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Gradient tungsten-doped Bi3TiNbO9 ferroelectric photocatalysts with additional built-in electric field for efficient overall water splitting.
- Source :
- Nature Communications; 12/1/2023, Vol. 14 Issue 1, p1-10, 10p
- Publication Year :
- 2023
-
Abstract
- Bi<subscript>3</subscript>TiNbO<subscript>9</subscript>, a layered ferroelectric photocatalyst, exhibits great potential for overall water splitting through efficient intralayer separation of photogenerated carriers motivated by a depolarization field along the in-plane a-axis. However, the poor interlayer transport of carriers along the out-of-plane c-axis, caused by the significant potential barrier between layers, leads to a high probability of carrier recombination and consequently results in low photocatalytic activity. Here, we have developed an efficient photocatalyst consisting of Bi<subscript>3</subscript>TiNbO<subscript>9</subscript> nanosheets with a gradient tungsten (W) doping along the c-axis. This results in the generation of an additional electric field along the c-axis and simultaneously enhances the magnitude of depolarization field within the layers along the a-axis due to strengthened structural distortion. The combination of the built-in field along the c-axis and polarization along the a-axis can effectively facilitate the anisotropic migration of photogenerated electrons and holes to the basal {001} surface and lateral {110} surface of the nanosheets, respectively, enabling desirable spatial separation of carriers. Hence, the W-doped Bi<subscript>3</subscript>TiNbO<subscript>9</subscript> ferroelectric photocatalyst with Rh/Cr<subscript>2</subscript>O<subscript>3</subscript> cocatalyst achieves an efficient and durable overall water splitting feature, thereby providing an effective pathway for designing excellent layered ferroelectric photocatalysts. Solving the interlayer charge transfer issue of Bi<subscript>3</subscript>TiNbO<subscript>9</subscript> is crucial for overcoming its limitation in photocatalytic overall water splitting. Here, the authors introduced gradient doping to promote the separation and transfer of photogenerated charges and enhance the photocatalytic activity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 14
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 173964253
- Full Text :
- https://doi.org/10.1038/s41467-023-43837-4