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Enhancing Catalytic Activity by Narrowing Local Energy Gaps—X‐Ray Studies of a Manganese Water Oxidation Catalyst
Author(s) -
Xiao Jie,
Khan Munirah,
Singh Archana,
Suljoti Edlira,
Spiccia Leone,
Aziz Emad F.
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201403219
Subject(s) - x ray absorption spectroscopy , manganese , catalysis , homo/lumo , resonant inelastic x ray scattering , x ray photoelectron spectroscopy , spectroscopy , absorption spectroscopy , x ray spectroscopy , chemistry , band gap , scattering , atomic orbital , photochemistry , electronic structure , absorption (acoustics) , catalytic cycle , materials science , physics , inelastic scattering , optics , nuclear magnetic resonance , molecule , optoelectronics , computational chemistry , inelastic neutron scattering , composite material , biochemistry , quantum mechanics , electron , organic chemistry
Changes in the local electronic structure of the Mn 3d orbitals of a Mn catalyst derived from a dinuclear Mn III 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.