Nb-doped PrBa_(0.8)Ca_(0.2)Co_(2)O_(6)-based perovskite cathode with improved oxygen reduction reaction activity and stability for solid oxide fuel cells  

作　　者：Depeng Zeng Feng Zhu Kang Xu Hua Zhang Yangsen Xu Yu Chen 

机构地区：[1]School of Environment and Energy,South China University of Technology,Guangzhou 510006,China

出　　处：《Journal of Advanced Ceramics》2024年第10期1590-1599,共10页先进陶瓷（英文）

基　　金：supported by the Introduced Innovative R&D Team of Guangdong(No.2021ZT09L392);the National Natural Science Foundation of China(Nos.22179039 and 22005105);the Pearl River Talent Recruitment Program(No.2019QN01C693);the Natural Science Foundation of Guangdong Province(No.2021A1515010395).

摘　　要：The performance of a solid oxide fuel cell(SOFC)is strongly associated with the activity and durability of the cathode,where the oxygen reduction reaction occurs.In this study,we report our findings in the development of an Nb-doped PrBa_(0.8)Ca_(0.2)Co_(2)O_(6-δ)(PrBa_(0.8)Ca_(0.2)Co_(2-x)Nb_(x)O_(6-δ),x=0,0.025,0.05,and 0.1,denoted as PBCCNx)perovskite composite as the SOFC cathode.Analyses of X-ray diffraction(XRD)patterns and energy-dispersive transmission electron microscopy(TEM-EDS)images suggest that after being treated at 950℃ in air,PBCCN0.05 mainly contains phases of Ca-and Nb-doped PrBaCo2O6-δdouble perovskite,PrCoO_(3) perovskite with Ca and Nb doping,and Ba_(3)Ca_(1.18)Nb_(1.82)O_(9-δ).When evaluated as an SOFC cathode,the PBCCN0.05 mixture has shown a low polarization resistance of 0.0074Ω·cm^(2)at 800℃ in La_(0.8)Sr0.2Ga_(0.8)Mg_(0.2)O_(3)electrolyte symmetrical cells.Accordingly,anode-supported single cells with a configuration of Ni-Zr_(0.84)Y_(0.16)O_(2-δ)(YSZ)/YSZ/Gd_(0.1)Ce0.9O_(2-δ)/PBCCN0.05 display high electrochemical performance,with a peak power density of 1.81 W·cm^(-2)and a reasonable durability of 100 h at 800℃.PBCCN_(0.05)possesses a higher concentration of oxygen vacancies,a faster oxygen surface adsorption-dissociation rate,and an increased mass ratio of PrCoO_(3) perovskite with Ca and Nb doping compared to PrBa_(0.8)Ca_(0.2)Co_(2)O_(6)-δwithout Nb doping.

关 键 词：SELF-ASSEMBLY Nb doping cathodes oxygen reduction reactions solid oxide fuel cells(SOFCs) 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TQ174.1[化学工程—陶瓷工业]