Rahim, Siti Aqilah Nadhirah Md and Lee, Ching Shya and Abnisa, Faisal and Wan Daud, Wan Mohd Ashri and Aroua, Mohamed Kheireddine and Cognet, Patrick and Peres, Yolande (2022) Activated carbon-based electrodes for two-steps catalytic/ electrocatalytic reduction of glycerol in Amberlyst-15 mediator. Chemosphere, 295. ISSN 0045-6535, DOI https://doi.org/10.1016/j.chemosphere.2022.133949.
Full text not available from this repository.Abstract
Redox mediators supply an effective way to promote electrons (and protons) transport between the electrode and substrate without being in direct physical contact with the electrode. Here, the carbon-based electrodes with Amberlyst-15 as the redox mediator were used in the electrocatalytic reduction to investigate their ability to indirectly convert glycerol into 1,2-propanediol. The process aims to study the influence of different activated carbon compositions (60%, 70%, 80%, and 90% of total weight) in the activated carbon composite (ACC) electrodes on the electrochemical properties, reaction mechanisms, and selectivity of the yielded products. Their electrochemical behavior , physicochemical properties were determined by cyclic voltammetry (CV) and chronoamperometry (CA), followed by FESEM-EDX for the selected ACC electrode. Electroactive surface area (EASA) plays a role in glycerol mass transport and electrons transfer. EASA of 60ACC, 70ACC, 80ACC , 90ACC (geometrical surface area of 0.50 cm2) were 19.62, 24.50, 36.74 and 30.83 cm(2), respectively. With the highest EASA, 80ACC enhanced the mass transport and electrons transfer process that eventually improved its electrocatalytic activity. It outperformed other ACC electrodes by generating Amberlyst-15 radicals (A-15'-) with high current density at low potential (-0.5 V vs. Ag/AgCl). A-15'- served as the electron-donor for the homo-geneous redox reaction with glycerol in delivering highly reactive glycerol radical for further intermediates development and generated 1,2-propanediol at-2.5 V vs. Ag/AgCl (current density of-0.2018 A cm-2). High activated carbon content portrayed a dominant role in controlling EASA and favored consecutive acetol-1,2-propanediol production through the C-O bond breakage. From the galvanostatic electrolysis, 1,2-propanediol selectivity was higher on 80ACC (88.6%) compared to 60ACC (61.4%), 70ACC (70.4%) and 90ACC (72.5%). Diethylene glycol formation was found to be the side reaction but preferred low activated carbon percentage in 60ACC and 70ACC.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Education (Department of Higher Education), Malaysia [FP046-2017A] |
| Uncontrolled Keywords: | Indirect electrolysis; Redox mediator; Hydroxyacetone; 1,2-Propanediol; Mechanism pathway; Diethylene glycol |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences G Geography. Anthropology. Recreation > GF Human ecology. Anthropogeography |
| Divisions: | Faculty of Engineering > Department of Chemical Engineering Deputy Vice Chancellor (Research & Innovation) Office |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 11 Aug 2022 00:51 |
| Last Modified: | 11 Aug 2022 00:51 |
| URI: | http://eprints.um.edu.my/id/eprint/32726 |
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