Synthesis and characterization of different MnOSu

Authors: HyunA Choi Hyuk Jang Hyein Hwang Mincheol Choi Dongwook Lim Sang Eun Shim SungHyeon Baeck

Publish Date: 2014/09/10

Volume: 10, Issue: 5, Pages: 957-962

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Abstract

Manganese dioxide MnO2 was synthesized in the forms of nanorods nanoparticles and mesoporous structures and the characteristics of these materials were investigated Crystallinities were studied by xray diffraction and morphologies by scanning and transmission electron microscopy Average pore sizes and specific surface areas were analyzed using the BarretJoynerHalenda and BrunauerEmmettTeller methods respectively Samples were also studied by cyclic voltammetry using 1M aqueous KOH solution saturated with either O2 or N2 as electrolytes to investigate their ORR oxygen reduction reaction and OER oxygen evolution reaction activities Of the samples produced mesoporous MnO2 exhibited the highest ORR and OER catalytic activities Mesoporous MnO2 supported on a gas diffusion layer was also used as a catalyst on the air electrode cathode of a lithiumair battery in organic electrolyte The chargedischarge behavior of mesoporous MnO2 was investigated at a current density 02 mAcm−2 in a pure oxygen environment Mesoporous MnO2 electrodes showed stable cycleability up to 65 cycles at a cell capacity of 700 mAhg−1

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