研究目的
Investigating the effect of the conduction band (CB) position on plasmonic hydrogen (H2) formation under visible light irradiation over gold (Au) nanoparticles supported on semiconductors, specifically strontium ion (Sr2+)-doped cerium(IV) oxide (CeO2:Sr).
研究成果
The study demonstrated that the position of the conduction band in semiconductors is crucial for plasmonic H2 evolution under visible light irradiation. Au/CeO2:Sr photocatalysts can produce H2 without a Pt cocatalyst when the CB potential is sufficiently negative. The limit for electron injection from Au nanoparticles into the CB of semiconductors lies between ?0.61 V and ?1.49 V vs. NHE.
研究不足
The study is limited by the specific conditions under which the photocatalytic reactions were conducted, including the use of a 2-propanol solution and visible light irradiation. The findings may not be directly applicable to other conditions or materials.
1：Experimental Design and Method Selection:
The study involved the preparation of CeO2:Sr with various Sr2+ mole fractions, loading of Au nanoparticles and Pt cocatalyst on CeO2:Sr, and characterization using X-ray diffraction, UV-vis spectroscopy, and transmission electron microscopy. Photocatalytic H2 evolution under visible light irradiation was measured.
2：Sample Selection and Data Sources:
CeO2:Sr samples with varying Sr2+ mole fractions were prepared by calcining mixtures of CeO2 and SrCO3 at 1273 K for 10 h.
3：List of Experimental Equipment and Materials:
Equipment included a Rigaku Multi Flex for XRD, UV-2600 spectrometer for UV-vis spectroscopy, JEOL JEM-3010 TEM for morphology observation, and a 500 W xenon lamp for photocatalytic reactions.
4：Experimental Procedures and Operational Workflow:
The photocatalytic reaction involved suspending the photocatalyst powder in an aqueous 2-propanol solution, irradiating with visible light, and measuring H2 and acetone production.
5：Data Analysis Methods:
The amount of H2 was measured using gas chromatography, and the amount of acetone was determined with a gas chromatograph equipped with a fused-silica capillary column.
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X-ray diffractometer
Rigaku Multi Flex
Rigaku
Recording XRD patterns of the samples
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UV-vis spectrometer
UV-2600
Shimadzu
Obtaining diffuse reflectance spectra of the samples
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Transmission electron microscope
JEM-3010
JEOL
Observing morphology of the samples
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Xenon lamp
500 W
Ushio
Irradiating the suspension with visible light
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Gas chromatograph
GC-8A
Shimadzu
Measuring the amount of H2 in the gas phase
GC-8A Series Gas Chromatograph
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Gas chromatograph
GC-14A
Shimadzu
Determining the amount of acetone in the liquid phase
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