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This study reveals that specific electronic structures in titanium sesquioxide (Ti2O3) polymorphs significantly enhance hydrogen evolution. Epitaxial stabilization of novel Ti2O3 forms unlocks efficient oxide electrocatalysts for hydrogen production.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Transition metal oxides are known for structure-property correlations, widely used in oxygen electrocatalysis.
  • High-performance oxide electrocatalysts for hydrogen evolution are scarce, with mechanisms poorly understood.

Purpose of the Study:

  • To investigate the relationship between electronic structure and hydrogen electrocatalytic activity in Ti2O3.
  • To develop efficient oxide-based electrocatalysts for hydrogen evolution using epitaxial stabilization.

Main Methods:

  • Utilizing epitaxial stabilization to create bulk-absent Ti2O3 polymorphs in film form.
  • Investigating electronic reconstructions within these novel polymorphs.
  • Correlating electronic properties with hydrogen evolution reaction (HER) activity.

Main Results:

  • Successfully stabilized bulk-absent Ti2O3 polymorphs via epitaxial stabilization.
  • Observed electronic reconstructions in these polymorphs, linked to enhanced HER activity.
  • Identified a smaller charge-transfer energy and stronger Ti 3d-O 2p orbital hybridization as key factors for improved electrocatalytic efficiency.

Conclusions:

  • Electronic structure plays a critical role in the hydrogen evolution activity of oxide electrocatalysts.
  • Epitaxial stabilization of bulk-absent polymorphs offers a viable strategy for designing efficient oxide-based hydrogen electrocatalysts.