Kumar, Ravinder and Singh, Lakhveer and Zularisam, A. W. (2017) Enhanced Oxygen Reduction Reaction In Air-Cathode Microbial Fuel Cells Using Flower-Like Co3O4 As An Efficient Cathode Catalyst. International Journal of Hydrogen Energy, 42 (30). pp. 19287-19295. ISSN 0360-3199. (Published)
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Abstract
In this study, the potential of mesoporous flower-like Co3O4 is investigated for the application of oxygen reduction reaction (ORR) in aqueous air-cathode microbial fuel cell (MFC). The flower-like Co3O4 was prepared by a hydrothermal route. The X-ray photoelectron spectroscopy results suggested that flower-like Co3O4 contained positively charged ions i.e., Co2+/Co3+ on its surface that probably acted as ORR active sites. The electrochemical tests demonstrated that flower-like Co3O4 enhanced the electrocatalytic activity of the cathode significantly as the onset potentials obtained in cyclic voltammetry and linear sweep voltammetry were more positive than the bare cathode. Besides, Tafel plots showed that Co3O4 increased the electron transfer kinetics and achieved an exchange current density of 2.46 A/m2, which was ∼30% higher than bare cathode. Subsequently, this improved ORR activity increased the power output in the MFC and a maximum power density of 248 mW/m2 was achieved, which was 6.3 times higher than the bare cathode. The higher ORR activity and improved electric output in the MFC could be attributed to the excellent electrocatalytic activity of Co2+/Co3+ and mesoporous nature of flower-like Co3O4 that exposed extra active sites for oxygen molecules on the cathode surface.
| Item Type: | Article |
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| Additional Information: | Indexes in Scopus. IF: 3.582 |
| Uncontrolled Keywords: | Microbial fuel cell; Oxygen reduction reaction; Flower-like Co3O4; Power density |
| Subjects: | T Technology > T Technology (General) |
| Faculty/Division: | Faculty of Engineering Technology Institute of Postgraduate Studies |
| Depositing User: | Mrs. Neng Sury Sulaiman |
| Date Deposited: | 08 Sep 2017 02:11 |
| Last Modified: | 28 Aug 2019 02:54 |
| URI: | http://umpir.ump.edu.my/id/eprint/18392 |
| Download Statistic: | View Download Statistics |
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