Photocatalytic
reduction of CO2 into available organic
compounds has received remarkable attention. However, photocatalytic
CO2 reduction is limited to meet industrial application
requirements because of the lack of effective photocatalysts. Surface
frustrated Lewis pairs (FLP) are found in bismuth oxybromide (BiOBr),
which are effective catalytic sites to activate and photocatalytically
reduce CO2. Furthermore, the introduction of Ce4+ and oxygen vacancy can optimize both the electronic state and the
FLP property of BiOBr. The combined experimental and theoretical characterizations
reveal that Ce4+ and O2– can form the
frustrated Lewis acid–base pairs, which can catch, excite,
and reduce CO2 into CO at a high yield of 50.9 μL
h–1, being 9.8 times as large as pristine BiOBr.
This work illustrates a rational strategy for both construction of
highly efficient photocatalysts and insights into the photocatalytic
mechanism at the atomic level.
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