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- Title
Synthesis and Evaluation of Graphene Aerogel‐Supported Mn<sub>x</sub>Fe<sub>3−x</sub>O<sub>4</sub> for Oxygen Reduction in Urea/O<sub>2</sub> Fuel Cells.
- Authors
Bejigo, Keyru Serbara; Park, Bang Ju; Kim, Ji Hyeon; Yoon, Hyon Hee
- Abstract
Graphene aerogel‐supported manganese ferrite (MnxFe3−xO4/GAs) and reduced‐graphene oxide/manganese ferrite composite (MnFe2O4/rGO) were synthesized and studied as cathode catalysts for oxygen reduction reactions in urea/O2 fuel cells. MnFe2O4/GAs exhibited a 3D framework with a continuous macroporous structure. Among the investigated Fe/Mn ratios, the more positive oxygen reduction onset potential was observed with Fe/Mn=2/1. The half‐wave potential of MnFe2O4/GAs was considerably more positive than that of MnFe2O4/rGO and comparable with that of Pt/C, while the stability of MnFe2O4/GAs significantly higher than that of Pt/C. The best urea/O2 fuel cell performance was also observed with the MnFe2O4/GAs. The MnFe2O4/GAs exhibited an OCV of 0.713 V and a maximum power density of 1.7 mW cm−2 at 60 °C. Thus, this work shows that 3D structured graphene aerogel‐supported MnFe2O4 catalysts can be used as an efficient cathode material for alkaline fuel cells.
- Subjects
FUEL cells; OXYGEN reduction; MICROBIAL fuel cells; GRAPHENE synthesis; ALKALINE fuel cells; POWER density
- Publication
ChemistryOpen, 2019, Vol 8, Issue 5, p615
- ISSN
2191-1363
- Publication type
Article
- DOI
10.1002/open.201900105