Direct Formation of 2D-MnOx under Conditions of Water Oxidation Catalysis

Rosalie K. Hocking, Rosalind J. Gummow, Hannah J. King, Mayada Sabri, Peter Kappen, Christian Dwyer, Shery L.Y. Chang

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We describe the synthesis and characterization of a novel 2D-MnOx material using a combination of HR-TEM, XAS, XRD, and reactivity measurements. The ease with which the 2D material can be made and the conditions under which it can be made implies that water oxidation catalysts previously described as "birnessite-like" (3D) may be better thought of as 2D materials with very limited layer stacking. The distinction between the materials as being "birnessite-like" and "2D" is important because it impacts on our understanding of the function of these materials in the environment and as catalysts. The 2D-MnOx material is noted to be a substantially stronger chemical oxidant than previously noted for other birnessite-like manganese oxides. The material is shown to both "directly" and "catalytically" oxidize water in the presence of Ce4+, and to directly oxidize H2O2 in the absence of any other oxidant.

Original languageEnglish (US)
Pages (from-to)1603-1611
Number of pages9
JournalACS Applied Nano Materials
Volume1
Issue number4
DOIs
StatePublished - Apr 27 2018

Keywords

  • birnessite
  • catalysis
  • metal oxide
  • nanoparticles
  • redox
  • transmission electron microscopy
  • water-oxidation
  • X-ray absorption spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)

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