Citation: Guimin ZHANG, Wenjuan MA, Wenqiang DING, Zhengyi FU. Synthesis and catalytic properties of hollow AgPd bimetallic nanospheres[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(5): 963-971. doi: 10.11862/CJIC.20230293 shu

Synthesis and catalytic properties of hollow AgPd bimetallic nanospheres

1.
School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China
2.
State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Corresponding author: Zhengyi FU, zyfu@whut.edu.cn
Received Date: 4 August 2023
Revised Date: 9 March 2024

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The paper reports the synthesis of AgPd bimetallic hollow nanospheres at 70℃ by galvanic replacement reaction (GRR) coupled with a co-reduction method using Ag nanoparticles as sacrificial templates, H₂PdCl₄ as precursor, ascorbic acid as reductant, and polyvinyl pyrrolidone as capping agent. To characterize the structures, compositions, and morphologies of the products prepared with different H₂PdCl₄ solution volumes, UV-Vis spectra, powder X-ray diffraction, and transmission electron microscope coupled with an energy dispersive spectrometer were used. The results indicate the interior caves of nanospheres gradually become big and densities decrease with the increase of volume of the H₂PdCl₄ solution. Simultaneously, the sizes of nanoparticles increase. When the volume of the H₂PdCl₄ solution was increased to 120 μL, we synthesized the uniform hollow AgPd bimetallic nanospheres with outer sizes of about 25 nm and wall thicknesses of 2-3 nm. The catalytic activities of Ag, Pd, and AgPd bimetals were evaluated using the catalytic hydrogenation of 4-nitrophenol by an excess of NaBH₄ at room temperature. The AgPd bimetals showed superior catalytic activities than pure Ag and Pd due to electron transfer from Ag to Pd. The reaction rate constant of AgPd-120 nano hollow sphere (120 μL of H₂PdCl₄ solution) as a catalyst was the highest, which was 24.0 times that of pure Ag nanospheres of the same size and 14.7 times that of pure Pd nanocubes
- AgPd bimetal,
- hollow nanosphere,
- galvanic replacement,
- 4-nitrophenol,
- catalytic reduction
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