In2O3修饰三维纳米花MoSx构建S型异质结用于高效光催化产氢

doi:10.3866/PKU.WHXB202201037

Abstract

Abstract:

Morphology regulation and the improvement of carrier separation efficiency are important strategies for the preparation of photocatalysts with excellent performance. MoS_x with a three-dimensional (3D) nanoflower morphology formed by nanosheet stacking was prepared by a simple hydrothermal method, and MoS_x/In₂O₃ with good hydrogen evolution activity was obtained by coupling with In₂O₃. The preparation of the three-dimensional nanoflower morphology combined with the construction of an S-scheme heterojunction improves the electron accumulation at the active site for hydrogen evolution reaction. The UV diffuse reflection test showed that the issue of poor light absorption of In₂O₃ was improved. The rapid separation and transfer of electrons were effectively confirmed by characterization methods such as fluorescence spectroscopy and electrochemical tests. The most intuitively manifestation of the performance improvement of the composite material is that the optimal hydrogen evolution rate reached 6704.2 μmol∙g⁻¹∙h⁻¹, which is 1.8 times that of pure MoS_x. Therefore, in this study, a new idea for the development of molybdenum-based sulfides for photocatalytic hydrogen production is provided.

Key words: Photocatalysis, Heterojunction, MoS_x, In₂O₃, Hydrogen production

Hongying Li, Haiming Gong, Zhiliang Jin. In₂O₃-Modified Three-Dimensional Nanoflower MoS_x Form S-scheme Heterojunction for Efficient Hydrogen Production[J]. Acta Phys. -Chim. Sin. 2022, 38(12), 2201037. doi: 10.3866/PKU.WHXB202201037

Figures/Tables 13

References 53

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Samples	Lifetime < τ > (ns)	Pre-exponential factor A%	Average lifetime < τ_av > (ns)	X²
EY	τ₁ = 0.14	100%	0.14	1.32
MoS_x	τ₁ = 0.11	99.61%	0.11	1.32
	τ₂ = 23.4	0.39%
In₂O₃	τ₁ = 0.15	99.72%	0.15	1.37
	τ₂ = 8.16	0.28%
10-MIO	τ₁ = 0.02	99.42%	0.02	1.46
	τ₂ = 3.84	0.58%

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In₂O₃-Modified Three-Dimensional Nanoflower MoS_x Form S-scheme Heterojunction for Efficient Hydrogen Production

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Sample	S_BET/(m²?g^?1)	Prove volume/(cm³?g^?1)	Average pore size/nm
MoS_x	14	0.07	20
In₂O₃	141	0.59	18
10-MIO	25	0.13	19

In2O3-Modified Three-Dimensional Nanoflower MoSx Form S-scheme Heterojunction for Efficient Hydrogen Production

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In₂O₃-Modified Three-Dimensional Nanoflower MoS_x Form S-scheme Heterojunction for Efficient Hydrogen Production