TY - CONF

T1 - Solid oxide fuel cell performance under severe operating conditions

A1 - Koch,Søren

A1 - Hendriksen,P.V.

A1 - Mogensen,Mogens Bjerg

A1 - Liu,Yi-Lin

A1 - Dekker,N.

A1 - Rietveld,B.

A1 - Haart,B. de

A1 - Tietz,F.

AU - Koch,Søren

AU - Hendriksen,P.V.

AU - Mogensen,Mogens Bjerg

AU - Liu,Yi-Lin

AU - Dekker,N.

AU - Rietveld,B.

AU - Haart,B. de

AU - Tietz,F.

PB - Wiley - V C H Verlag GmbH & Co. KGaA

PY - 2006

Y1 - 2006

N2 - <p>The performance and degradation of Solid Oxide Fuel Cells (SOFC) were studied under severe operating conditions. The cells studied were manufactured in a small series by ECN, in the framework of the EU funded CORE-SOFC project. The cells were of the anode-supported type with a double layer LSM cathode. They were operated at 750 °C or 850 °C in hydrogen with 5% or 50% water at current densities ranging from 0.25 A cm^–2 to 1 A cm^–2 for periods of 300 hours or more. The area specific cell resistance, corrected for fuel utilisation, ranged between 0.20 Ω cm² and 0.34 Ω cm² at 850 °C and 520 mV, and between 0.51 Ω cm² and 0.92 Ω cm² at 750 °C and 520 mV.</p> <p>The degradation of cell performance was found to be low (ranging from 0 to 8%/1,000 hours) at regular operating conditions. Voltage degradation rates of 20 to 40%/1,000 hours were observed under severe operating conditions, depending on the test conditions.</p> <p>Data analysis revealed a critical cell voltage of ca 750 mV, above which the degradation rates were trivial, but below which they were significant.</p> <p>Some cells were also tested using a different procedure to that usually applied at Risø. This gave a different aging behaviour, indicating that the detailed test circumstances may be decisive to the outcome.</p>

AB - <p>The performance and degradation of Solid Oxide Fuel Cells (SOFC) were studied under severe operating conditions. The cells studied were manufactured in a small series by ECN, in the framework of the EU funded CORE-SOFC project. The cells were of the anode-supported type with a double layer LSM cathode. They were operated at 750 °C or 850 °C in hydrogen with 5% or 50% water at current densities ranging from 0.25 A cm^–2 to 1 A cm^–2 for periods of 300 hours or more. The area specific cell resistance, corrected for fuel utilisation, ranged between 0.20 Ω cm² and 0.34 Ω cm² at 850 °C and 520 mV, and between 0.51 Ω cm² and 0.92 Ω cm² at 750 °C and 520 mV.</p> <p>The degradation of cell performance was found to be low (ranging from 0 to 8%/1,000 hours) at regular operating conditions. Voltage degradation rates of 20 to 40%/1,000 hours were observed under severe operating conditions, depending on the test conditions.</p> <p>Data analysis revealed a critical cell voltage of ca 750 mV, above which the degradation rates were trivial, but below which they were significant.</p> <p>Some cells were also tested using a different procedure to that usually applied at Risø. This gave a different aging behaviour, indicating that the detailed test circumstances may be decisive to the outcome.</p>

KW - Brændselsceller og brint

KW - Accelerated test

KW - Anode

KW - Cathode activation

KW - Degradation

KW - Impedance spectroscopy

KW - SOFC

U2 - 10.1002/fuce.200500112

DO - 10.1002/fuce.200500112

JO - Fuel Cells

JF - Fuel Cells

SN - 1615-6846

IS - 2

VL - 6

SP - 130

EP - 136

ER -