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Nanomaterials 2016, 6(1), 21;

Investigation of MnO2 and Ordered Mesoporous Carbon Composites as Electrocatalysts for Li-O2 Battery Applications

Department of Applied Chemistry, National University of Kaohsiung, Kaohsiung City 811, Taiwan
Author to whom correspondence should be addressed.
Academic Editors: Hermenegildo García and Sergio Navalón
Received: 9 November 2015 / Revised: 14 December 2015 / Accepted: 12 January 2016 / Published: 18 January 2016
(This article belongs to the Special Issue Nanoparticles for Catalysis)
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The electrocatalytic activities of the MnO2/C composites are examined in Li-O2 cells as the cathode catalysts. Hierarchically mesoporous carbon-supported manganese oxide (MnO2/C) composites are prepared using a combination of soft template and hydrothermal methods. The composites are characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, small angle X-ray scattering, The Brunauer–Emmett–Teller (BET) measurements, galvanostatic charge-discharge methods, and rotating ring-disk electrode (RRDE) measurements. The electrochemical tests indicate that the MnO2/C composites have excellent catalytic activity towards oxygen reduction reactions (ORRs) due to the larger surface area of ordered mesoporous carbon and higher catalytic activity of MnO2. The O2 solubility, diffusion rates of O2 and O2•− coefficients (DO2 and DO2), the rate constant (kf) for producing O2•−, and the propylene carbonate (PC)-electrolyte
decomposition rate constant (k) of the MnO2/C material were measured by RRDE experiments in the 0.1 M TBAPF6/PC electrolyte. The values of kf and k for MnO2/C are 4.29 × 10−2 cm·s−1 and 2.6 s−1, respectively. The results indicate that the MnO2/C cathode catalyst has higher electrocatalytic activity for the first step of ORR to produce O2•− and achieves a faster PC-electrolyte decomposition rate. View Full-Text
Keywords: MnO2/C; cathode; lithium-oxygen battery; rotating ring-disk electrode MnO2/C; cathode; lithium-oxygen battery; rotating ring-disk electrode

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Chin, C.-C.; Yang, H.-K.; Chen, J.-S. Investigation of MnO2 and Ordered Mesoporous Carbon Composites as Electrocatalysts for Li-O2 Battery Applications. Nanomaterials 2016, 6, 21.

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