High-performance PrBaCo₂O_5+δ–Ce_0.8Sm_0.2O_1.9 composite cathodes for intermediate temperature solid oxide fuel cell

详细信息    查看全文

• 作者：Chengjun Zhu ; Xiaomei Liu ; Cuishan Yi ; Li Pei ; Dejun Wang ; Duanting Yan ; Keguang Yao ; Tianquan Lü ; Wenhui Su
• 关键词：Composite cathode ; PrBaCo₂O_5+δ ; – ; Ce_0.8Sm_0.2O_1.9 ; Electrochemical performance ; Solid oxide fuel cells
• 刊名：Journal of Power Sources
• 出版年：2010
• 出版时间：1 June 2010
• 年：2010
• 卷：195
• 期：11
• 页码：3504-3507
• 全文大小：580 K

文摘

PrBaCo₂O_5+δ–Ce_0.8Sm_0.2O_1.9 (PBCO–SDC) composite material are prepared and characterized as cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). The powder X-ray diffraction result proves that there are no obvious reaction between the PBCO and SDC after calcination at 1100 °C for 3 h. AC impedance spectra based on SDC electrolyte measured at intermediate temperatures shows that the addition of SDC to PBCO improved remarkably the electrochemical performance of a PBCO cathode, and that a PBCO–30SDC cathode exhibits the best electrochemical performance in the PBCO–xSDC system. The total interfacial resistances R_p is the smallest when the content of SDC is 30 wt % , where the value is 0.035 Ω cm² at 750 °C, 0.072 Ω cm² at 700 °C, and 0.148 Ω cm² at 650 °C, much lower than the corresponding interfacial resistance for pure PBCO. The maximum power density of an anode-supported single cell with PBCO–30SDC cathode, Ni–SDC anode, and dense thin SDC/LSGM (La_0.9Sr_0.1Ga_0.8Mg_0.2O_3−δ)/SDC tri-layer electrolyte are 364, 521 and 741 mW cm⁻² at 700, 750 and 800 °C, respectively.