Alkali Metal Cations as Charge-Transfer Bridge for Polarization Promoted Solar-to-H2 Conversion
(2023) In Advanced Functional Materials 33(9).- Abstract
Utilization of spontaneous polarization electric field of ferroelectric materials to realize the spatial separation and fast transfer of photogenerated charges has been regarded as a promising strategy to fabricate highly efficient photocatalysts. Herein, a novel heterostructure is constructed by coupling potassium poly(heptazine imide) (K-PHI) with ferroelectric BaxSr1-xTiO3 (BxST) through a facile electrostatic self-assembly strategy. The ionic species of K-PHI can neutralize the polarized charges in BxST to form intimate interfacial contact, substantially boosting the internal electric field. Notably, K+ cations intercalated into K-PHI act as charge-transfer bridge to... (More)
Utilization of spontaneous polarization electric field of ferroelectric materials to realize the spatial separation and fast transfer of photogenerated charges has been regarded as a promising strategy to fabricate highly efficient photocatalysts. Herein, a novel heterostructure is constructed by coupling potassium poly(heptazine imide) (K-PHI) with ferroelectric BaxSr1-xTiO3 (BxST) through a facile electrostatic self-assembly strategy. The ionic species of K-PHI can neutralize the polarized charges in BxST to form intimate interfacial contact, substantially boosting the internal electric field. Notably, K+ cations intercalated into K-PHI act as charge-transfer bridge to promote migration and separation of photogenerated charge carriers. As a result, a significantly improved H2-evolution rate of 1087.4 µmol h−1 g−1 with an apparent quantum yield (AQY) of 8.05% at 420 nm is achieved over 5% K-PHI/B0.8ST, standing among the best polymeric carbon nitride-based photocatalysts reported up to date. Moreover, the extreme stability of the catalysts is evidenced by remaining outstanding catalytic performance even after storage for half a year. This strategy can be extended to other alkali metal (Na+ and Cs+) modified polymeric materials, highlighting the key role of the bridging ions in constructing polarized heterostructure, which sheds light on the design of ferroelectric-assisted photocatalysts.
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- author
- Wang, Meiyang ; Zhang, Zhenzong ; Chi, Zexu ; Lou, Lan lan ; Li, Hui ; Yu, Han LU ; Ma, Tianyi ; Yu, Kai and Wang, Hao LU
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Ba Sr TiO, charge-transfer bridges, ferroelectric polarization, internal electric field
- in
- Advanced Functional Materials
- volume
- 33
- issue
- 9
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:85144260796
- ISSN
- 1616-301X
- DOI
- 10.1002/adfm.202211565
- language
- English
- LU publication?
- yes
- id
- 84b761d5-2d6e-4de2-8a70-2503ea249a9a
- date added to LUP
- 2023-01-23 15:15:55
- date last changed
- 2023-10-26 15:03:51
@article{84b761d5-2d6e-4de2-8a70-2503ea249a9a,
abstract = {{<p>Utilization of spontaneous polarization electric field of ferroelectric materials to realize the spatial separation and fast transfer of photogenerated charges has been regarded as a promising strategy to fabricate highly efficient photocatalysts. Herein, a novel heterostructure is constructed by coupling potassium poly(heptazine imide) (K-PHI) with ferroelectric Ba<sub>x</sub>Sr<sub>1-x</sub>TiO<sub>3</sub> (B<sub>x</sub>ST) through a facile electrostatic self-assembly strategy. The ionic species of K-PHI can neutralize the polarized charges in B<sub>x</sub>ST to form intimate interfacial contact, substantially boosting the internal electric field. Notably, K<sup>+</sup> cations intercalated into K-PHI act as charge-transfer bridge to promote migration and separation of photogenerated charge carriers. As a result, a significantly improved H<sub>2</sub>-evolution rate of 1087.4 µmol h<sup>−1</sup> g<sup>−1</sup> with an apparent quantum yield (AQY) of 8.05% at 420 nm is achieved over 5% K-PHI/B<sub>0.8</sub>ST, standing among the best polymeric carbon nitride-based photocatalysts reported up to date. Moreover, the extreme stability of the catalysts is evidenced by remaining outstanding catalytic performance even after storage for half a year. This strategy can be extended to other alkali metal (Na<sup>+</sup> and Cs<sup>+</sup>) modified polymeric materials, highlighting the key role of the bridging ions in constructing polarized heterostructure, which sheds light on the design of ferroelectric-assisted photocatalysts.</p>}},
author = {{Wang, Meiyang and Zhang, Zhenzong and Chi, Zexu and Lou, Lan lan and Li, Hui and Yu, Han and Ma, Tianyi and Yu, Kai and Wang, Hao}},
issn = {{1616-301X}},
keywords = {{Ba Sr TiO; charge-transfer bridges; ferroelectric polarization; internal electric field}},
language = {{eng}},
number = {{9}},
publisher = {{Wiley-Blackwell}},
series = {{Advanced Functional Materials}},
title = {{Alkali Metal Cations as Charge-Transfer Bridge for Polarization Promoted Solar-to-H<sub>2</sub> Conversion}},
url = {{http://dx.doi.org/10.1002/adfm.202211565}},
doi = {{10.1002/adfm.202211565}},
volume = {{33}},
year = {{2023}},
}