Synthesis and characterization of a Sr0.95Y0.05TiO3-δ-based hydrogen electrode for reversible solid oxide cells
Type
ArticleKAUST Department
KAUST Solar Center (KSC)Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2015Permanent link to this record
http://hdl.handle.net/10754/563952
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Reversible solid oxide cells (RSOCs) can generate electricity as solid oxide fuel cells (SOFC) facing a shortage of electricity and can also store the electricity as solid oxide electrolysis cells (SOEC) at the time of excessive electricity. The composite Sr0.95Y0.05TiO3-δ-Sm0.2Ce0.8O1.9 (SYT-SDC) as the hydrogen electrode provides a promising alternative for a conventional Ni/YSZ. The possible charge compensation mechanism of SYT is described as Sr0.95Y0.05Ti0.95-2δ 4+Ti2δ+0.05 3+O3-δ. The Ti3+ is approximately 11.73% in the reduced SYT by XRD Rietveld refinement, electron paramagnetic resonance (EPR) and thermogravimetry (TG) analysis. Voltage-current curves and impedance spectra are measured as a function of applied voltages to characterize the cells. The bulk resistance (Ro) and the electrode polarization resistance (Rp) at open circuit voltages (OCV) at 750 °C are 9.06 Ω cm2 and 10.57 Ω cm2, respectively. The Ro values have a small amount of changes with small slopes both in the SOFC (-0.29 Ω cm2 V-1) and SOEC mode (0.5 Ω cm2 V-1), whereas the Rp values decrease all the time with the increasing voltages at both the SOFC (-2.59 Ω cm2 V-1) and SOEC mode (-9.65 Ω cm2 V-1), indicating that the electrical conductivity and electro-catalytic property of the SYT-based hydrogen electrode can be improved under the SOEC mode. This journal isSponsors
The authors wish to thank Japan Society for the Promotion of Science (JSPS) for financial support through a Post-doctoral Fellowship for Foreign Researchers and the financial support from Chinese Natural Science Foundation on contract no. 51102107.Publisher
Royal Society of Chemistry (RSC)Journal
RSC Adv.ae974a485f413a2113503eed53cd6c53
10.1039/c4ra11973h