Citation: Cao Dan, An Hua, Yan Xiaoqing, Zhao Yuxin, Yang Guidong, Mei Hui. Fabrication of Z-Scheme Heterojunction of SiC/Pt/Cds Nanorod for Efficient Photocatalytic H₂ Evolution[J]. Acta Physico-Chimica Sinica, ;2020, 36(3): 190105. doi: 10.3866/PKU.WHXB201901051 shu

Fabrication of Z-Scheme Heterojunction of SiC/Pt/Cds Nanorod for Efficient Photocatalytic H₂ Evolution

Cao Dan ¹ ,
An Hua ¹ ,
Yan Xiaoqing ¹ ,
Zhao Yuxin ¹ ,
Yang Guidong ^1,, ,
Mei Hui ^2,,

1.
XJTU-Oxford International Joint Laboratory for Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, P. R. China
2.
Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China

Corresponding author: Yang Guidong, guidongyang@xjtu.edu.cn Mei Hui, meihui@nwpu.edu.cn
Received Date: 22 January 2019
Revised Date: 9 March 2019
Accepted Date: 28 March 2019
Available Online: 1 March 2019
Fund Project: Fundamental Research Funds for the Central Universities, China cxtd2017004The project was supported by the National Natural Science Foundation of China (U1862105), Natural Science Basic Research Plan in Shaanxi Province of China (2017JZ001, 2018KJXX-008), Key Research and Development Program of Shaanxi Province, China (2018ZDCXL-SF-02-04), Fundamental Research Funds for the Central Universities, China (cxtd2017004), and K. C. Wong Education Foundation and Hong Kong, Chinathe National Natural Science Foundation of China U1862105Natural Science Basic Research Plan in Shaanxi Province of China 2018KJXX-008Key Research and Development Program of Shaanxi Province, China 2018ZDCXL-SF-02-04Natural Science Basic Research Plan in Shaanxi Province of China 2017JZ001

In this study, a novel silicon carbide/platinum/cadmium sulfide (SiC/Pt/CdS) Z-scheme heterojunction nanorod is constructed using a simple chemical reduction-assisted hydrothermal method, in which Pt nanoparticles are anchored at the interface of SiC nanorods and CdS nanoparticles to induce an electron-hole pair transfer along the Z-scheme transport path. Multiple characterization techniques are used to analyze the structure, morphology, and properties of these materials. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results show that the SiC/Pt/CdS materials with good crystal structure are successfully synthesized. Transmission electron microscopy reveals that Pt nanoparticles grow between the interfaces of SiC nanorods and CdS nanoparticles. UV-Vis diffuse reflectance spectroscopy shows that the as-prepared Z-scheme heterojunction samples have a wider light absorption range in comparison with pristine CdS materials. Photoluminescence spectroscopy and the transient photocurrent response further demonstrate that the SiC/Pt/CdS nanorod sample with an optimal molar ratio possesses the highest electron-hole pair separation efficiency. The loading amount of CdS on the surface of SiC/Pt nanorods is effectively adjusted by controlling the molar ratio of SiC and CdS to achieve the optimal performance of the SiC/Pt/CdS nanorod photocatalysts. The optimal H₂ evolution capacity is achieved at SiC : CdS = 5 : 1 (molar ratio) and the maximum H₂ evolution rate reaches a high value of 122.3 µmol·h⁻¹. In addition, scanning electron microscopy, XRD, and XPS analyses show that the morphology and crystal structure of the SiC/Pt/CdS photocatalyst remain unchanged after three cycles of activity testing, indicating that the SiC/Pt/CdS nanocomposite has a stable structure for H₂ evolution under visible light. To prove the Z-scheme transfer mechanism of electron-hole pairs, selective photo-deposition technology is used to simultaneously carry out the photo-reduction deposition of Au nanoparticles and photo-oxidation deposition of Mn₃O₄ nanoparticles in the photoreaction. The experimental results indicate that during photocatalysis, the electrons in the conduction band of CdS participate mainly in the reduction reaction, and the holes in the valence band of SiC are more likely to undergo the oxidation reaction. The electrons in the conduction band of SiC combine with the holes in the valence band of CdS to form a Z-scheme transport path. Therefore, a possible Z-scheme charge migration path in SiC/Pt/CdS nanorods during photocatalytic H₂ production is proposed to explain the enhancement in the activity. This study provides a new strategy for synthesizing a Z-scheme photocatalytic system based on SiC nanorods. Based on the characterization results, it is determined that SiC/Pt/CdS nanocomposites are highly efficient, inexpensive, easy to prepare, and are stable structures for H₂ evolution under visible light with outstanding commercial application prospects.
- SiC,
- Nanorod,
- SiC/Pt/CdS,
- Photocatalyst,
- Z-scheme heterojunction
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沈阳化工大学材料科学与工程学院沈阳 110142

Fabrication of Z-Scheme Heterojunction of SiC/Pt/Cds Nanorod for Efficient Photocatalytic H2 Evolution

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通讯作者: 陈斌, bchen63@163.com

Fabrication of Z-Scheme Heterojunction of SiC/Pt/Cds Nanorod for Efficient Photocatalytic H₂ Evolution