Synergy of ferroelectric polarization and oxygen vacancy to promote CO2 photoreduction

Hongjian Yu, Fang Chen, Xiaowei Li, Hongwei Huang (), Qiuyu Zhang, Shaoqiang Su, Keyang Wang, Enyang Mao, Bastian Mei, Guido Mul, Tianyi Ma () and Yihe Zhang ()
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Hongjian Yu: China University of Geosciences
Fang Chen: China University of Geosciences
Xiaowei Li: China University of Geosciences
Hongwei Huang: China University of Geosciences
Qiuyu Zhang: China University of Geosciences
Shaoqiang Su: University of Twente
Keyang Wang: Lanzhou University
Enyang Mao: China University of Geosciences
Bastian Mei: University of Twente
Guido Mul: University of Twente
Tianyi Ma: Swinburne University of Technology, Hawthorn
Yihe Zhang: China University of Geosciences

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Solar-light driven CO2 reduction into value-added chemicals and fuels emerges as a significant approach for CO2 conversion. However, inefficient electron-hole separation and the complex multi-electrons transfer processes hamper the efficiency of CO2 photoreduction. Herein, we prepare ferroelectric Bi3TiNbO9 nanosheets and employ corona poling to strengthen their ferroelectric polarization to facilitate the bulk charge separation within Bi3TiNbO9 nanosheets. Furthermore, surface oxygen vacancies are introduced to extend the photo-absorption of the synthesized materials and also to promote the adsorption and activation of CO2 molecules on the catalysts’ surface. More importantly, the oxygen vacancies exert a pinning effect on ferroelectric domains that enables Bi3TiNbO9 nanosheets to maintain superb ferroelectric polarization, tackling above-mentioned key challenges in photocatalytic CO2 reduction. This work highlights the importance of ferroelectric properties and controlled surface defect engineering, and emphasizes the key roles of tuning bulk and surface properties in enhancing the CO2 photoreduction performance.

Date: 2021
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DOI: 10.1038/s41467-021-24882-3

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