Enhancing catalytic activity by narrowing local energy gaps - X-ray studies of a manganese water oxidation catalyst

Jie Xiao, Munirah Khan, Archana Singh, Edllira Suljoti, Leone Spiccia, Emad Aziz

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Abstract

Changes in the local electronic structure of the Mn 3d orbitals of a Mn catalyst derived from a dinuclear MnIII complex during the water oxidation cycle were investigated ex situ by X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) analyses. Detailed information about the Mn 3d orbitals, especially the local HOMO–LUMO gap on Mn sites revealed by RIXS analyses, indicated that the enhancement in catalytic activity (water oxidation) originated from the narrowing of the local HOMO–LUMO gap when electrical voltage and visible light illumination were applied simultaneously to the Mn catalytic system
Original languageEnglish
Pages (from-to)872-877
Number of pages6
JournalChemSusChem
Volume8
Issue number5
DOIs
Publication statusPublished - 2015

Keywords

  • charge transfer
  • electrochemistry
  • manganese
  • water chemistry
  • x-ray absorption spectroscopy

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  • ARC Centre of Excellence for Electromaterials Science

    Wallace, G. G. (Primary Chief Investigator (PCI)), Forsyth, M. (Chief Investigator (CI)), Macfarlane, D. (Chief Investigator (CI)), Officer, D. (Chief Investigator (CI)), Cook, M. J. (Chief Investigator (CI)), Dodds, S. (Chief Investigator (CI)), Spinks, G. (Chief Investigator (CI)), Alici, G. (Chief Investigator (CI)), Moulton, S. E. (Chief Investigator (CI)), in het Panhuis, M. (Chief Investigator (CI)), Kapsa, R. M. I. (Chief Investigator (CI)), Higgins, M. (Chief Investigator (CI)), Mozer, A. (Chief Investigator (CI)), Crook, J. (Chief Investigator (CI)), Innis, P. (Chief Investigator (CI)), Coote, M. L. (Chief Investigator (CI)), Wang, X. (Chief Investigator (CI)), Howlett, P. (Chief Investigator (CI)), Pringle, J. (Chief Investigator (CI)), Hancock, L. (Chief Investigator (CI)), Paull, B. (Chief Investigator (CI)), Sparrow, R. (Chief Investigator (CI)), Zhang, J. (Chief Investigator (CI)), Spiccia, L. (Chief Investigator (CI)), Diamond, D. (Partner Investigator (PI)), Guldi, D. (Partner Investigator (PI)), Kim, S. J. (Partner Investigator (PI)), Unwin, P. (Partner Investigator (PI)) & Watanabe, M. (Partner Investigator (PI))

    ARC - Australian Research Council

    30/06/14 → 30/06/21

    Project: Research

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