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The perovskite La0.8Sr0.2Ga0.83Mg0.17O2.815 (LSGM) fuel cell electrolyte was prepared by a polymeric method using poly(vinyl alcohol) (PVA). The LSGM precursor powder was examined by thermogravimetric and differential thermal analysis (TG/DTA) and Fourier transform infrared (FTIR) spectroscopy. It was found that thermal decomposition of the LSGM precursor powder occurs in a number of different stages, and complete decomposition of the precursor is obtained at 1000 ℃. X-ray diffraction (XRD) showed that calcined powder contains three secondary phases, namely La4Ga2O9, LaSrGa3O7, and LaSrGaO4, even after calcination at 1100 ℃. Furthermore, the fraction of secondary phases decreases with increasing calcination temperature. Single phase perovskite LSGM pellets with a relative density of 97% were obtained after sintering at 1450 ℃ for 10 h. It was therefore shown that the powder prepared by the simple PVA method is fine, highly reactive, and sinterable. The electrical properties of LSGM pellets were characterised by impedance spectroscopy. The conductivity of the LSGM pellets sintered at 1450 ℃ for 10 h was 8.24×10-2 S/cm at 800 ℃.


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Preparation and characterisation of perovskite La0.8Sr0.2Ga0.83Mg0.17O2.815 electrolyte using a poly(vinyl alcohol) polymeric method

Show Author's information Tong-Wei LIa( )Shu-Qiang YANGbShuai LIc( )
School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China
Department of Physics, Luoyang Normal University, Luoyang 471022, China
Department of Energy Materials and Technology, General Research Institute for Nonferrous Metals, Beijing 100088, China

Abstract

The perovskite La0.8Sr0.2Ga0.83Mg0.17O2.815 (LSGM) fuel cell electrolyte was prepared by a polymeric method using poly(vinyl alcohol) (PVA). The LSGM precursor powder was examined by thermogravimetric and differential thermal analysis (TG/DTA) and Fourier transform infrared (FTIR) spectroscopy. It was found that thermal decomposition of the LSGM precursor powder occurs in a number of different stages, and complete decomposition of the precursor is obtained at 1000 ℃. X-ray diffraction (XRD) showed that calcined powder contains three secondary phases, namely La4Ga2O9, LaSrGa3O7, and LaSrGaO4, even after calcination at 1100 ℃. Furthermore, the fraction of secondary phases decreases with increasing calcination temperature. Single phase perovskite LSGM pellets with a relative density of 97% were obtained after sintering at 1450 ℃ for 10 h. It was therefore shown that the powder prepared by the simple PVA method is fine, highly reactive, and sinterable. The electrical properties of LSGM pellets were characterised by impedance spectroscopy. The conductivity of the LSGM pellets sintered at 1450 ℃ for 10 h was 8.24×10-2 S/cm at 800 ℃.

Keywords:

lanthanum gallate, perovskite, polymeric method, ionic conductivity
Received: 18 February 2016 Revised: 08 March 2016 Accepted: 16 March 2016 Published: 01 June 2016 Issue date: June 2021
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Publication history

Received: 18 February 2016
Revised: 08 March 2016
Accepted: 16 March 2016
Published: 01 June 2016
Issue date: June 2021

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© The author(s) 2016

Acknowledgements

The authors would like to thank Prof. Zhicheng Li from the School of Materials Science and Engineering at Central South University (Hunan, China) for the helpful discussions and suggestions on this work. This work is supported by the Key Project for Education Department of Henan Province (Grant No. 16A140008), and the Innovation Team of Henan University of Science and Technology (Grant No. 2015XTD001).

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