AI Article Synopsis
- Ferroelectric semiconductors like β-CuGaO show potential in photocatalysis because their spontaneous polarization helps reduce the recombination of useful charges generated during reactions.
- This study explores how polarization affects the oxygen evolution reaction (OER) by comparing polarized and unpolarized surfaces, finding that the [011]-polarized configuration has the lowest energy barrier for OER, making it highly favorable for water interactions.
- The research indicates that higher polarization intensities enhance catalytic performance through their impact on the electronic properties, particularly the 3d orbitals of copper, which could help in designing better photocatalytic materials.
Article Abstract
Ferroelectric semiconductors hold great promise in the field of photocatalysis due to their spontaneous polarization that can suppress the recombination of photogenerated charges, but the mechanism of the effect of ferroelectric polarization and the intensity of polarization on surface catalytic reactions have never been approached. Here, we have comparatively investigated the oxygen evolution reaction (OER) catalytic process on surfaces in polarized and unpolarized orientations of the intrinsic ferroelectric semiconductor β-CuGaO by first-principles calculations. Furthermore, semiquantitative effects of different polarization intensities on the OER on the surfaces are subsequently carried out. First, it is confirmed that the [011]-polarized surface with fully exposed Cu-O atoms is the easiest surface to form and the most attractive for water molecules, exhibiting the lowest OER free energy barrier of 1.71 eV. Second, the calculated results indicate that [011] surfaces with higher polarization intensity are capable of enhancing the photogenerated hole potential () due to the accumulation of microscopic polarization in the polar unit of the bulk phase within the [011] slab. The intrinsic mechanism behind the enhancement of the OER by ferroelectric polarization is attributed to the modulation effect of polarization intensity on the 3d orbit of Cu. This work elucidates the effects of ferroelectric polarization orientations as well as polarization intensity for the water OER, and provides theoretical guidance for the intrinsic ferroelectric polarization to promote surface OER.
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| http://dx.doi.org/10.1021/acs.inorgchem.4c02073 | DOI Listing |
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