Performance and durability of Ni-YSZ supported solid oxide electrolysis cells (SOECs) for co-electrolysis of H2O and CO2 at high current density was investigated. The cells consist of a Ni-YSZ support, a Ni-YSZ electrode, a YSZ electrolyte, and an LSM-YSZ electrode. The durability was examined at 800°C and electrolysis current densities of −1 or −1.5 A/cm2 with 60% reactant (H2O + CO2) utilization. The cell voltage degradation showed a strong dependence on the electrolysis current density. Electrochemical characterization of the cells showed that the degradation was mainly related to the LSM-YSZ electrode when operated at −1 A/cm2, whereas at increased current density (−1.5 A/cm2), both the Ni-YSZ and the LSM-YSZ electrode degraded. The initial degradation (0 - 200 h) is mostly due to increasing of polarization resistance, while the long term degradation is mainly caused by increasing of serial resistance.
|Journal||Journal of the Electrochemical Society|
|Publication status||Published - 2013|
|Event||220th ECS Meeting - Boston, MA, United States|
Duration: 9 Oct 2011 → 14 Oct 2011
Conference number: 220
|Conference||220th ECS Meeting|
|Period||09/10/2011 → 14/10/2011|