Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 6, Issue 5, Pages 1582-1588Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ee40321a
Keywords
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Funding
- MRSEC Program of the National Science Foundation [DMR-0819762]
- Eni S.p.A under the Eni-MIT Alliance Solar Frontiers
- DOE Hydrogen Initiative program [DE-FG02-05ER15728]
- NSERC
- NRC
- CIHR
- University of Saskatchewan
- Office of Science, Office of Basic Energy Sciences, of the US Department of Energy [DE-AC02-05CH11231]
- NRF-CRP [NRF2008NRF-CRP002-024]
- Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- National Science Foundation Graduate Research Fellowship [DGE-1122374]
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We report that the oxygen reduction reaction (ORR) activities of (001)-oriented manganese perovskite films decrease from 10 to 1 nm by more than an order of magnitude, which can be attributed to the barrier associated with interfacial band bending that impedes electron transfer to the electrolyte, and reduction of Mn3+ due to charge transfer from the Nb:SrTiO3 substrate. Furthermore, we show by substitution in La1-x(Ca,Sr)(x)MnO3 that Mn3+, not Mn4+, is the active valence state for ORR.
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