Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 22, Pages 9331-9337Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b02801
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Funding
- Center for Alkaline Based Energy Solutions (GABES), part of the Energy Frontier Research Center (EFRC) program - U.S. Department of Energy [DE-SC-0019445]
- National Science Foundation Materials Research Science and Engineering Center (NSF MRSEC) program [DMR-1719875]
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The search for nonprecious metal-based electrocatalysts with high activity and long durability for the oxygen reduction reaction (ORR) has been long pursued by the renewable energy material community. Here, we designed a new Mn-Co bimetallic oxide MnCo2O3/C with the rock-salt-type structure, derived from a spinel-type precursor MnCo2O4/C under mild reduction using NH3 at 300 degrees C. In-depth electron microscopic and spectroscopic investigations suggest that MnCo2O3/C predominantly has Mn(II) and Co(II) and can be written as MnO(CoO)(2)/C. Charge transfer between Mn and Co was probed by electron energy-loss near-edge structure (ELNES) analysis. MnCo2O3/C has a Co-rich core and a thin 1-3 nm Mn shell with a mesoporous morphology. MnCo2O3/C achieved a high ORR activity with a half-wave potential of 0.86 V in 1 M KOH, which was ascribed to the microstructure and the synergistic effects between Mn and Co, serving as co-active sites for the ORR.
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