Hexanediamine monolayer electrografted at glassy carbon electrodes enhances oxygen reduction reaction in aqueous neutral media

• المؤلفون الرئيسيون: Hamzah, Hairul Hisham, Ahmad Kamal, Najahtul Najihah, Meneghello, Marta, Shafiee, Saiful 'Arifin, Sönmez, Turgut, Mohamad Taib, Mohamad Nurul Azmi, Mohd Samsuri, Mohd Samsuri, Meor Zulkifli, Meor Faisal
• التنسيق: مقال
• اللغة: English
• منشور في: Electrochemical Society, Inc. 2020
• الموضوعات: QD Chemistry; TP250 Industrial electrochemistry
• الوصول للمادة أونلاين: http://irep.iium.edu.my/87040/1/Hexanediamine%20Monolayer%20Electrografted%20at%20Glassy%20Carbon%20Electrodes%20Enhances%20Oxygen%20Reduction%20Reaction%20in%20Aqueous%20Neutral%20Media.pdf; http://irep.iium.edu.my/87040/; https://iopscience.iop.org/article/10.1149/1945-7111/abcb77

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.