Characterization of PrBa0.92CoCuO6-δ as a potential cathode material of intermediate-temperature solid oxide fuel cell

被引：22
作者：
Jiang, Xuening [1 ]
Wang, Jiao [1 ]
Jia, Guoqiang [1 ]
Qie, Zijian [1 ]
Shi, Yuchao [1 ]
Idrees, Asim [1 ]
Zhang, Qingyu [1 ]
Jiang, Lei [2 ]
机构：
[1] Dalian Univ Technol, Sch Phys & Optoelect Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China
[2] Chinese Acad Sci, Dalian Inst Chem & Phys, Dalian 116023, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2017年 / 42卷 / 09期
基金：
中央高校基本科研业务费专项资金资助;
关键词：
Solid oxide fuel cell; Cathode; Point defects; Thermal expansion coefficient; Electrochemical performance; ELECTROCHEMICAL PROPERTIES; PEROVSKITE OXIDES; OXYGEN REDUCTION; PERFORMANCE; LNBACO(2)O(5+DELTA); ELECTROLYTE; DIFFUSION; EFFICIENT; X=0.1;
D O I：
10.1016/j.ijhydene.2016.12.076
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：
PrBa0.92CoCuO6-delta (PB0.92CoCu), a layered perovskite oxide with Ba2+-deficiency at A-site and Cu2+ doping at B-site was synthesized and characterized as cathode material of intermediate-temperature solid oxide fuel cell (IT-SOFC) in comparison with performance of the parent oxide of PrBaCo2O6-delta (PBCoO). PB0.92CoCu had the same phase structure as that of PBCoO but showed a slight lattice expansion. Results of iodometric titration and thermogravimetry (TG) measurements demonstrated that PB0.92CoCu had a higher concentration of oxygen vacancy than PBCoO did. Electrical conductivities of PB0.92CoCu ranged from 255 S cm(-1) at 400 degrees C to 134 S cm(-1) at 800 degrees C in air, meeting the requirement for the cathode of SOFCs. Thermal expansion coefficient (TEC) of PB0.92CoCu was about one quarter decreased compared with TEC of PBCoO. PB0.92CoCu showed improved electrochemical performance than PBCoO characterized by low area specific resistances (ASRs) ranging from 0.12 Omega cm(2) at 600 degrees C to 0.017 Omega cm(2) at 750 degrees C. High peak power densities, 1541 mW cm(-2) at 800 degrees C, 1228 mW cm(-2) at 750 degrees C and 930 mW cm(-2) at 700 degrees C were achieved in a single cell using the PB0.92CoCu cathode. This single cell also showed an operational stability using hydrogen fuel at 650 degrees C without any decay for 100 h. These results have demonstrated that PB0.92CoCu is a promising cathode material of IT-SOFCs. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：6281 / 6289
页数：9
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