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Issue 43, 2015
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Tuning oxide activity through modification of the crystal and electronic structure: from strain to potential polymorphs

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Abstract

Discovering new materials with tailored chemical properties is vital for advancing key technologies in catalysis and energy conversion. One strategy is the modification of a material's crystal structure, and new methods allow for the synthesis and stabilization of potential materials in a range of crystal polymorph structures. We assess the potential reactivity of four metastable oxide polymorphs of MO2 (M = Ru, Rh, Pt, Ir) transition metal oxides. In spite of the similar local geometry and coordination between atoms in the metastable polymorphic and stable rutile structure, we find that polymorph reactivities cannot be explained by strain alone and offer tunable reactivity and increased stability. Atom-projected density of states reveals that the unique reactivity of polymorphs are caused by a redistribution of energy levels of the t2g-states. This structure–activity relationship is induced by slight distortions to the M–O bonds in polymorphic structures and is unattainable by strain. We predict columbite IrO2 to be more active than rutile IrO2 for oxygen evolution.

Graphical abstract: Tuning oxide activity through modification of the crystal and electronic structure: from strain to potential polymorphs

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Publication details

The article was received on 14 Aug 2015, accepted on 28 Sep 2015 and first published on 30 Sep 2015


Article type: Paper
DOI: 10.1039/C5CP04840K
Author version available: Download Author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2015,17, 28943-28949
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    Tuning oxide activity through modification of the crystal and electronic structure: from strain to potential polymorphs

    Z. Xu and J. R. Kitchin, Phys. Chem. Chem. Phys., 2015, 17, 28943
    DOI: 10.1039/C5CP04840K

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