Intermediate-temperature electrochemical performance of a polycrystalline PrBaCo2O5+δ cathode on samarium-doped ceria electrolyte

被引:336
作者
Chen, Dengjie [1 ]
Ran, Ran [1 ]
Zhang, Kun [1 ]
Wang, Jun [1 ]
Shao, Zongping [1 ]
机构
[1] Nanjing Univ Technol, Coll Chem & Chem Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 210009, Peoples R China
基金
中国国家自然科学基金;
关键词
Solid-oxide fuel cells; Impedance spectroscopy; Mixed conductor; PrBaCo2O5+delta; Cathode; SOLID-OXIDE FUEL; LAYERED PEROVSKITE; OXYGEN; CELL; SOFC; GDBACO2O5+X; DIFFUSION; KINETICS; EXCHANGE; FE;
D O I
10.1016/j.jpowsour.2008.11.045
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A-site cation-ordered PrBaCo2O5+delta (PrBC) double perovskite oxide was synthesized and evaluated as the cathode of an intermediate-temperature solid-oxide fuel cell (IT-SOFC) on a samarium-doped ceria (SDC) electrolyte. The phase reaction between PrBC and SDC was weak even at 1100 degrees C. The oxygen reduction mechanism was investigated by electrochemical impedance spectroscopy characterization. Over the intermediate-temperature range of 450-700 degrees C, the electrode polarization resistance was mainly contributed from oxygen-ion transfer through the electrode-electrolyte interface and electron charge transfer over the electrode surface. An area-specific resistance as low as similar to 0.4 Omega cm(2) was measured at 600 degrees C in air, based on symmetric cell test. A thin-film SDC electrolyte fuel cell with PrBC cathode was fabricated which delivered attractive peak power densities of 620 and 165 mW cm(-2) at 600 and 450 degrees C, respectively. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:96 / 105
页数:10
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