Performance Degradation of a Double-Perovskite PrBaCo 2 O 5+δ Cathode Operating under a CO 2 /H 2 O-Containing Atmosphere.
Lin ZhuPengzhang LiYuanyuan LiXiaonan FuYuanyuan QiJuntao WangZaixu LiuHongyan YangPublished in: Molecules (Basel, Switzerland) (2024)
The electrochemical activity and stability of the PBCO electrode are investigated under the annealing processes in an atmosphere containing CO 2 /H 2 O for solid oxide fuel cells (SOFCs). The electrochemical impedance spectrum results unequivocally confirm the significant deterioration in PBCO cathode performance upon annealing under ambient air conditions, particularly when exposed to CO 2 /H 2 O atmospheres. Microstructure and surface chemical state analyses reveal the segregation of BaO on the PBCO surface, and the formation of insulating BaCO 3 degraded the electrochemical performance. CO 2 and H 2 O exhibit a significant induced effect on the segregation of Ba in PBCO to the surfaces, thereby causing a rapid decline in electrode performance. Additionally, the analysis of volume relaxation reveals that the presence of oxygen in the electrode environment can also influence the deposition process occurring on the surface of the electrode. However, this phenomenon is not observed in N 2 . This study emphasizes the impact of various gases present in the working atmosphere on surface-separated BaO, which consequently plays a pivotal role in the activity and long-term stability of PBCO electrodes.
Keyphrases
- gold nanoparticles
- carbon nanotubes
- ionic liquid
- reduced graphene oxide
- solid state
- air pollution
- solar cells
- genome wide
- magnetic resonance
- atomic force microscopy
- staphylococcus aureus
- dna methylation
- room temperature
- gene expression
- cell proliferation
- biofilm formation
- high glucose
- cell cycle arrest
- mass spectrometry
- signaling pathway
- pi k akt
- endoplasmic reticulum stress
- oxide nanoparticles