Journal
MATERIALS RESEARCH BULLETIN
Volume 44, Issue 6, Pages 1323-1327Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2008.12.009
Keywords
Layered compounds Oxides; Atomic force microscopy X-ray diffraction; Electrochemical properties
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Funding
- JFE 21st Century Foundation
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Potentiostatic electrolysis of a mixed aqueous solution of Bu4NBr and MnSo(4) at +1.0 V (vs. Ag/AgCl) on Pt electrode led to the oxidation of Br- and Mn2+ ions. X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and X-ray diffraction (XRD) revealed that this anodic process was followed by the deposition of insulating crystals of bromide salt of Bu4N+ and the subsequent formation of layered manganese oxide in the interstitial spaces of the bromide grains already grown. Dissolution of the bromide crystals in water left a well-dispersed porous texture composed of manganese oxide nanosheets. The resulting MnOx-modified electrode exhibited a larger catalytic current for the reduction of oxygen in alkaline solution, compared to the bare Pt electrode. (C) 2008 Elsevier Ltd. All rights reserved.
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