A cobalt-free Sm0.5Sr0.5Fe0.8Cu0.2O3−δ–Ce0.8Sm0.2O2−δ composite cathode for proton-conducting solid oxide fuel cells

• Published in: Journal of power sources 2011-03, Vol.196 (5), p.2631-2634
• Main Authors: Ling, Yihan, Yu, Jia, lin, Bin, Zhang, Xiaozhen, Zhao, Ling, Liu, Xingqin
• Format: Article
• Language: English
• Subjects: Applied sciences; Cobalt-free; Composite cathode; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; Materials; Polarization resistance; Power density; Proton-conducting solid oxide fuel cells
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2010.11.017

▶ The quad-layer single cells of NiO–BZCYYb/NiO–BZCYYb/BZCYYb/SSFCu–SDC show an excellent power density of 505mWcm−2 at 700°C. ▶ A low electrode polarization resistance of 0.138Ωcm2 is achieved at 700°C, which exhibits high electrochemical activity for operation at intermediate temperature range. ▶ The XRD spectrum of the SSFCu–SDC composite cathode indicates an excellent chemical compatibility between SSFCu and SDC at temperatures up to 1100°C. ▶ Adding Ce0.8Sm0.2O2−δ (SDC) electrolyte which is widely used for SOFCs based on SDC oxide ion conductors, into SSFCu cathode to prepare the composite cathode for H-SOFCs. Preliminary results demonstrate that the cobalt-free SSFCu–SDC composite is a promising cathode material for H-SOFCs. A cobalt-free composite Sm0.5Sr0.5Fe0.8Cu0.2O3−δ–Ce0.8Sm0.2O2−δ (SSFCu–SDC) is investigated as a cathode for proton-conducting solid oxide fuel cells (H-SOFCs) in intermediate temperature range, with BaZr0.1Ce0.7Y0.1Yb0.1O3−δ (BZCYYb) as the electrolyte. The XRD results show that SSFCu is chemically compatible with SDC at temperatures up to 1100°C. The quad-layer single cells of NiO–BZCYYb/NiO–BZCYYb/BZCYYb/SSFCu–SDC are operated from 500 to 700°C with humidified hydrogen (∼3% H2O) as fuel and the static air as oxidant. It shows an excellent power density of 505mWcm−2 at 700°C. Moreover, a low electrode polarization resistance of 0.138Ωcm2 is achieved at 700°C. Preliminary results demonstrate that the cobalt-free SSFCu–SDC composite is a promising cathode material for H-SOFCs.