Composite electrodes of Ti-doped SrFeO3-δ and LSGMZ electrolytes as both the anode and cathode in symmetric solid oxide fuel cells

In this work, we attempt to find a suitable mixed composite electrode between perovskite Ti-doped strontium ferrite, SrFe1-xTixO3-δ (x = 0.2, SFTO) and different electrolytes, such as YSZ, GDC, LSGM, and LSGMZ, for use as both electrodes in symmetric solid oxide fuel cells (SSOFCs). The SFTO are fir...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-12, Vol.846, p.156154, Article 156154
Main Authors: Hong, Gihun, Kim, Tae Woo, Kwak, Min Joon, Song, Jeheon, Choi, Yoonseok, Woo, Sang-Kuk, Han, Moon Hee, Cho, Churl Hee, Kim, Sun-Dong
Format: Article
Language:English
Subjects:
Chemical compatibility
Composite electrodes
Composite materials
Electric conductivity
Electrode polarization
Electrodes
Electrolytes
Electrolytic cells
Heat treatment
Ion currents
Maximum power density
Mixing ratio
Operating temperature
Perovskites
Photoelectrons
Redox stability
SFTO
Sol-gel processes
Solid oxide fuel cells
Spectrum analysis
Substitution reactions
Symmetric solid oxide fuel cells
X ray absorption
X ray photoelectron spectroscopy
X ray powder diffraction
Yttria-stabilized zirconia
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Summary:In this work, we attempt to find a suitable mixed composite electrode between perovskite Ti-doped strontium ferrite, SrFe1-xTixO3-δ (x = 0.2, SFTO) and different electrolytes, such as YSZ, GDC, LSGM, and LSGMZ, for use as both electrodes in symmetric solid oxide fuel cells (SSOFCs). The SFTO are first prepared by a sol-gel method and solid-state reaction. The substitution of Fe with Ti4+ in the SFO was confirmed by various analyses, such as powder X-ray diffraction, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy. The electrolytes suitable for use in this system are selected by investigating the chemical compatibility between the SFTO and electrolytes through heat treatment and ionic conductivity measurements of the electrolytes as a function of temperature. According to the powder X-ray patterns, there is no chemical reactivity between SFTO and the electrolytes of GDC, LSGM, and LSGMZ. In contrast, YSZ is not suitable for use as a composite material because of the occurrence of secondary phases. The ionic conductivity test shows that the LSGMZ electrolyte is the best electrolyte at operating temperatures above 700 °C. The mixing ratios of SFTO and LSGMZ electrolytes are varied to determine the optimum performance of the SSOFCs. Compared to the electrode based on SFTO only, the SSOFC consisting of the LSGMZ electrolyte and symmetric SFTO/LSGMZ composite (2:1 wt% ratio) electrodes exhibits a lower electrode polarization resistance value with a higher performance consisting of a maximum power density of 700 mW/cm2 at an operating temperature of 800 °C in a button cell test. •Composite electrodes of SrFeTiO and LSGMZ have been used as both electrodes in SSOFCs.•Composite electrodes with a 2:1 wt% of SrFeTiO/LSGMZ showed the highest electrochemical performance.•The improvement in the electrochemical performance was attributed to the effective expansion of the TPB.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.156154