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Oxygen-Vacancy-Dominated Cocatalyst/Hematite Interface for Boosting Solar Water Splitting.

Lei Wang1,2,3, Jie Zhu1, Xianhu Liu3

  • 1College of Chemistry and Chemical Engineering and Inner Mongolia Key Lab of Nanoscience and Nanotechnology , Inner Mongolia University , Hohhot 010021 , China.

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Summary

This study enhances photoelectrochemical water splitting by treating hematite photoanodes with iron phosphate and argon plasma. This method boosts oxygen evolution reaction activity and overall performance.

Keywords:
Fe−Pihematiteoxygen vacanciesphotoelectrochemical water splittingplasma-induced defects

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Semiconductor surface states impede photoelectrochemical (PEC) water splitting efficiency.
  • Oxygen evolution cocatalysts improve performance but have limitations.

Purpose of the Study:

  • To develop a novel surface treatment for hematite photoanodes to enhance PEC water splitting.
  • To investigate the combined effects of iron phosphate coating and argon plasma treatment.

Main Methods:

  • A simple precipitation method to create an iron phosphate (Fe-Pi) layer on hematite (Fe2O3).
  • Argon plasma treatment to introduce oxygen vacancies on the Fe-Pi/Fe2O3 surface.
  • Electrochemical analysis to evaluate performance and surface recombination.

Main Results:

  • The Fe-Pi layer and Ar-plasma treatment significantly enhanced the oxygen evolution reaction (OER) activity.
  • The modified photoanode achieved a current density of 2.71 mA cm-2 at 1.23 VRHE and 3.5 mA cm-2 at 1.50 VRHE.
  • Reduced surface recombination was confirmed, indicating improved charge transfer.

Conclusions:

  • The combined strategy of cocatalyst deposition and defect engineering offers a promising route for optimizing hematite-based photoanodes.
  • This approach significantly improves the performance of photoelectrochemical water splitting systems.