- Title
- Coupling ferroelectric polarization and anisotropic charge migration for enhanced CO₂ photoreduction
- Creator
- Yu, Hongjian; Huang, Hongwei; Reshak, Ali H.; Auluck, Sushil; Liu, Lizhen; Ma, Tianyi; Zhang, Yihe
- Relation
- ARC.DE150101306 http://purl.org/au-research/grants/arc/DE150101306
- Relation
- Applied Catalysis B: Environmental Vol. 284, Issue 5 May 2021, no. 119709
- Publisher Link
- http://dx.doi.org/10.1016/j.apcatb.2020.119709
- Publisher
- Elsevier BV
- Resource Type
- journal article
- Date
- 2021
- Description
- CO2 photoreduction into solar fuels is promising for generating renewable energy. Herein, SrBi2Nb2O9 nanosheets are prepared as high-performance photocatalysts for CO2 reduction, highlighting superiority of ferroelectric polarization and anisotropic charge migration. Ferroelectric polarization within SrBi2Nb2O9 nanosheets provides an in-built electric field, which greatly facilitates the bulk charge separation. Also, the photogenerated electrons and holes migrate separately to the NbO6 octahedral layers and within the ab-plane in the Bi2O2 layers, achieving efficient anisotropic charge migration. Without co-catalyst or sacrificial agent, SrBi2Nb2O9 nanosheets show outstanding CO2 reduction activity in producing CH4. The ferroelectric polarization is further enhanced by electric poling and annealing post-treatments. The electrically poled SrBi2Nb2O9 shows a high CH4 evolution rate of 25.91 μmol g−1 h−1 with an AQE of 1.96 % at 365 nm, exceeding most of state-of-the-art photocatalysts reported to date. This work paves an avenue for development of highly efficient photocatalysts and beyond by tuning the ferroelectricity and electronic structure.
- Subject
- CO₂ photoreduction; ferroelectric; in-built electric field; charge separation; SDG 7; SDG 13; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1463835
- Identifier
- uon:46850
- Identifier
- ISSN:0926-3373
- Language
- eng
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Goal 13: Climate Change
Goal 7: Ensure access to affordable, reliable, sustainable and modern energy
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