Open AccessHexanediamine Monolayer Electrografted at Glassy Carbon Electrodes Enhances Oxygen Reduction Reaction in Aqueous Neutral Media
Author(s) -
Hairul Hisham Hamzah,
Najahtul Najihah Ahmad Kamal,
Marta Meneghello,
Saiful Arifin Shafiee,
Turgut Sönmez,
Mohamad Nurul Azmi,
Shazarizul Haziq Mohd Samsuri,
Meor Faisal Meor Zulkifli
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/abcb77
Subject(s) - monolayer , glassy carbon , electrochemistry , chemistry , electrode , aqueous solution , oxygen , platinum , cyclic voltammetry , inorganic chemistry , electron transfer , diffusion , carbon fibers , analytical chemistry (journal) , materials science , photochemistry , organic chemistry , catalysis , biochemistry , physics , composite material , composite number , thermodynamics
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.