Hexanediamine Monolayer Electrografted at Glassy Carbon Electrodes Enhances Oxygen Reduction Reaction in Aqueous Neutral Media


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Sönmez T.

Journal Of The Electrochemical Society, no.166508, ss.1-9, 2020 (SCI İndekslerine Giren Dergi)

  • Basım Tarihi: 2020
  • Dergi Adı: Journal Of The Electrochemical Society
  • Sayfa Sayıları: ss.1-9

Özet

This study presents for the first time the electrocatalytic behaviour of hexanediamine (HDA) monolayer electrografted at glassy

carbon (GC) electrodes that enhanced oxygen reduction reaction (ORR) in aqueous neutral media. HDA modified GC electrodes

gave a higher current density than platinum bare electrodes based on the cyclic voltammograms (CV), although a ∼0.21 V vs. Ag/

AgCl higher onset potential was observed at −0.1 mA cm-2. Electrochemical impedance spectra (EIS) showed that the

electrocatalytic reaction on HDA monolayer film towards dissolved oxygen molecules is controlled by diffusion and charge

transfer processes. From the scan rate studies and the Laviron equation, it was found that the ORR on this modified electrode

proceeded via a fast four-electrons transfer.