Oxygen electrode degradation in solid oxide cells operating in electrolysis and fuel cell modes: LSCF destabilization and interdiffusion at the electrode/electrolyte interface
نویسندگان
چکیده
Three long-term experiments have been performed in SOEC and SOFC modes at different operating temperatures. The durability tests confirm a higher degradation electrolysis mode with respect to fuel cell operation. In addition, larger increase of the ohmic resistance is observed for operated temperature mode. oxygen electrodes pristine tested cells characterized by synchrotron X-ray micro-diffraction micro-fluorescence assess relation between material destabilization formation insulating phases due interlayer diffusion. analyses presence after electrode sintering strontium zirconate Gd-rich interdiffusional layer electrolyte just below zirconates. Moreover, evolutions LSCF unit volume reveal segregation aging. associated linked accumulation SrZrO 3 barrier layer/interdiffusional interface operation both phenomena are found be thermally-activated promoted Finally, crystallographic evolution has investigated diffraction. A slight phase peaks intensity detected highest correlated largest this condition. Based on these preliminary results, it proposed that loss Zr 4+ from zirconates could facilitate interdiffusion Gd, reducing local ionic conductivity thus significantly contributing case. • Long-term Oxygen electrode/electrolyte synchrotron-based μXRD/μXRF. Strontium sintering. Evolution reveals Sr Possible high temperature.
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ژورنال
عنوان ژورنال: International Journal of Hydrogen Energy
سال: 2021
ISSN: ['0360-3199', '1879-3487']
DOI: https://doi.org/10.1016/j.ijhydene.2021.07.054