NDLI: Synthesis and characterization of different MnO$_{2}$ morphologies for lithium-air batteries

Content Provider	SpringerLink
Author	Choi, Hyun A Jang, Hyuk Hwang, Hyein Choi, Mincheol Lim, Dongwook Shim, Sang Eun Baeck, Sung Hyeon
Copyright Year	2014
Abstract	Manganese dioxide (MnO$_{2}$) was synthesized in the forms of nanorods, nanoparticles, and mesoporous structures and the characteristics of these materials were investigated. Crystallinities were studied by x-ray diffraction and morphologies by scanning and transmission electron microscopy. Average pore sizes and specific surface areas were analyzed using the Barret-Joyner-Halenda and Brunauer-Emmett-Teller methods, respectively. Samples were also studied by cyclic voltammetry using 1M aqueous KOH solution saturated with either O$_{2}$ or N$_{2}$ as electrolytes to investigate their ORR (oxygen reduction reaction) and OER (oxygen evolution reaction) activities. Of the samples produced, mesoporous MnO$_{2}$ exhibited the highest ORR and OER catalytic activities. Mesoporous MnO$_{2}$ supported on a gas diffusion layer was also used as a catalyst on the air electrode (cathode) of a lithium-air battery in organic electrolyte. The charge-discharge behavior of mesoporous MnO$_{2}$ was investigated at a current density 0.2 mAcm$^{−2}$ in a pure oxygen environment. Mesoporous MnO$_{2}$ electrodes showed stable cycleability up to 65 cycles at a cell capacity of 700 mAhg$^{−1}$.
Starting Page	957
Ending Page	962
Page Count	6
File Format	PDF
ISSN	17388090
Journal	Electronic Materials Letters
Volume Number	10
Issue Number	5
e-ISSN	20936788
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2014-09-10
Publisher Place	Springer
Access Restriction	Subscribed
Subject Keyword	lithium-air battery air electrode manganese oxide mesoporous gas diffusion layer Optical and Electronic Materials Condensed Matter Physics Nanotechnology and Microengineering Characterization and Evaluation of Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials

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