DEGRADATION IN PERFORMANCE OF LANTHANUM STRONTIUM MANGANITE BASED SOLID OXIDE FUEL CELL CATHODES UNDER ACCELERATED TESTING
Other
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OSTI ID:1779577
- Case Western Reserve University
The performance of solid oxide fuel cells (SOFCs) with three different lanthanum strontium manganite (LSM) based cathode compositions were evaluated. All cells were yttria-stabilized zirconia (Zr0.92Y0.08O2-δ, 8YSZ) electrolyte-supported button cells, consisting of a nickel oxide – yttria-stabilized zirconia (NiO-8YSZ) anode and a cathode of 8YSZ and LSM. The three LSM compositions differed in the amount of excess Mn: Composition A was (La0.85Sr0.15)0.90MnO3±δ (10% excess Mn); Composition B was (La0.80Sr0.20)0.95MnO3±δ (5% excess Mn); and Composition C was (La0.80Sr0.20)0.98MnO3±δ (2% excess Mn). The cells were tested under conventional and accelerated conditions, where the accelerated conditions were meant to simulate the results of months of long-term testing in just 500 hours (approximately three weeks) of testing by using high operating temperature and current density. Accelerated tests showed lower degradation rates, lower continuous area specific resistance (ASR), and higher power output than conventional tests for all cathode compositions. Continuous measurements of the cells' output voltage versus time, together with periodic electrochemical impedance spectroscopy (EIS) measurements, were used to evaluate the performance of the cells in terms of ASR degradation rates (% ASR rise per kh) and power outputs. The EIS measurements also permitted a partial deconvolution of the cathode ASR from the anode ASR. Cathodes with 10% excess Mn tested under accelerated conditions had the lowest degradation rates, but the highest continuous ASR and lowest power outputs. Cathodes with 2% excess Mn tested under accelerated conditions had the lowest continuous ASR and highest power outputs; thus it was concluded that cells with the lowest amount of excess Mn cathodes performed the best.
- Research Organization:
- Case Western Reserve University
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- Contributing Organization:
- LG Fuel Cell Systems
- DOE Contract Number:
- FE0023476
- OSTI ID:
- 1779577
- Country of Publication:
- United States
- Language:
- English
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