Forschungszentrum Julich - Progress in SOC Development

摘要

In this manuscript, various aspects of SOC development are outlined. Aiming for lower operating temperatures, the first results with a short stack operated at 550°C show promising performance. With respect to lifetime, the long-term test, operated at 700°C, was stopped after 100,000 hours, of which 93,000 hours were operated at 0.5 A·cm~(-2). In terms of design improvements, a 10-layer stack of the window-frame design was thermally cycled 80 times with a power degradation of less than 0.02%/cycle. In fact, a 5-layer stack of the lightweight cassette design was thermally cycled more than 400 times with a comparable result. Currently, a 5 kW reversible system (rSOC) has been in operation for more than 3,800 hours. It delivers 5.3 kW_(DC) in fuel cell mode at a DC system efficiency of 62.7% (LHV). In electrolysis operation, 4.75 Nm~3h~(-1) of hydrogen is produced at a 14.3 kW_(DC) stack input.