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Nickel Foam Supported-Co3O4 Nanowire Arrays for H2O2 Electroreduction

Authors :
Wang Guiling
Yinyi Gao
Jinling Yin
Dianxue Cao
Cuilei Yin
Lin Cheng
Source :
Chemistry of Materials. 21:5112-5118
Publication Year :
2009
Publisher :
American Chemical Society (ACS), 2009.

Abstract

Ni foam supported-Co3O4 nanowire arrays are prepared by a template-free growth method, followed by a thermal treatment in air, and are characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, infrared spectroscopy, and thermogravimetric and differential thermal analysis. The Co3O4 nanowires have a diameter of about 250 nm, a length up to 15 μm, and a Brunauer-Emmett-Teller surface area of 78.4 m2 g−1. They grow almost vertically from the surface of Ni foam skeleton, pack densely, and uniformly cover the entire surface of Ni foam skeleton. Electroreduction of H2O2 on Co3O4 nanowire arrays in alkaline medium is investigated by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The Co3O4 nanowire electrode exhibits superior activity, stability, and mass transport property for H2O2 electroreduction. A current density of 90 mA cm−2 is achieved at −0.4 V in 0.4 mol dm−3 H2O2 and 3.0 mol dm−3 NaOH at room temperature. The per gram current...

Details

ISSN :
15205002 and 08974756
Volume :
21
Database :
OpenAIRE
Journal :
Chemistry of Materials
Accession number :
edsair.doi...........4198a03b523497c4557689efb248e666
Full Text :
https://doi.org/10.1021/cm901928b