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Single-Atom Fe Triggers Superb CO2 Photoreduction on a Bismuth-Rich Catalyst

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journal contribution
posted on 12.03.2021, 13:03 by Xiaoli Jin, Yixue Xu, Xin Zhou, Chade Lv, Qunzeng Huang, Gang Chen, Haiquan Xie, Teng Ge, Jian Cao, Jinquan Zhan, Liqun Ye
Insufficient separation of photogenerated electron–hole and feeble CO2 activation remain the main obstacles in the access to high-performance CO2 reduction nowadays. Single-atom active sites engineering could be an efficient method through simultaneously promoting charge separation and CO2 activation. Herein, a model of Bi4O5I2 with single-atom Fe implanting and accompanying Bi decorating on surface is proposed to boost the performance. The single-atom Fe implantation decreases the value of surface work function, allowing the fast transition of photon-generated electrons from the surface of catalyst to CO2 molecule. In situ Fourier transform infrared (FT-IR) spectra, CO2 adsorption measurements, density functional theory (DFT) calculations, and efficient CO2 activation are realized on as-established single-atom catalyst. An exceptional yield of CO (23.77 μmol g–1 h–1) and CH4 production (4.98 μmol g–1 h–1) is acquired over optimized Bi4O5I2–Fe30 with 1.09 wt % of single-atom Fe, superior to Bi4O5I2, and most other reported photocatalysts. The work paves a insight into rational design of photocatalysts toward simultaneously facilitating carrier separation and CO2 activation from the angle of atom single metal.