Ultrasonic-assisted fabrication of Cs2AgBiBr6/Bi2WO6 S-scheme heterojunction for photocatalytic CO2 reduction under visible light

doi:10.1016/S1872-2067(22)64091-9

Abstract

Abstract:

In this manuscript, Cs₂AgBiBr₆/Bi₂WO₆ nanocomposites was fabricated via an ultrasonic-assisted process. The activity of the as-obtained Cs₂AgBiBr₆/Bi₂WO₆ nanocomposites for photocatalytic CO₂ reduction was studied under visible light. The as-obtained Cs₂AgBiBr₆/Bi₂WO₆ nanocomposites show a superior activity for photocatalytic CO₂ reduction to produce CH₄ and CO, with an optimum activity achieved over 0.5 Cs₂AgBiBr₆/Bi₂WO₆. The obvious superior activity observed over Cs₂AgBiBr₆/Bi₂WO₆ nanocomposites as compared with bare Cs₂AgBiBr₆ and bare Bi₂WO₆ as well as a mechanical mixture of Cs₂AgBiBr₆ and Bi₂WO₆ can be owe to the fabrication of an efficient S-scheme heterojunction, which accelerates the separation of the photogenerated charge carriers in Cs₂AgBiBr₆ and Bi₂WO₆ without sacrificing the high redox capability of Cs₂AgBiBr₆ and Bi₂WO₆. This work demonstrates that the coupling of two photocatalytic materials with staggered band alignment to form an S-scheme heterojunction is an effective strategy to develop efficient photocatalytic systems and also highlights the promising role of using lead free perovskites in photocatalysis.

Key words: Cs₂AgBiBr₆, Bi₂WO₆, S-Scheme heterojunction, Photocatalytic CO₂ reduction, Visible light

Jiaqi Wang, Hao Cheng, Dingqiong Wei, Zhaohui Li. Ultrasonic-assisted fabrication of Cs₂AgBiBr₆/Bi₂WO₆ S-scheme heterojunction for photocatalytic CO₂ reduction under visible light[J]. Chinese Journal of Catalysis, 2022, 43(10): 2606-2614.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64091-9

https://www.cjcatal.com/EN/Y2022/V43/I10/2606

Figures/Tables 11

Scheme 1. An illustration of an S-scheme heterojunction system.

Fig. 1. XRD patterns of Cs2AgBiBr6, Bi2WO6 and 0.5 Cs2AgBiBr6/Bi2WO6 nanocomposite.

Fig. 2. TEM (a) and HRTEM (b) images of 0.5 Cs2AgBiBr6/Bi2WO6 nanocomposite.

Fig. 3. XPS spectra of samples. (a) Cs2AgBiBr6 and 0.5 Cs2AgBiBr6/Bi2WO6 in Br 3d region. (b) Cs2AgBiBr6, Bi2WO6, and 0.5 Cs2AgBiBr6/Bi2WO6 in Bi 4f region. Cs2AgBiBr6 and 0.5 Cs2AgBiBr6/Bi2WO6 in Cs 3d (c) and Ag 3d (d) region. (e) Bi2WO6 and 0.5 Cs2AgBiBr6/Bi2WO6 in W 4f region. (f) 0.5 Cs2AgBiBr6/Bi2WO6 in O 1s region.

Fig. 4. UV-vis DRS spectra of Bi2WO6, Cs2AgBiBr6 and 0.5 Cs2AgBiBr6/Bi2WO6 nanocomposite.

Fig. 5. Amount of CO and CH4 evolved in 8 h irradiation over different samples. (a) Cs2AgBiBr6; (b) Bi2WO6; (c) 0.2 Cs2AgBiBr6/Bi2WO6; (d) no catalyst or in dark; (e) a mechanical mixture of Cs2AgBiBr6 and Bi2WO6.

Fig. 6. Amount of CO and CH4 evolved in 8 h irradiation over 0.2 Cs2AgBiBr6/Bi2WO6, 0.5 Cs2AgBiBr6/Bi2WO6, and 1.0 Cs2AgBiBr6/Bi2WO6 nanocomposite.

Fig. 7. Nyquist plots of experimental impedance data for Cs2AgBiBr6, Bi2WO6 and 0.5 Cs2AgBiBr6/Bi2WO6.

Scheme 2. Schematic illustration of photocatalytic CO2 reduction over Cs2AgBiBr6/Bi2WO6 nanocomposite under visible light.

Fig. 8. ESR spectra of DMPO-•OH (a) and DMPO-•O2- (b) adducts over Cs2AgBiBr6, Bi2WO6 and 0.5 Cs2AgBiBr6/Bi2WO6 nanocomposite.

Fig. 9. (a) Cycling of photocatalytic CO2 reduction over 0.5 Cs2AgBiBr6/Bi2WO6 nanocomposite. (b) XRD patterns of the fresh and used 0.5 Cs2AgBiBr6/Bi2WO6 nanocomposite.

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Ultrasonic-assisted fabrication of Cs₂AgBiBr₆/Bi₂WO₆ S-scheme heterojunction for photocatalytic CO₂ reduction under visible light

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