In:
Nano, World Scientific Pub Co Pte Ltd, Vol. 11, No. 11 ( 2016-11), p. 1650126-
Abstract:
Development of efficient electrocatalysts for the oxygen reduction reaction (ORR) remains a key issue for the commercialization of metal-air batteries. In this study, the novel structured Co 3 O 4 nanoparticles-modified [Formula: see text]-MnO 2 nanorods supported on reduced graphene oxide (Co 3 O 4 -MnO 2 /rGO) were synthesized with varying amounts of [Formula: see text]-MnO 2 via a facile two-step hydrothermal method. The relationship between the physical properties and the electrochemical results was investigated using X-ray diffraction spectrum, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammograms, electrochemical impedance spectroscopy and rotating disk electrode. The as-prepared Co 3 O 4 –MnO 2 nanohybrid exhibits enhanced catalytic activity for ORR under alkaline condition compared with MnO 2 /rGO and Co 3 O 4 /rGO. Furthermore, it mainly favors a direct 4e-reaction pathway for ORR, which is attributed to the well-designed structure, the synergistic effect between Co 3 O 4 and [Formula: see text]-MnO 2 , and the covalent coupling between the Co 3 O 4 -MnO 2 and reduced graphene oxide. The role of Co 3 O 4 in Co 3 O 4 –MnO 2 hybrid for catalyzing ORR also has been illustrated by varying the mass ratio of Co 3 O 4 and MnO 2 , which reveals that the Co 3 O 4 –MnO 2 with the ratio of 1:1 has better catalytic activity.
Type of Medium:
Online Resource
ISSN:
1793-2920
,
1793-7094
DOI:
10.1142/S1793292016501265
Language:
English
Publisher:
World Scientific Pub Co Pte Ltd
Publication Date:
2016
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