Synthesis and Evaluation of Graphene Aerogel-Supported MnxFe3-xO4 for Oxygen Reduction in Urea/O-2 Fuel Cells
- Authors
- Bejigo, Keyru Serbara; Park, Bang Ju; Kim, Ji Hyeon; Yoon, Hyon Hee
- Issue Date
- May-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- oxygen reduction reaction; urea fuel cell; anode catalyst; manganese ferrite; graphene aerogel
- Citation
- CHEMISTRYOPEN, v.8, no.5, pp.615 - 620
- Journal Title
- CHEMISTRYOPEN
- Volume
- 8
- Number
- 5
- Start Page
- 615
- End Page
- 620
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/1555
- DOI
- 10.1002/open.201900105
- ISSN
- 2191-1363
- 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/O-2 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/O-2 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 mWcm(-2) at 60 degrees C. Thus, this work shows that 3D structured graphene aerogelsupported MnFe2O4 catalysts can be used as an efficient cathode material for alkaline fuel cells.
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