surface to attain methylene blue degradation via oxygen reduction reactions

Md Tarikul Islam, Md Mahmudul Hasan, Md Fazle Shabik, Fahadul Islam, Yuki Nagao, Mohammad A. Hasnat*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

A glassy carbon electrode (GCE) surface was modified with gold nanoparticles (Au NPs) via electroless deposition method. It was observed that a pristine GCE surface does not deposit Au NPs through an electroless process. However, while a GCE surface is electrochemically pretreated then sites having negative charges are generated which enables Au (III) particles to be deposited on its surface. The X-ray photoelectron spectroscopy and scanning electron microscopy were used to characterize the electrode surface. It was found that Au NPs are deposited on the GCE surface (Au-GCE) having flower like shapes. The resultant surface was employed to execute electrocatalytic oxygen reduction reactions (ORR). By analyzing hydrodynamic voltammograms, it was confirmed that ORR undergoes a 2etransfer pathway and H2O2 is generated on the Au-GCE surface having a standard rate constant (ko) of 5.48 × 10−9 cm s−1 at +0.05 V vs. Ag/AgCl (sat. KCl) in 0.1 M H2SO4. The in-situ generated H2O2 can degrade methylene blue (MB) via Electro-Fenton process. The MB degradation was found to match well with the 1st order kinetic model with a homogeneous rate constant of 4.36 ×10−3 min-1.

Original languageEnglish
Article number136966
JournalElectrochimica Acta
Volume360
DOIs
Publication statusPublished - 2020 Nov 10
Externally publishedYes

Keywords

  • Electro-Fenton process
  • Electro-kinetics
  • Electroless Au deposition
  • Methylene blue degradation
  • Oxygen reduction reaction

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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