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Engineering Directional Charge Carrier Transport Using Ferroelectric Polarization for Enhanced Photoelectrochemical

Qian Xu1, David Berardan2, François Brisset2

  • 1Institut de Chimie Physique, Université Paris-Saclay, UMR 8000 CNRS, Orsay, 91405, France.

Small (Weinheim an Der Bergstrasse, Germany)
|January 11, 2024
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Summary

Ferroelectric polarization in barium titanate/titanium dioxide nanostructures significantly boosts photoelectrochemical water splitting by enhancing charge separation. This approach improves photocurrent and stability, offering a new path for efficient water oxidation.

Keywords:
BaTiO3TiO2charge separationferroelectric polarizationphotoelectrochemistry

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Ferroelectric polarization shows promise for improving interfacial charge separation in photoelectrochemical (PEC) water splitting.
  • Clear evidence distinguishing the effects of ferroelectric polarization from heterojunction formation on electron extraction and PEC performance is needed.

Purpose of the Study:

  • To investigate the influence of ferroelectric polarization in barium titanate/titanium dioxide (BaTiO3/TiO2) core-shell nanostructures on PEC water splitting.
  • To compare the performance of ferroelectric tetragonal (t-BTO) and paraelectric cubic (c-BTO) phases of BaTiO3.

Main Methods:

  • Design and synthesis of core-shell BaTiO3/TiO2 nanostructures with controlled cubic and tetragonal crystalline phases.
  • Fabrication of photoanodes using these nanostructures.
  • Loading of nickel hydroxide (Ni(OH)2) as a cocatalyst on the t-BTO@TiO2 photoanode.

Main Results:

  • The ferroelectric tetragonal phase (t-BTO) demonstrated enhanced directional charge separation compared to the paraelectric cubic phase (c-BTO), increasing photocurrent by up to 1.95 times.
  • Charge separation efficiency was tunable by applied polarization, with the positive polarization yielding the highest efficiency.
  • The Ni(OH)2/TiO2/t-BTO photoanode achieved a photocurrent 6.7 times higher than the reference SiO2@TiO2, showing high performance and stability for PEC water oxidation.

Conclusions:

  • Spontaneous ferroelectric polarization in BaTiO3/TiO2 nanostructures effectively enhances charge separation and boosts PEC water splitting performance.
  • The study provides clear evidence for the beneficial role of ferroelectric polarization, surpassing heterojunction effects alone.
  • This work opens avenues for engineering charge separation and transport for advanced PEC water oxidation applications.