Details

Autor(en) / Beteiligte

• Ling, Yihan
• Chen, Luyang
• Lin, Bin
• Yu, Weili
• Isimjan, Tayirjan T
• Zhao, Ling
• Liu, Xingqin

Titel

Synthesis and characterization of a Sr0.95Y0.05TiO3−δ-based hydrogen electrode for reversible solid oxide cells

Erscheinungsjahr

2015-01

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 Sr 0.95 Y 0.05 TiO 3− δ -Sm 0.2 Ce 0.8 O 1.9 (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 Sr 0.95 Y 0.05 Ti 0.95−2 δ 4+ Ti 2 δ +0.05 3+ O 3− δ . The Ti 3+ 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 ( R o ) and the electrode polarization resistance ( R p ) at open circuit voltages (OCV) at 750 °C are 9.06 Ω cm 2 and 10.57 Ω cm 2 , respectively. The R o values have a small amount of changes with small slopes both in the SOFC (−0.29 Ω cm 2 V −1 ) and SOEC mode (0.5 Ω cm 2 V −1 ), whereas the R p values decrease all the time with the increasing voltages at both the SOFC (−2.59 Ω cm 2 V −1 ) and SOEC mode (−9.65 Ω cm 2 V −1 ), indicating that the electrical conductivity and electro-catalytic property of the SYT-based hydrogen electrode can be improved under the SOEC mode. 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.