Electrical conductivity and electrochemical performance of cobalt-doped BaZr0.1Ce0.7Y0.2O3-δ cathode
To develop efficient cathode materials for solid oxide fuel cells (SOFCs) based on Ba(Zr0.1Ce0.7Y0.2)O3-δ (BZCY) electrolyte, we have examined a series of cobalt-doped BZCY samples with the intended composition of BaZr0.1Ce0.7Y0.2O3-δ (where x = 0, 0.02, 0.05, 0.075, 0.1, 0.2). It is found that the solubility of cobalt is less than 10 mol% and the electrical conductivity of BaZr0.1Ce0.7Y0.2O3-δ decreased with the content of cobalt within this solubility. When the content of cobalt is greater than its solubility, a BaCoO3-based phase forms, which markedly increases the conductivity of the sample (e.g., 2.48 S/cm for a composite material with an intended composition of BaZr0.1Ce0.7Y0.2O3-δ at 700 °C). Typical cells with the cobalt-doped BZCY cathode display much-improved performance than cells with other transition metal doped barium cerate ever reported, yielding a polarization resistance of 0.085 Ω cm2 at 750 °C.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Heterogeneous Functional Materials Center (HeteroFoaM)
- Sponsoring Organization:
- USDOE SC Office of Basic Energy Sciences (SC-22)
- DOE Contract Number:
- SC0001061
- OSTI ID:
- 1383113
- Journal Information:
- International Journal of Hydrogen Energy, Journal Name: International Journal of Hydrogen Energy Journal Issue: 3 Vol. 36; ISSN 0360-3199
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
Similar Records
A mixed-conducting BaPr0.8In0.2O3-δ cathode for proton-conducting solid oxide fuel cells
Related Subjects
carbon sequestration
catalysis (heterogeneous)
charge transport
energy storage (including batteries and capacitors)
hydrogen and fuel cells
materials and chemistry by design
synthesis (novel materials)
synthesis (self-assembly)
synthesis (scalable processing)
mechanical behavior
membrane