Iron based catalysts from novel low-cost organic precursors for enhanced oxygen reduction reaction in neutral media microbial fuel cells

Serov, Alexey; Stariha, Lydia; Kodali, Mounika; Gordon, Jonathan; Babanova, Sofia; Bretschger, Orianna; Artyushkova, Kateryna; Atanassov, Plamen; Santoro, Carlo

Abstract

© 2016 The Royal Society of Chemistry. Two iron-based platinum group metal-free catalysts for the oxygen reduction reaction (ORR) were synthesized from novel and low cost organic precursors named niclosamide and ricobendazole. These catalysts have been characterized, incorporated in a gas diffusional electrode and tested in "clean" conditions as well as in operating microbial fuel cell (MFC) for 32 days. Both catalysts demonstrated unprecedented performance yielding a power density 25% higher than that of platinum (Pt) and roughly 100% higher than activated carbon (AC) used as a control. Durability tests were performed and showed that Pt-based cathodes lost their activity within the first week of operation, reaching the level of the supporting AC-based electrode. Fe-ricobendazole, however, demonstrated the highest performance during the long-term study with a power density of 195 ± 7 μW cm-2 (day 2) that slightly decreased to 186 ± 9 μW cm-2 at day 29. Fe-niclosamide also outperformed Pt and AC but the power density roughly decreased with 20% for the 32 days of the study. Accelerated poisoning test using S2- as pollutant showed high losses in activity for Pt. Fe-niclosamide suffered higher losses compared to Fe-ricobendazole. Importantly, Fe-ricobendazole represents a 55-fold cost reduction compared to platinum.

• Journal Article Type: Article
• Acceptance Date: May 13, 2016
• Publication Date: Jul 1, 2016
• Deposit Date: Apr 23, 2018
• Publicly Available Date: May 2, 2018
• Journal: Energy and Environmental Science
• Print ISSN: 1754-5706
• Electronic ISSN: 1754-5706
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 7
• Pages: 2346-2353
• DOI: https://doi.org/10.1039/c6ee01145d
• Keywords: metal-free catalysts, oxygen reduction reaction (ORR), novel low-cost organic precursors, niclosamide, ricobendazole, microbial fuel cell (MFC)
• Public URL: https://uwe-repository.worktribe.com/output/912006
• Publisher URL: http://dx.doi.org/10.1039/C6EE01145D
• Contract Date: Apr 23, 2018