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On the Origin of the Improvement of Electrodeposited MnOx Films in Water Oxidation Catalysis Induced by Heat Treatment.

Abstract
Manganese oxides (MnOx ) are considered to be promising catalysts for water oxidation. Building on our previous studies showing that the catalytic activity of MnOx films electrodeposited from aqueous electrolytes is improved by a simple heat treatment, we have explored the origin of the catalytic enhancement at an electronic level by X-ray absorption spectroscopy (XAS). The Mn L-edge XA spectra measured at various heating stages were fitted by linear combinations of the spectra of the well-defined manganese oxides-MnO, Mn3 O4 , Mn2 O3 , MnO2 and birnessite. This analysis identified two major manganese oxides, Mn3 O4 and birnessite, that constitute 97 % of the MnOx films. Moreover, the catalytic improvement on heat treatment at 90 °C is related to the conversion of a small amount of birnessite to the Mn3 O4 phase, accompanied by an irreversible dehydration process. Further dehydration at higher temperature (120 °C), however, leads to a poorer catalytic performance.
AuthorsMunirah Khan, Jie Xiao, Fengling Zhou, Mikhail Yablonskikh, Douglas R MacFarlane, Leone Spiccia, Emad F Aziz
JournalChemSusChem (ChemSusChem) Vol. 8 Issue 11 Pg. 1980-5 (Jun 08 2015) ISSN: 1864-564X [Electronic] Germany
PMID25940315 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Copyright© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Chemical References
  • Manganese Compounds
  • Oxides
  • Water
  • manganese oxide
Topics
  • Catalysis
  • Electrochemistry
  • Hot Temperature
  • Manganese Compounds (chemistry)
  • Oxidation-Reduction
  • Oxides (chemistry)
  • Water (chemistry)

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