Preparation of SiO2-Coated Cu2O via Hydrolysis Method and Study on Its Oxidation Resistance

doi:10.16552/j.cnki.issn1001-1625.2025.0870

Abstract

Abstract:

This study successfully prepared the SiO₂ coated Cu₂O samples （Cu₂O@SiO₂） with a core-shell structure via a hydrolysis method， using Cu₂O as the core material and tetraethyl orthosilicate （TEOS） as the silicon source. The microstructure and oxidation resistance of the samples were systematically characterized by X-ray diffraction （XRD）， transmission electron microscopy （TEM）， energy dispersive spectroscopy （EDS）， Fourier transform infrared spectroscopy （FT-IR）， and simultaneous DSC-TG analysis. The results indicate that the Cu₂O@SiO₂ prepared under the conditions of a reaction temperature of 45 ℃， NH₃·H₂O concentration of 3.96% （mass fraction）， and TEOS concentration of 3.84% （mass fraction） retained Cu₂O as the primary crystalline phase even after heat treatment at 380 ℃ in an oxidizing atmosphere. Compared to uncoated pure Cu₂O， the initial oxidation temperature of the Cu₂O@SiO₂ increases from 230 ℃ to 385 ℃， representing an improvement of 155 ℃.

Key words: Cu₂O, SiO₂, coating, core-shell structure, oxidation resistance

CLC Number:

TB321

YANG Yue, MIAO Lifeng, JIANG Xinmin, LIAO Lingchen, BAO Zhenhong. Preparation of SiO₂-Coated Cu₂O via Hydrolysis Method and Study on Its Oxidation Resistance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(2): 625-633.

Figures/Tables 11

Fig.1 Preparation process flow diagram of Cu2O@SiO2

Fig.2 TEM images of Cu2O@SiO2 fabricated with different NH3·H2O concentrations

Fig.3 STEM-EDS mapping images of sample A-3

Fig.4 DSC-TG curves of Cu2O@SiO2 fabricated with different NH3·H2O concentrations

Table 1 Key TG data of Cu2O@SiO2 fabricated with different NH3·H2O concentrations

Sample No.	Oxidation onset temperature/℃	Oxidation offset temperature/℃	Oxidative mass gain/%
Cu₂O	230	392	10.84
A-1	327	531	7.42
A-2	334	546	4.80
A-3	352	562	5.66
A-4	343	552	5.10

Fig.5 FT-IR spectrum of sample A-3

Fig.6 XRD patterns of Cu2O@SiO2 fabricated with different TEOS concentrations

Fig.7 DSC-TG curves of Cu2O@SiO2 fabricated with different TEOS concentrations

Table 2 Key TG data of Cu2O@SiO2 fabricated with different TEOS concentrations

Sample No.	Oxidation onset temperature/℃	Oxidation offset temperature/℃	Oxidative mass gain/%
B-1	328	563	7.28
B-2	348	558	5.78
B-3	352	562	5.66
B-4	385	595	5.26
B-5	357	572	3.34

Fig.8 XRD patterns of sample B-4 calcined at different temperatures

Fig.9 XRD patterns of Cu2O calcined at different temperatures

References 23

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Preparation of SiO₂-Coated Cu₂O via Hydrolysis Method and Study on Its Oxidation Resistance

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