Ferroelectric Polarization in BaTiO3 Nanocrystals Controls Photoelectrochemical Water Oxidation and Photocatalytic Hydrogen Evolution

Assavachin, Samutr; Osterloh, Frank E.

doi:10.1021/jacs.3c03762

Title: Ferroelectric Polarization in BaTiO₃ Nanocrystals Controls Photoelectrochemical Water Oxidation and Photocatalytic Hydrogen Evolution

Journal Article · Wed Aug 16 00:00:00 EDT 2023 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.3c03762· OSTI ID:2000438

Assavachin, Samutr ^[1];

^[1]

University of California, Davis, CA (United States)

Ferroelectric (FE) semiconductors such as BaTiO₃ support a remnant polarization after the application of an electric field that can promote the separation of photogenerated charge carriers. Here, we demonstrate FE-enhanced photocatalytic hydrogen evolution and photoelectrochemical water oxidation with barium titanate nanocrystals for the first time. Nanocrystals of the ferroelectric tetragonal structure type were obtained by a hydrothermal synthesis from TiO₂ and barium hydroxide in 63% yield. BaTiO₃ nanocrystal films on tantalum substrates exhibit water oxidation photocurrents of 0.141 mA cm^–2 at 1.23 V RHE under UV light (60 mW cm^–2) illumination. Electric polarization at 52.8 kV cm^–1 normal to the film plane increases the photocurrent by a factor of 2 or decreases it by a factor of 3.5, depending on the field polarity. It also shifts the onset potential by –0.15 or +0.09 V and it modifies the surface photovoltage signal. Lastly, exposure to an electric field increases the H₂ evolution rate of Pt/BaTiO₃ by a factor of ~1.5, and it raises the selectivity of photodeposition of silver onto the (001) facets of the nanocrystal. All FE enhancements can be removed by heating samples above the Curie temperature of BaTiO₃. Furthermore, these findings can be explained by FE dipole-induced changes to the potential drop across the space charge layer of the material. The ability to use the ferroelectric effect to enhance hydrogen evolution and water oxidation is of potential interest for the development of improved solar energy for fuel conversion systems.

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Research Organization:: Univ. of California, Davis, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0015329; CHE 1900136

OSTI ID:: 2000438

Journal Information:: Journal of the American Chemical Society, Vol. 145, Issue 34; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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