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Ce-doped α-Fe2O3 nanoparticles prepared by hydrothermal method used in corrosion-resistant field: effects of pH on the structure, morphology and chemical stability

Authors
  • Ning, Junxiang1
  • Shi, Peiyang1
  • Jiang, Maofa1
  • Liu, Chengjun1
  • Jia, Zhongshuai2
  • 1 Northeastern University, Wenhua Road, Heping District, Shenyang, 110819, China , Shenyang (China)
  • 2 Baogang Group, Inner Mongolia Autonomous Region, Baotou, 014030, China , Baotou (China)
Type
Published Article
Journal
Applied Physics A
Publisher
Springer-Verlag
Publication Date
Jul 17, 2021
Volume
127
Issue
8
Identifiers
DOI: 10.1007/s00339-021-04766-5
Source
Springer Nature
Keywords
Disciplines
  • Article
License
Yellow

Abstract

Ce-doped α-Fe2O3 nanoparticles were successfully synthesized by hydrothermal method at different pH. The relationship between the pH of the solution and the morphology, structure and electrochemical stability of the prepared Ce-doped α-Fe2O3 nanoparticles was investigated by X-ray diffraction, transmission electron microscopy, scanning electron microscope, Fourier transform infrared, X-ray photoelectron spectroscopy, electrochemical methods and saltwater immersion experiment. The results showed that the Ce-doped α-Fe2O3 nanoparticles prepared at pH = 4 and pH = 6 had surface defects structure, and the Ce-doped α-Fe2O3 nanoparticles prepared at pH = 8 had adhesion structures, which were CeO2 nanoparticles adhered to the α-Fe2O3 nanoparticles’ surface. The fact that Ce ions could be readily doped into the α-Fe2O3 lattice, causing lattice distortion and increasing the binding energy of Fe3+ in the lattice, thereby enhancing the stability of Fe–O bonds correspondingly. At the same time, the surface defect structure is produced, which has the effect of promoting the compactness of the coating. The surface defects structure of α-Fe2O3 has stronger electrochemical stability than the adhesion structure of α-Fe2O3 and Bayer α-Fe2O3. It was found that waterborne acrylic coatings prepared from of α-Fe2O3 with surface defects structure had a stronger hindering effect on the diffusion of charged ions.

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