研究目的
Investigating the dual function of graphene oxide in the assisted exfoliation of black phosphorus and as an electron shuttle in promoting visible and near-infrared photocatalytic H2 evolution.
研究成果
The study successfully constructed a new noble-metal-free photocatalyst of MoS2-BP/GO with broad wavelength absorption for photocatalytic reduction of water to H2. GO showed dual functions in both synthetic process and photocatalytic H2 production, acting as a surfactant and catalyst carrier, and as an electron shuttle for promoting efficient charge separation/transfer.
研究不足
The study mentions the degradation of BP during long time light irradiation in the aqueous solution and the decrease of the concentration of sacrificial electron donor after long time photoreaction as factors affecting the durability of MoS2-BP/GO.
1：Experimental Design and Method Selection
The study involved the construction of a noble-metal-free ternary photocatalyst MoS2-BP/GO for splitting water to H2, utilizing GO for assisted exfoliation of BP and as an electron shuttle.
2：Sample Selection and Data Sources
Bulk BP crystals, single layer of GO, and bulk MoS2 crystals were used. The samples were prepared through liquid-phase exfoliation and hybridization processes.
3：List of Experimental Equipment and Materials
N-methyl-2-pyrrolidone (NMP), methanol, bulk BP crystals (XF161), single layer of GO (XF002-1), bulk MoS2 crystals (XF184-1), tip sonicator (Misonix XL-2000), Xenon lamp (Asahi Spectra, HAL-320W), gas chromatograph (Shimadzu GC-8A).
4：Experimental Procedures and Operational Workflow
BP/GO was obtained through NMP solvent exfoliation. MoS2-BP/GO was prepared by adding MoS2 NMP dispersion into BP/GO NMP dispersion. Photocatalytic H2 production was carried out under visible-NIR light irradiation.
5：Data Analysis Methods
The gases produced were analyzed with a gas chromatograph. Transient absorption spectra were measured by the pump and probe method using a regeneratively amplified titanium sapphire laser.
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Xenon lamp
HAL-320W
Asahi Spectra
Light source for photocatalytic H2 production.
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gas chromatograph
GC-8A
Shimadzu
Analysis of gases produced during photocatalytic H2 production.
GC-8A Series Gas Chromatograph
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N-methyl-2-pyrrolidone
NMP
Sigma-Aldrich
Solvent for exfoliation of BP and GO.
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bulk BP crystals
XF161
Nanjing XFNANO Materials Tech Co., Ltd.
Source material for BP nanosheets.
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single layer of GO
XF002-1
Nanjing XFNANO Materials Tech Co., Ltd.
Assisted exfoliation of BP and as an electron shuttle.
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bulk MoS2 crystals
XF184-1
Nanjing XFNANO Materials Tech Co., Ltd.
Co-catalyst for photocatalytic H2 production.
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tip sonicator
XL-2000
Misonix
Used for exfoliation of BP and GO.
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