Essential microstructure of cathode functional layers of solid oxide electrolysis cells for CO2 electrolysis. (July 2019)

• Record Type: Journal Article
• Authors: Wang, Tengpeng; Tian, Yingying; Li, Tianpei; Yu, Libo; Ye, Zhengmao; Wei, Tao; Wang, Zhi; Yao, Jianfeng; Buckley, C.E.; Dong, Dehua
• Is Part Of: Journal of CO₂ utilization. Volume 32(2019)
• Page Start: 214
• Page End: 218
• Publication Date: 2019-07
• Subjects: Solid oxide cells -- Functional layer -- Microchannel structure -- Dendritic pore structure -- CO2 electrolysis; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2019.04.021
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: Cathode functional layers of SOECs play an essential role in CO2 electrolysis Dendritic pore structure showed the better performance than microchannel structure Dendritic pore structure has high resistance to sintering during cell preparation Abstract: This study has demonstrated the importance of cathode functional layer of solid oxide electrolysis cells for CO2 electrolysis via comparing with that of solid oxide fuel cells and varying microstructure. Reducing inactive CO2 over cathodes dominates CO2 electrolysis performance in solid oxide electrolysis cells while H2 oxidation over Ni-based anodes has less effect on solid oxide fuel cells performance. Two supporting cathodes with different functional layer microstructure are compared. The cathode with dendritic pore structure shows higher performance than that with microchannel structure in terms of gas diffusion and polarization resistance owing to the faster gas diffusion pathway. The dendritic pore structure also prevents particle sintering during densifying electrolyte film. Therefore, the microstructure of cathode functional layer plays an essential role in CO2 electrolysis.