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Synthesis and characterization of terbium doped barium cerates as a proton conducting SOFC electrolyte
- Source :
-
International Journal of Hydrogen Energy . Oct2011, Vol. 36 Issue 20, p13067-13072. 6p. - Publication Year :
- 2011
-
Abstract
- Abstract: A novel proton conductor, BaCe0.95Tb0.05O3 −a (BCTb) perovskite was synthesized via the EDTA-citrate acid complexing method, followed by high temperature calcination. The properties of the powders were characterized by thermo gravimetric-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), Scanning electron microscopy (SEM) and the conductivity measurement using the 4-probe method. In order to obtain the pure perovskite structure, the calcination temperature was elevated at 1000 °C or greater. The electrical conductivities of the BCTb perovskite mainly result from protons and are 6.51 × 10−3−2.0 × 10−2 S cm−1 in the temperature range of 600–850 °C with the activation energy of 41.95 kJ mol−1. A Ni-BCTb∣BCTb∣LSCF(La0.6Sr0.4Co0.2Fe0.8O3-α)-BCTb fuel cell was subsequently fabricated via a co-pressing/co-sintering method, followed by slurry-coating of the cathode. With 50 mL min−1 pure hydrogen as fuel and the ambient air as oxidant, the maximum output of the fuel cell has reached to 753 mW cm−2 at 700 °C. The results demonstrate that BCTb perovskite may be a promising electrolyte for the proton-conducting solid oxide fuel cells (PC-SOFCs) after its chemical stability is improved significantly. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 36
- Issue :
- 20
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 65495632
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2011.07.075