Materials Science and Nanotechnology

Synthesis and characterizations of (2 × 2) tunnels structured manganese dioxide nanorods with α phase for lithium air batteries

13^th Annual Conference on Materials Science, Metal and Manufacturing
November 16-17, 2017 Paris, France

Zafar Khan Ghouri and Saeed Al Meer

Qatar University, Qatar

Posters & Accepted Abstracts : Mater Sci Nanotechnol

Abstract:

The (2 × 2) tunnels structured manganese dioxide nanorods with α phase (α-MnO2) are synthesized via simplistic hydrothermal method at low temperature. The obtained tunnels structured α–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 α–MnO2 nanorods were then also applied as cathode in rechargeable Li–O2 cells. The Li–O2 cells exhibited initial discharge capacity as high as ~4000 mAh/g with the tunnels structured α–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.

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