Investigation of cobalt-free cathode material Sm0.5Sr0.5Fe0.8Cu0.2O3−δ for intermediate temperature solid oxide fuel cell

✍ Scribed by Yihan Ling; Ling Zhao; Bin Lin; Yingchao Dong; Xiaozhen Zhang; Guangyao Meng; Xingqin Liu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 636 KB
• Volume: 35
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.04.021

✦ Synopsis

A cobalt-free cubic perovskite oxide Sm 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3Àd (SSFCu) was investigated as a novel cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). The thermal expansion coefficient (TEC) of SSFCu was close to that of Sm 0.2 Ce 0.8 O 1.9 (SDC) electrolyte and the electrical conductivity of SSFCu sample reached 72e82 S cm À1 in the commonly operated temperatures of IT-SOFCs (400e600 C). Symmetrical electrochemical cell with the configuration of SSFCu/SDC/SSFCu was applied for the impedance study and area specific resistance (ASR) of SSFCu cathode material was as low as 0.085 U cm 2 at 700 C.

Laboratory-sized tri-layer cells of NiO-SDC/SDC/SSFCu were operated from 450 to 700 C with humidified hydrogen (w3% H 2 O) as fuel and the static air as oxidant. A maximum power density of 808 mW cm 2 was obtained at 700 C for the single cell.