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Improvement of catalytic water oxidation on MnOx films by heat treatment.

Abstract
Manganese oxides (MnOx ) are considered to be promising catalysts for water oxidation. Electrodeposited MnOx films from aqueous electrolytes have previously been shown to exhibit a lower catalytic action than films deposited from ionic liquids when tested in strongly alkaline conditions. In this study, we describe a thermal treatment that converts the MnOx films deposited from aqueous electrolytes to highly catalytic films with comparable activity to ionic-liquid-deposited films. The films deposited from aqueous electrolytes show a remarkable improvement in the catalysis of water oxidation after heat treatment at a low temperature (≤120 °C) for 30 min. The films were characterised by using XRD and SEM, and energy-dispersive X-ray (EDX), FTIR and Raman spectroscopy, which indicate that dehydration occurs during the heat treatment without significant change to the microstructure or bulk composition. The X-ray absorption spectroscopy (XAS) results show the growth of small amounts (ca. 3-10 %) of reduced Mn species (Mn(II) or Mn(III) ) after heat treatment. The dehydration process removes structural water and hydroxyl species to result in a conductivity improvement and a more active catalyst, thereby contributing to the enhancement in water oxidation performance.
AuthorsFengling Zhou, Alex Izgorodin, Rosalie K Hocking, Vanessa Armel, Leone Spiccia, Douglas R Macfarlane
JournalChemSusChem (ChemSusChem) Vol. 6 Issue 4 Pg. 643-51 (Apr 2013) ISSN: 1864-564X [Electronic] Germany
PMID23460606 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Chemical References
  • Manganese Compounds
  • Oxides
  • Water
  • manganese oxide
Topics
  • Catalysis
  • Hot Temperature
  • Manganese Compounds (chemistry)
  • Microscopy, Electron, Scanning
  • Oxidation-Reduction
  • Oxides (chemistry)
  • Spectroscopy, Fourier Transform Infrared
  • Spectrum Analysis, Raman
  • Water (chemistry)
  • X-Ray Absorption Spectroscopy
  • X-Ray Diffraction

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