Abstract
The need for an alternative electrocatalyst to replace Pt-based noble materials is a major concern of the Li–air battery technology. In this work, α-MnO2 nanorods are synthesized by a simple hydrothermal technique and are modified with palladium (Pd) nanoparticles to form Pd-deposited α-MnO2 (Pd/α-MnO2) nanostructures. The physical characteristics of the thus prepared materials are analyzed by X-ray diffraction (XRD), SEM, and Brunauer–Emmett–Teller (BET) techniques. These analyses confirmed the successful synthesis of 8∼10-nm-sized Pd nanoparticles deposited on 82∼85-nm-sized α-MnO2 nanorods. The catalytic activities of the synthesized Pd/α-MnO2 nanostructure for oxygen reduction reaction and evolution reaction were studied by measuring linear sweeping voltammograms in aqueous solution. The as-prepared material exhibited high electrocatalytic activities which were comparable to that of the commercial Pt/C catalysts. The Pd/α-MnO2 nanostructures were then examined as a bifunctional electrocatalyst in the air cathode of Li–air batteries in non-aqueous media. The Li–air batteries fabricated with the Pd/α-MnO2 catalyst deliver a high discharge capacity with low overpotential compared to the other batteries without Pd deposition or any catalyst.
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Acknowledgments
This work was supported by the Human Resources Development program (No. 20114030200060) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy. This work is also supported by the Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Education (No. 2013R1A1A2012656).
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Zahoor, A., Christy, M., Jeon, J.S. et al. Improved lithium oxygen battery performance by addition of palladium nanoparticles on manganese oxide nanorod catalysts. J Solid State Electrochem 19, 1501–1509 (2015). https://doi.org/10.1007/s10008-015-2739-5
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DOI: https://doi.org/10.1007/s10008-015-2739-5