研究目的
Investigating the enhancement of photocatalytic hydrogen evolution activity through the construction of NiSe/TiO2 heterojunctions.
研究成果
The NiSe/TiO2 heterojunction significantly enhances photocatalytic H2 production activity compared to bare TiO2, with the 10%NiSe/TiO2 heterojunction showing 11 times higher activity. The improved performance is attributed to the effective separation and transfer of photo-excited electron-hole pairs facilitated by the heterojunction and the photo-reduction of partial Ni2t to Ni0.
研究不足
The study focuses on the enhancement of photocatalytic activity through heterojunction construction but does not extensively explore the scalability or long-term stability of the NiSe/TiO2 system under practical conditions.
1：Experimental Design and Method Selection
A facile one-step solvothermal method was used to construct NiSe/TiO2 heterojunctions. The methodology included the synthesis of NiSe and NiSe/TiO2 heterojunctions with different NiSe loading amounts.
2：Sample Selection and Data Sources
Commercial Degussa P25 was used as the source of TiO2. Nickel sulfate hexahydrate and sodium selenite were used as precursors for NiSe synthesis.
3：List of Experimental Equipment and Materials
X-ray Diffraction (XRD) patterns were determined using a Bruker D8 Advance X-ray diffractometer. Transmission electron microscope (TEM), high-resolution transmission electron microscope (HRTEM), and energy dispersive X-ray spectrum (EDX) were recorded on a FEI Tecnai G2 F20 instrument. X-ray photoelectron spectroscopy (XPS) spectra were acquired using an ESCALAB 250 photoelectron spectrometer.
4：Experimental Procedures and Operational Workflow
NiSe was prepared via a solvothermal method. NiSe/TiO2 heterojunctions were synthesized by adding TiO2 powder to the solvothermal reaction. Photocatalytic hydrogen evolution tests were performed under UV-vis light irradiation.
5：Data Analysis Methods
The amount of evolved H2 was analyzed by an online gas chromatograph. Apparent quantum efficiency (AQE) was measured under irradiation of monochromatic light.
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