Journal
NANO RESEARCH
Volume 11, Issue 6, Pages 3282-3293Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1869-8
Keywords
perovskite oxide; nanocomposite; electrocatalysis; oxygen reduction; Zn-air batteries
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Funding
- National Key Research and Development Program of China [2017YFA0206700]
- National Natural Science Foundation of China (NSFC) [21231005, 21322101]
- 111 Project [B12015, IRT13R30]
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The conventional ceramic synthesis of perovskite oxides involves extended high-temperature annealing in air and is unfavorable to the in situ hybridization of the conductive agent, thus resulting in large particle sizes, low surface area and limited electrochemical activities. Here we report a rapid gel auto-combustion approach for the synthesis of a perovskite/carbon hybrid at a low temperature of 180 A degrees C. The energy-saving synthetic strategy allows the formation of small and homogeneously dispersed La (x) MnO3 +/-delta/C nanocomposites. Remarkably, the synthesized La0.99MnO3.03/C nanocomposite exhibits comparable oxygen reduction reaction (ORR) activity (with onset and peak potentials of 0.97 and 0.88 V, respectively) to the benchmark Pt/C due to the facilitated charge transfer, optimal e(g) electron filling of Mn, and coupled C-O-Mn bonding. Furthermore, the nanocomposite efficiently catalyzes a Zn-air battery that delivers a peak power density of 430 mW center dot cm(-2), an energy density of 837 W center dot h center dot kg(Zn) (-1) and 340 h stability at a current rate of 10 mA center dot cm(-2).
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