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Issue 38, 2014
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BiFeO3/YSZ bilayer electrolyte for low temperature solid oxide fuel cell

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Abstract

We have demonstrated BiFeO3 (BFO) as a potential bilayer electrolyte for 650 °C low temperature solid oxide fuel cell application. The stoichiometric perovskite BFO is synthesized by wet chemistry, calcined at 500 °C and sintered at 850 °C. The crystalline structure is confirmed by X-ray diffraction spectroscopy, the atomic ratios (Bi : Fe) of 1.02 and 1.00 are determined by X-ray energy dispersive spectroscopy and inductively coupled plasma-mass spectroscopy, respectively. The X-ray photoelectron spectroscopy analysis indicates the presence of oxygen vacancies which can partially reduce Fe3+ and result in relatively high dielectric constant (6252 at 100 kHz) and ionic conductivity (>10−2 S cm−1 at 650 °C). The BFO is coated with an yttria-stabilized zirconia (YSZ) protective layer to avoid hydrogen reduction of BFO. This bilayer electrolyte exhibits a 1.6 times increase in maximum power density as compared with pure YSZ when a Ni–YSZ anode and lanthanum strontium cobalt ferrite (LSCF) cathode are used in the fuel cell at 650 °C.

Graphical abstract: BiFeO3/YSZ bilayer electrolyte for low temperature solid oxide fuel cell

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Publication details

The article was received on 03 Mar 2014, accepted on 17 Apr 2014 and first published on 01 May 2014


Article type: Paper
DOI: 10.1039/C4RA01862A
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2014,4, 19925-19931
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    BiFeO3/YSZ bilayer electrolyte for low temperature solid oxide fuel cell

    Y. Tu, C. Chang, M. Wu, J. Shyue and W. Su, RSC Adv., 2014, 4, 19925
    DOI: 10.1039/C4RA01862A

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