Citation: Gaopeng Liu, Lina Li, Bin Wang, Ningjie Shan, Jintao Dong, Mengxia Ji, Wenshuai Zhu, Paul K. Chu, Jiexiang Xia, Huaming Li. Construction of Bi Nanoparticles Loaded BiOCl Nanosheets Ohmic Junction for Photocatalytic CO₂ Reduction[J]. Acta Physico-Chimica Sinica, ;2024, 40(7): 230604. doi: 10.3866/PKU.WHXB202306041 shu

Construction of Bi Nanoparticles Loaded BiOCl Nanosheets Ohmic Junction for Photocatalytic CO₂ Reduction

Gaopeng Liu ¹ ,
Lina Li ¹ ,
Bin Wang ^1,2 ,
Ningjie Shan ¹ ,
Jintao Dong ¹ ,
Mengxia Ji ¹ ,
Wenshuai Zhu ^1,, ,
Paul K. Chu ² ,
Jiexiang Xia ^1,, ,
Huaming Li ^1,,

1.
Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu Province, China;
2.
Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China

Corresponding author: Wenshuai Zhu, Jiexiang Xia, Huaming Li,
Received Date: 26 June 2023
Revised Date: 13 August 2023
Accepted Date: 29 August 2023

Fund Project: The project was supported by the China Postdoctoral Science Foundation (2022M721380, 2020M680065), Jiangsu Funding Program for Excellent Postdoctoral Talent (2023ZB214), National Natural Science Foundation of China (22108106, 22108108), Hong Kong Scholar Program (XJ2021021), City University of Hong Kong Donation Research Grant (DON-RMG, 9229021), City University of Hong Kong Strategic Research Grant (SRG, 7005505), and City University of Hong Kong Donation Grant (9220061).

The continuous increase in the consumption of coal, oil, and natural gas has not only led to the depletion of unsustainable energy sources, but has also caused excessive CO₂ emissions, thus resulting in serious energy crises and climate issues. In such a scenario, it is imperative to explore clean and sustainable energy conversion technologies to address the escalating energy demands and environmental crises. Photocatalytic CO₂ conversion, inspired by natural photosynthesis, utilizes solar energy to convert CO₂ and water into valuable chemicals. After decades of development, artificial photosynthesis has emerged as a green, cost-effective, and sustainable approach to achieving carbon neutrality. However, the challenges of low carrier separation efficiency and insufficient active sites in photocatalysts remain significant hurdles in achieving high-performance CO₂ photoreduction. To address this challenge, the integration of metal nanoparticles with semiconductors to create an Ohmic junction can enhance electron-hole migration by the assist of interfacial electric field (IEF). In this study, an Ohmic junction photocatalyst is constructed by in situ formation of Bi nanoparticles on the surface of BiOCl nanosheets through a solvothermal process. The composition and morphology of the photocatalysts were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) was employed to assess the light absorption performance of the photocatalyst. Transient photocurrent response, electrochemical impedance spectroscopy (EIS), and electron spin resonance (ESR) were utilized to evaluate the efficiency of electron-hole transfer. The distinct work function difference between Bi nanoparticles and BiOCl nanosheets leads to favorable charge transfer characteristics within the formed Ohmic junction, significantly improving the utilization efficiency of photogenerated carriers. Besides, the Bi nanoparticles serve as co-catalysts, enhancing the activation of inert CO₂. As a result, the optimized Bi/BiOCl composite (Bi/BiOCl-2) exhibits enhanced generation rates of CO (34.31 µmol·g^-1) and CH₄ (1.57 µmol g^-1) during 4-h of irradiation, which is 2.55 and 4.76 times compared to pristine BiOCl nanosheets, respectively. Isotope tracer experiments suggest that the obtained carbon-based products are generated through CO₂ photoreduction in the presence of water molecule under irradiation. Moreover, in situ Fourier-transform infrared spectroscopy (in situ FTIR) results indicate the formation of *CHO, *CH₃O, b-CO₃^2-, m-CO₃^2-, HCO^-₃, HCOOH, *COOH, and HCOO^- species during the CO₂ reduction process and a possible mechanism for CO₂ photoreduction into CO and CH₄ is proposed based on these findings. After 25-h of CO₂ photoreduction reaction, the yields of CO and CH₄ continue to increase. Furthermore, the stability of the prepared material is confirmed by XRD pattern, XPS analysis, and TEM image. These outcomes underscore an effective strategy for constructing advanced photocatalysts tailored for high-performance solar-driven CO₂ reduction.
- BiOCl nanosheet,
- Bi nanoparticle,
- CO₂ photoreduction,
- Ohmic junction,
- Charge transfer
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Construction of Bi Nanoparticles Loaded BiOCl Nanosheets Ohmic Junction for Photocatalytic CO2 Reduction

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通讯作者: 陈斌, bchen63@163.com

Construction of Bi Nanoparticles Loaded BiOCl Nanosheets Ohmic Junction for Photocatalytic CO₂ Reduction