Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 18, Pages 23073-23079Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.09.111
Keywords
CeO2@MnO2; Core-shell; Catalyst; Oxygen reduction reaction; Hydrothermal
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Funding
- National Key R&D Program of China [2016YFB0301102-2]
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A novel MnO2 nanosheet-coated CeO2 nanosphere (CeO2@MnO2) core-shell composite was successfully prepared by a simple two-step hydrothermal process as efficient catalyst for oxygen reduction reaction (ORR). XRD, XPS, SEM and TEM analysis techniques were sequentially employed to evidence this CeO2 core-MnO2 shell structure. When utilized for ORR catalyst, such hierarchical core-shell structured CeO2@MnO2 composite delivers a superior electrocatalytic activity than that of MnO2 nanoflowers and CeO2 nanospheres, which is in close proximity to that of commercial 20 wt% Pt/C in alkaline solution, and also exhibits an excellent durability. These properties make the composite potential as cathode catalyst for metal-air battery application. In addition, the enhanced mechanism arising from the synergetic effect of the MnO2 and CeO2 was preliminarily discussed.
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