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allied
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Materials-Metals 2017
Page 59
November 16-17, 2017 Paris, France
13
th
Annual Conference on
Materials Science, Metal and Manufacturing
Journal of Materials Science and Nanotechnology
Volume 1 Issue 2
Synthesis and characterizations of (2 × 2) tunnels
structured manganese dioxide nanorods with α
phase for lithium air batteries
Zafar Khan Ghouri
and
Saeed Al Meer
Qatar University, Qatar
T
he (2 × 2) tunnels structuredmanganese dioxide nanorods
with α phase (α-MnO
2
) are synthesized via simplistic
hydrothermal method at low temperature. The obtained
tunnels structured α–MnO
2
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 α–MnO
2
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
~4000 mAh/g with the tunnels structured α–MnO
2
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.
zafarkhan.ghouri@qu.edu.qaMater Sci Nanotechnol 2017, 1:2