Enhanced cathodic activity by tantalum inclusion at B-site of La_(0.6)Sr_(0.4)Co_(0.4)Fe_(0.6)O_(3)based on structural property tailored via camphor-assisted solid-state reaction  

作　　者：Dingyu XIONG Sefiu Abolaji RASAKI Yangpu LI Liangdong FAN Changyong LIU Zhangwei CHEN 

机构地区：[1]Additive Manufacturing Institute,Shenzhen University,Shenzhen 518060,China [2]Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robotics,Shenzhen University,Shenzhen 518060,China [3]Department of Chemical and Petroleum Engineering,University of Calgary,Calgary T2N1N4,Canada [4]College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,China

出　　处：《Journal of Advanced Ceramics》2022年第8期1330-1342,共13页先进陶瓷（英文）

基　　金：This work is supported by the National Natural Science Foundation of China(No.51975384);Guangdong Basic and Applied Basic Research Foundation(No.2020A1515011547);Shenzhen Fundamental Research Project(Nos.JCYJ20190808144009478,20200731211324001).

摘　　要：Lanthanum strontium cobalt ferrite(LSCF)is an appreciable cathode material for solid oxide fuel cells(SOFCs),and it has been widely investigated,owing to its excellent thermal and chemical stability.However,its poor oxygen reduction reaction(ORR)activity,particularly at a temperature of≤800℃,causes setbacks in achieving a peak power density of>1.0 W·cm^(-2),limiting its application in the commercialization of SOFCs.To improve the ORR of LSCF,doping strategies have been found useful.Herein,the porous tantalum-doped LSCF materials(La_(0.6)Sr_(0.4)Co_(0.4)Fe_(0.5)7Ta_(0.03)O_(3)(LSCFT-0),La_(0.6)Sr_(0.4)Co_(0.4)Fe_(0.5)4Ta0.06O_(3),and La_(0.6)Sr_(0.4)Co_(0.4)Fe_(0.5)Ta0.1O_(3))are prepared via camphor-assisted solid-state reaction(CSSR).The LSCFT-0 material exhibits promising ORR with area-specific resistance(ASR)of 1.260,_(0.5)80,0.260,0.100,and 0.06Ω·cm^(2)at 600,650,700,750,and 800℃,respectively.The performance is about 2 times higher than that of undoped La_(0.6)Sr_(0.4)Co_(0.4)Fe_(0.6)O_(3)with the ASR of 2.515,1.191,_(0.5)96,0.320,and 0.181Ω·cm^(2)from the lowest to the highest temperature.Through material characterization,it was found that the incorporated Ta occupied the B-site of the material,leading to the enhancement of the ORR activity.With the use of LSCFT-0 as the cathode material for anode-supported single-cell,the power density of>1.0 W·cm^(-2)was obtained at a temperature<800℃.The results indicate that the CSSR-derived LSCFT is a promising cathode material for SOFCs.

关 键 词：tantalum-doped lanthanum strontium cobalt ferrite(LSCF) solid oxide fuel cell(SOFC) oxygen reduction reaction(ORR) solid-state synthesis reaction clean energy conversion 

分 类 号：TM911[电气工程—电力电子与电力传动]