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Journal of Materials Science
Published in: Journal of Materials Science 10/2019

21-02-2019 | Ceramics

Effect of Bi-doping on the electrocatalytic properties of LaFeO3 powders prepared by sol–gel method

Authors: Wanjun Li, Fujun Yang, Peng Xiong, Yunjie Jia, Jiawei Liu, Xinsui Yan, Xiaoqin Chen

Published in: Journal of Materials Science | Issue 10/2019

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Abstract

In this work, La1−xBixFeO3 powders (0 ≤ x ≤ 0.2) were prepared by sol–gel route. The orthorhombic Pbnm structure of the pure LaFeO3 powder was confirmed by X-ray diffraction. However, there was a changing tendency from the orthorhombic Pbnm structure into the rhombohedral R3c structure with the increase in Bi-doping. The structural and symmetric change of Bi-doped LaFeO3 samples was further verified by the Raman spectra which changed from fundamental 5 modes into 7 modes. The X-ray photoelectron spectra (XPS) revealed that more oxygen vacancies, Fe3+ and Fe4+, existed in Bi-doped LaFeO3 sample. Detailed CV, LSV and EIS analyses had provided conclusive evidence that the oxygen vacancy Fe3+ and Fe4+ played an important contribution to the electrocatalytic activity. The best ORR catalytic effect was observed in La0.85Bi0.15FeO3 catalyst. These results suggest that the Bi-doping is a significative effort to enhance the activities of perovskite electrocatalysts.
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Metadata
Title
Effect of Bi-doping on the electrocatalytic properties of LaFeO3 powders prepared by sol–gel method
Authors
Wanjun Li
Fujun Yang
Peng Xiong
Yunjie Jia
Jiawei Liu
Xinsui Yan
Xiaoqin Chen
Publication date
21-02-2019
Publisher
Springer US
Published in
Journal of Materials Science / Issue 10/2019
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-019-03443-6

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