Enhancement of Electrochemical Properties, Impedance and Resistances of Micro-tubular IT-SOFCs with Novel Asymmetric Structure Based On BaZr0.1Ce0.7Y0.1Yb0.1O3−δ Proton Conducting Electrolyte

Release time:2024-08-09  Hits:

• Affiliation of Author(s):理学院
• Journal:Fuel Cells
• Key Words:Phase-inversion, Fuel Cell, Electrolyte, Micro-tubular Cells, Concentration Polarization, AC Impedance Spectroscopy.
• Abstract:Anode-supported micro-tubular SOFCs based on a proton and oxide ion mixed conductor electrolyte, BaZr0.1Ce0.7Y0.1Yb0.1O3−δ (BZCYYb), have been successfully fabricated via phase-inversion process. Typical micro-tubular cell with the configuration of Ni-BZCYYb|BZCYYb|La0.6Sr0.4Co0.2Fe0.8O3-δ, consists of anode support, electrolyte and cathode with thicknesses of 200, 12 and 10 μm, respectively. The cells show excellent electrochemical performance with the peak power densities of 1.040, 0.902, 0.721 and 0.590 W cm-2 at 750, 700, 650 and 600 0C, respectively, with humidified (3 vol.% H2O) hydrogen as the fuel and ambient air as the oxidant. The AC impedance spectroscopy result shows low concentration polarization values of 0.016–0.021 Ω cm2 at 750–600 0C. Further, significant performance enhancement is observed during long-term stability test at 600 and 750 0C under constant voltage of 0.5 and 0.7 V over 120 h, respectively, indicating excellent stability of BZCYYb under fuel cell operating condition. The high performance is attributed to high-quality cell, validated by the dense, crack-free BZCYYb electrolyte film supported by the anode with micro sponge-like pores.
• Note:Yuan Dong, Xi’an University of Posts & Telecommunications Mingfei Liu, Georgia Institute of Technology Ben H. Rainwater, Georgia Institute of Technology Yaohui Bai, South China University of Technology
• Co-author:董元,Mingfei Liu,Ben H. Rainwater,Yaohui Bai
• First Author:chenzhangcheng
• Indexed by:Journal paper
• Volume:Accept
• ISSN No.:1615-6846
• Translation or Not:no
• Date of Publication:2019-11-21