Citation: Pan Zhiming, Liu Minghui, Niu Pingping, Guo Fangsong, Fu Xianzhi, Wang Xinchen. Photocatalytic CO₂ Reduction Using Ni₂P Nanosheets[J]. Acta Physico-Chimica Sinica, ;2020, 36(1): 190601. doi: 10.3866/PKU.WHXB201906014 shu

Photocatalytic CO₂ Reduction Using Ni₂P Nanosheets

State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China

Corresponding author: Wang Xinchen, xcwang@fzu.edu.cn
Received Date: 4 June 2019
Revised Date: 5 July 2019
Accepted Date: 11 July 2019
Available Online: 19 January 2019
Fund Project: the National Key Technology R&D Program of China 2018YFA0209301The project was supported by the National Key Technology R&D Program of China (2018YFA0209301), the Chang Jiang Scholars Program of China (T2016147), the National Natural Science Foundation of China (21425309, 21761132002, 21861130353) and the 111 Project, China (D16008)the Chang Jiang Scholars Program of China T2016147the National Natural Science Foundation of China 21425309the National Natural Science Foundation of China 21861130353the National Natural Science Foundation of China 21761132002111 Project, China D16008

Artificial photosynthesis is an ideal method for solar-to-chemical energy conversion, wherein solar energy is stored in the form of chemical bonds of solar fuels. In particular, the photocatalytic reduction of CO₂ has attracted considerable attention due to its dual benefits of fossil fuel production and CO₂ pollution reduction. However, CO₂ is a comparatively stable molecule and its photoreduction is thermodynamically and kinetically challenging. Thus, the photocatalytic efficiency of CO₂ reduction is far below the level of industrial applications. Therefore, development of low-cost cocatalysts is crucial for significantly decreasing the activation energy of CO₂ to achieving efficient photocatalytic CO₂ reduction. Herein, we have reported the use of a Ni₂P material that can serve as a robust cocatalyst by cooperating with a photosensitizer for the photoconversion of CO₂. An effective strategy for engineering Ni₂P in an ultrathin layered structure has been proposed to improve the CO₂ adsorption capability and decrease the CO₂ activation energy, resulting in efficient CO₂ reduction. A series of physicochemical characterizations including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and atomic force microscopy (AFM) were used to demonstrate the successful preparation of ultrathin Ni₂P nanosheets. The XRD and XPS results confirm the successful synthesis of Ni₂P from Ni(OH)₂ by a low temperature phosphidation process. According to the TEM images, the prepared Ni₂P nanosheets exhibit a 2D and near-transparent sheet-like structure, suggesting their ultrathin thickness. The AFM images further demonstrated this result and also showed that the height of the Ni₂P nanosheets is ca 1.5 nm. The photoluminescence (PL) spectroscopy results revealed that the Ni₂P material could efficiently promote the separation of the photogenerated electrons and holes in [Ru(bpy)₃]Cl₂·6H₂O. More importantly, the Ni₂P nanosheets could more efficiently promote the charge transfer and charge separation rate of [Ru(bpy)₃]Cl₂·6H₂O compared with the Ni₂P particles. In addition, the electrochemical experiments revealed that the Ni₂P nanosheets, with their high active surface area and charge conductivity, can provide more active centers for CO₂ conversion and accelerate the interfacial reaction dynamics. These results strongly suggest that the Ni₂P nanosheets are a promising material for photocatalytic CO₂ reduction, and can achieve a CO generation rate of 64.8 μmol·h^-1, which is 4.4 times higher than that of the Ni₂P particles. In addition, the XRD and XPS measurements of the used Ni₂P nanosheets after the six cycles of the photocatalytic CO₂ reduction reaction demonstrated their high stability. Overall, this study offers a new function for the 2D transition-metal phosphide catalysts in photocatalytic CO₂ reduction.
- Photocatalysis,
- Nanosheet,
- Ni₂P,
- CO₂ reduction,
- CO
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Photocatalytic CO2 Reduction Using Ni2P Nanosheets

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Photocatalytic CO₂ Reduction Using Ni₂P Nanosheets