摘要
Although metallic interconnects have many advantages,the formation of Cr2O3 scale and the evaporation of Cr(Ⅵ)species from alloys will greatly degrade the solid oxide fuel cell(SOFC)performance.In this paper,the electrochemical impedance spectroscopy(EIS)and the cathode polarization method of galvanostatic current interruption were employed to investigate the deposition mechanism of chromium with the electrochemical behavior of LSM cathode in the presence of chromia-forming alloys.The results show that the dissociative adsorption and the diffusion of oxygen on the LSM surface were inhibited by the gaseous chromium species and the migration processes of oxygen ions into YSZ electrolyte were inhibited by the solid chromium species deposited on the YSZ surface.
Although metallic interconnects have many advantages, the formation of Cr2o3 scale and the evaporation of Cr（ Ⅵ ） species from alloys will greatly degrade the solid oxide fuel cell（SOFC） performance. In this paper, the electrochemical impedance spectroscopy（EIS） and the cathode polarization method of galvanostatic current interruption were employed to investigate the deposition mechanism of chromium with the electrochemical behavior of LSM cathode in the presence of chromia-forming alloys. The results show that the dissociative adsorption and the diffusion of oxygen on the LSM surface were inhibited by the gaseous chromium species and the migration processes of oxygen ions into YSZ electrolyte were inhibited by the solid chromium species deposited on the YSZ surface.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第9期1762-1764,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:90510006)资助.
关键词
固体氧化物燃料电池
铬
阴极
LSM
Solid oxide fuel cell
Chromium
Cathode
La0.8Sr0.2MnO3-δ
