Journal
SUPERLATTICES AND MICROSTRUCTURES
Volume 90, Issue -, Pages 184-190Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.spmi.2015.12.012
Keywords
Tunnels structure; alpha-MnO2; Nanorods; Cyclic voltammetry; Lithium air batteries; Air cathode
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Funding
- National Research Foundation of Korea (NRF) Grant - Korean Government (MSIP) [2014R1A4A1008140]
- IT R&D Program of MKE/KEIT [10041957]
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The (2 x 2) tunnels structured manganese dioxide nanorods with a phase (alpha-MnO2) are synthesized via simplistic hydrothermal method at low temperature. The obtained tunnels structured alpha-MnO2 nanorods are characterized by, Transmission electron microscopy, Scanning electron microscopy, and X-ray diffraction techniques. The oxygen reduction reaction (ORR) activity was studied by cyclic voltammetry and rotating ring-disc electrode voltammetry techniques in alkaline media. Moreover; the highly electrocatalytic tunnels structured alpha-MnO2 nanorods were then also applied as cathode in rechargeable Li-O-2 cells. The Li-O-2 cells exhibited initial discharge capacity as high as similar to 4000 mAh/g with the tunnels structured alpha-MnO2 nanorods which was double the original capacity of the cells without any catalyst. Also we obtained 100% round trip efficiency upon cycling with limited capacity for more than 50 cycles. (C) 2015 Elsevier Ltd. All rights reserved.
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