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Nanomaterials 2016, 6(11), 203; doi:10.3390/nano6110203

The Use of Spray-Dried Mn3O4/C Composites as Electrocatalysts for Li–O2 Batteries

Department of Applied Chemistry, National University of Kaohsiung, Kaohsiung City 81148, Taiwan
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Academic Editor: Thomas Nann
Received: 20 October 2016 / Revised: 20 October 2016 / Accepted: 31 October 2016 / Published: 7 November 2016
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Abstract

The electrocatalytic activities of Mn3O4/C composites are studied in lithium–oxygen (Li–O2) batteries as cathode catalysts. The Mn3O4/C composites are fabricated using ultrasonic spray pyrolysis (USP) with organic surfactants as the carbon sources. The physical and electrochemical performance of the composites is characterized by X-ray diffraction, scanning electron microscopy, particle size analysis, Brunauer–Emmett–Teller (BET) measurements, elemental analysis, galvanostatic charge–discharge methods and rotating ring-disk electrode (RRDE) measurements. The electrochemical tests demonstrate that the Mn3O4/C composite that is prepared using Trition X-114 (TX114) surfactant has higher activity as a bi-functional catalyst and delivers better oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic performance in Li–O2 batteries because there is a larger surface area and particles are homogeneous with a meso/macro porous structure. The rate constant (kf) for the production of superoxide radical (O2) and the propylene carbonate (PC)-electrolyte decomposition rate constant (k) for M3O4/C and Super P electrodes are measured using RRDE experiments and analysis in the 0.1 M tetrabutylammonium hexafluorophosphate (TBAPF6)/PC electrolyte. The results show that TX114 has higher electrocatalytic activity for the first step of ORR to generate O2 and produces a faster PC-electrolyte decomposition rate. View Full-Text
Keywords: Mn3O4/C; cathode; lithium-oxygen battery; rotating ring-disk electrode Mn3O4/C; cathode; lithium-oxygen battery; rotating ring-disk electrode
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yang, H.-K.; Chin, C.-C.; Chen, J.-S. The Use of Spray-Dried Mn3O4/C Composites as Electrocatalysts for Li–O2 Batteries. Nanomaterials 2016, 6, 203.

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