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Substrate-Electrode Interface Engineering by an Electron-Transport Layer in Hematite Photoanode.

Chunmei Ding1, Zhiliang Wang1, Jingying Shi1

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Introducing an electron-transport layer (ETL) significantly boosts photoelectrochemical water oxidation efficiency. This metal oxide layer accelerates electron extraction, improving charge separation and suppressing recombination for higher performance.

Keywords:
Fe2O3LiWO3electron-transport layerhematiteinterface

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Photocatalysis

Background:

  • Photoelectrochemical (PEC) water oxidation efficiency is often limited by interfacial charge transfer.
  • Efficient charge separation and transport are crucial for optimizing PEC devices.

Purpose of the Study:

  • To enhance photoelectrochemical water oxidation efficiency by introducing a metal oxide electron-transport layer (ETL) at the substrate-electrode interface.
  • To investigate the role of Li-doped Fe2O3 (Li:Fe2O3) and WO3 as ETLs in improving charge dynamics.

Main Methods:

  • Fabrication of hematite photoanodes on Li(+)- or WO3-modified substrates.
  • Characterization of the electronic properties and charge transfer dynamics of the modified photoanodes.
  • Measurement of photocurrent and evaluation of water oxidation efficiency.

Main Results:

  • Hematite photoanodes with Li:Fe2O3 or WO3 ETLs exhibited higher photocurrents compared to unmodified ones.
  • The ETLs facilitated faster electron extraction, improving charge separation and injection efficiencies.
  • Electron lifetime was prolonged by 3 times, and the surface charge transfer to recombination rate ratio increased by 5 times (Li:Fe2O3) and 125 times (WO3).

Conclusions:

  • The introduction of a metal oxide ETL effectively accelerates electron extraction from the photoanode to the substrate.
  • This expedited electron transfer suppresses recombination at both the back contact and surface interfaces.
  • The enhanced charge dynamics lead to significantly improved photoelectrochemical water oxidation efficiency.