Journal
ELECTROANALYSIS
Volume 34, Issue 8, Pages 1245-1255Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.202100601
Keywords
Microbial fuel cells; oxygen reduction reaction; air cathode; Fe3O4; CoO catalyst; zeolitic imidazolate framework
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Funding
- National Natural Science Foundation of China [22008134]
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The efficient oxygen reduction reaction (ORR) in microbial fuel cells (MFCs) can be achieved by using N-doped transition metal oxides as catalysts. In this study, non-precious N-doped Fe3O4/CoO@NC-T catalysts were prepared using a two-step strategy and showed exceptional ORR activity. Among the catalysts, Fe3O4/CoO@NC-750 exhibited the best performance with superior power density and electrochemical stability compared to commercial Pt/C catalyst in MFCs.
N-doped transition metal oxides are strategic materials towards the efficient oxygen reduction reaction (ORR) of microbial fuel cells (MFCs). Non-precious N-doped Fe3O4/CoO@NC-T (T represents carbonization temperature) catalysts are prepared by an efficient two-step strategy for ORR. Fe3O4/CoO@NC-750 exhibits the best performance with an efficient four-electron transfer pathway. The optimal power density of MFCs by using Fe3O4/CoO@NC-750 as the cathode catalyst (1243.4 mW . m(-2)) is superior to that of the MFCs with commercial Pt/C catalyst (1080 mW . m(-2)), which shows an outstanding activity towards ORR. No significant decrease in output voltage results over 70 days, which shows an excellent electrochemical stability.
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