SOFC stack have in prospect to show high reliability and durability working in a temperature range of 650-800°C with degradation rate below 2% of voltage loss for 100 hours. The state of art fuel cells are expected to grant this behavior for long enough to consider this power source as one of the best solutions for the next future. The recognized bottleneck is currently related to the stacking materials: i.e. metals (frames and interconnects) and sealant. The investigation on sealing materials is the focus of this communication, with the aim to study a suitable method to evaluate in real time the degradation rate by measuring the capacitance of glass as function of operating parameters. A commercial glass ceramic sealant is used in connection with ferritic stainless steel AISI 441 and aged at 750°C for 500 h in single atmosphere of laboratory air. Electrochemical results are related to crystallinity and the structural feature of the glass.
Evaluation of glass sealant properties versus thermal ageing simulating switch on and off of an SOFC stack
Carpanese MP;Presto S;Viviani M;Barbucci A;
2015
Abstract
SOFC stack have in prospect to show high reliability and durability working in a temperature range of 650-800°C with degradation rate below 2% of voltage loss for 100 hours. The state of art fuel cells are expected to grant this behavior for long enough to consider this power source as one of the best solutions for the next future. The recognized bottleneck is currently related to the stacking materials: i.e. metals (frames and interconnects) and sealant. The investigation on sealing materials is the focus of this communication, with the aim to study a suitable method to evaluate in real time the degradation rate by measuring the capacitance of glass as function of operating parameters. A commercial glass ceramic sealant is used in connection with ferritic stainless steel AISI 441 and aged at 750°C for 500 h in single atmosphere of laboratory air. Electrochemical results are related to crystallinity and the structural feature of the glass.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
