Synthesis of Zn0.4(CuGa)0.3Ga2S4/CdS Photocatalyst for CO2 Reduction

doi:10.15541/jim20210480

Abstract

Abstract:

Conversion of CO₂ into fuels by photocatalysis is promising in solving the energy crisis and the greenhouse effect. Among various photocatalytic materials, Zn_1-2_x(CuGa)_xGa₂S₄ materials possess visible light response and high conduction band potential, which are ideal CO₂ reduction materials from thermodynamics aspect. However, their photocatalytic CO₂ reduction activity is still low which is urgent to improve its activity in terms of kinetics. In this study, Zn_0.4(CuGa)_0.3Ga₂S₄ was synthesized and composited with CdS nanoparticles with different proportions to form Zn_0.4(CuGa)_0.3Ga₂S₄/CdS heterojunction photocatalysts. A series of characterizations suggest that CdS is uniformly grown on surface of Zn_0.4(CuGa)_0.3Ga₂S₄ microcrystals to form a Z-scheme type all-solid heterojunction composite materials. Such a structure effectively suppresses the recombination of electron-hole pairs and improve the photocatalytic performance. In the solution CO₂ reduction system, the as-prepared Zn_0.4(CuGa)_0.3Ga₂S₄/CdS can effectively reduce CO₂ into CO under visible light irradiation. The optimal molar ratio of Zn_0.4(CuGa)_0.3Ga₂S₄ and CdS in composite materials is 2 : 1, whose photocatalytic performance is 1.7 times of that of Zn_0.4(CuGa)_0.3Ga₂S₄/ CdS and 1.6 times of that of CdS. This work constructs all solid Z-scheme type Zn_0.4(CuGa)_0.3Ga₂S₄/CdS heterojunction materials with enhanced photocatalytic activity for CO₂ reduction, which is promising for designing novel photocatalysts in field of artificial photosynthesis.

Key words: photocatalysis, Z-scheme heterojunction, carbon dioxide reduction, sulfide

CLC Number:

TQ174

LIU Peng, WU Shimiao, WU Yunfeng, ZHANG Ning. Synthesis of Zn_0.4(CuGa)_0.3Ga₂S₄/CdS Photocatalyst for CO₂ Reduction[J]. Journal of Inorganic Materials, 2022, 37(1): 15-21.

Figures/Tables 9

Fig. 1 XRD patterns of as-prepared products

Fig. 2 (a,b) SEM images, (c,d) TEM images, (e) HRTEM image of Zn0.4(CuGa)0.3Ga2S4/CdS-2 : 1

Fig. 3 EDS elemental line scanning analyses of Zn0.4(CuGa)0.3Ga2S4/CdS-2 : 1

Fig. 4 (a) Cu2p, (b) C3d, (c) S2p, (d) Ga3d XPS spectra of Zn0.4(CuGa)0.3Ga2S4/CdS-2 : 1, Zn0.4(CuGa)0.3Ga2S4 and CdS

Fig. 5 UV-Vis adsorption spectra (a) and band gap energy calculation diagram (b) of samples

Fig. 6 VB-XPS spectra of Zn0.4(CuGa)0.3Ga2S4 and CdS

Fig. 7 Scheme of relatively energy band position for Zn0.4(CuGa)0.3Ga2S4 and CdS

Fig. 8 TRPL spectra of samples Zn0.4(CuGa)0.3Ga2S4/CdS-2 : 1, Zn0.4(CuGa)0.3Ga2S4 and CdS Colorful figures are available on website

Fig. 9 (a) CO evolution vs. irradiation time, (b) CO evolution rate, (c) H2 evolution vs. irradiation time, and (d) H2 evolution rate over Zn0.4(CuGa)0.3Ga2S4/CdS-4 : 1, Zn0.4(CuGa)0.3Ga2S4/CdS-2 : 1, Zn0.4(CuGa)0.3Ga2S4/CdS-1 : 1, Zn0.4(CuGa)0.3Ga2S4, and CdS Colorful figures are available on website

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Synthesis of Zn_0.4(CuGa)_0.3Ga₂S₄/CdS Photocatalyst for CO₂ Reduction

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