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Self-sustaining bioelectrochemical cell from fungal degradation of lignin-rich agrowaste

Wan Mohd. Sukri, Wan Nur Asiah and Othman, Raihan and Abd-Wahab, Firdaus and Mohamed Noor, Noraini (2021) Self-sustaining bioelectrochemical cell from fungal degradation of lignin-rich agrowaste. Energies, 14 (8). pp. 1-11. ISSN 1996-1073

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The present work describes a self-sustaining bioelectrochemical system that adopts simple cell configurations and operates in uncontrolled ambient surroundings. The microbial fuel cell (MFC) was comprised of white-rot fungus of Phanaerochaete chrysosporium fed with oil palm empty fruit bunch (EFB) as the substrate. This fungal strain degrades lignin by producing ligninolytic enzymes such as laccase, which demonstrates a specific affinity for oxygen as its electron acceptor. By simply pairing zinc and the air electrode in a membraneless, single-chamber, 250-mL enclosure, electricity could be harvested. The microbial zinc/air cell is capable of sustaining a 1 mA discharge current continuously for 44 days (i.e., discharge capacity of 1056 mAh). The role of the metabolic activities of P. chrysosporium on EFB towards the MFC’s performance is supported by linear sweep voltammetry measurement and scanning electron microscopy observations. The ability of the MFC to sustain its discharge for a prolonged duration despite the fungal microbes not being attached to the air electrode is attributed to the formation of a network of filamentous hyphae under the submerged culture. Further, gradual lignin decomposition by fungal inocula ensures a continuous supply of laccase enzyme and radical oxidants to the MFC. These factors promote a self-sustaining MFC devoid of any control features.

Item Type: Article (Journal)
Additional Information: 2593/89279
Uncontrolled Keywords: Microbial zinc/air cell; Phanaerochaete chrysosporium; white-rot fungus; membraneless MFC; lignin-rich agrowaste
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ807 Renewable energy sources
T Technology > TP Chemical technology > TP248.13 Biotechnology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Science
Depositing User: Raihan Othman
Date Deposited: 11 Apr 2021 09:56
Last Modified: 23 Jun 2021 16:16
URI: http://irep.iium.edu.my/id/eprint/89279

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