Fig. 4: Charge transfer and separation mechanism of CeO2/Bi2S3 Heterojunctions. | Nature Communications

Fig. 4: Charge transfer and separation mechanism of CeO2/Bi2S3 Heterojunctions.

From: Integrating S-scheme photocatalysis with tandem carbonylation: A green and scalable strategy for CO2 valorization

Fig. 4

Calculated electrostatic potentials of a CeO2 (111) and b Bi2S3 (211) slabs. The orange, red, purple, and yellow spheres represent Ce, O, Bi, and S atoms, respectively. c Formation of CeO2/Bi2S3 S-scheme heterojunction and the proposed charge transfer and separation mechanism. CO2 RR and H2O OR denote the CO2 reduction reaction and H2O oxidation reaction, respectively. d EPR spectra of DMPO-•O2– and DMPO-•OH species measured in an aqueous suspension containing DMPO as spin trap and CeO2, Bi2S3 or CB1 as photocatalyst. e The TRPL spectra of CeO2, CB1 and Bi2S3 monitored at an emission wavelength of 465 nm under different conditions.

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