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Defect-Engineered Al2CO/Al2Se3 Heterostructure for Enhanced Photocatalytic Water Splitting.

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|January 19, 2026
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Summary
This summary is machine-generated.

Intrinsic defects in Al2CO/Al2Se3 heterostructures significantly impact photocatalytic water splitting. Oxygen vacancies enhance electronic stability and enable hydrogen and oxygen evolution reactions, making the material promising for photocatalysis.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Physical Chemistry

Background:

  • Photocatalysis is crucial for sustainable energy solutions.
  • Understanding defect influence on material properties is key for catalyst design.
  • Al2CO/Al2Se3 heterostructures show potential for photocatalytic applications.

Purpose of the Study:

  • Investigate the effect of intrinsic defects on Al2CO/Al2Se3 heterostructure photocatalysis.
  • Determine how vacancies influence electronic band structure and band edge alignment.
  • Assess the potential for hydrogen and oxygen evolution reactions.

Main Methods:

  • First-principles calculations were employed.
  • Electronic band structure and charge transfer were analyzed.
  • Thermodynamics of water splitting reactions (HER and OER) were modeled.

Main Results:

  • Oxygen and carbon vacancies increased the bandgap, while aluminum vacancies induced a semiconductor-to-metal transition.
  • Oxygen vacancies facilitated charge transfer and stabilized the heterojunction via van der Waals interactions.
  • The heterostructure with oxygen vacancies demonstrated suitability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).

Conclusions:

  • Intrinsic defects, particularly oxygen vacancies, are critical for tuning the photocatalytic activity of Al2CO/Al2Se3.
  • The modified band alignment and gap states due to oxygen vacancies enable efficient water reduction.
  • The Al2CO/Al2Se3 heterostructure with oxygen vacancies shows promise for photocatalytic water splitting, with favorable thermodynamics for HER and a manageable overpotential for OER.