Synthesis, Characterization, and Electrochemical Properties of La-Doped α-Fe2O3 Nanoparticles

Hewei Wang; Peiyang Shi; Junxiang Ning

doi:10.3390/nano12193346

Synthesis, Characterization, and Electrochemical Properties of La-Doped α-Fe₂O₃ Nanoparticles

Nanomaterials (Basel). 2022 Sep 26;12(19):3346. doi: 10.3390/nano12193346.

Authors

Hewei Wang¹, Peiyang Shi¹, Junxiang Ning¹

Affiliation

¹ Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang 110819, China.

Abstract

La-doped α-Fe₂O₃ nanoparticles were synthesized by a hydrothermal method. The effects of pH value on the morphology, structure, and electrochemical stability of the La-doped α-Fe₂O₃ nanoparticles were investigated by X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectrum, and electrochemical methods. The results show that the La-doped α-Fe₂O₃ nanoparticles exhibit a uniform spherical morphology at pH = 6, and are agglomerated with a poor dispersion at pH = 4 and 8. The iron oxide lattice is distorted by the La-doping, which increases the Fe-O bond strength. The decreased Fe-O bond length and the increased Fe-O bond energy at pH = 6 improve the electrochemical stability of α-Fe₂O₃. The waterborne coating modified with La-doped α-Fe₂O₃ nanoparticles exhibits a steady corrosion resistance.

Keywords: La-doped α-Fe2O3 nanoparticle; corrosion resistance; electrochemical stability; pH value.

Grants and funding

This work was supported financially by the National Natural Science Foundation of China (51874082), and the National Key R&D Program of China (2017YFC0805100).