Achieving exceptional activity and durability toward oxygen reduction based on a cobalt-free perovskite for solid oxide fuel cells

作     者：Feifei Dong Zhenghui Gao Bingkai Zhang Lu Li Ziqi Kong Zilin Ma Meng Ni Zhan Lin Feifei Dong;Zhenghui Gao;Bingkai Zhang;Lu Li;Ziqi Kong;Zilin Ma;Meng Ni;Zhan Lin

作者机构：Guangzhou Key Laboratory of Clean Transportation Energy ChemistrySchool of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou 510006GuangdongChina Building Energy Research GroupDepartment of Building and Real EstateThe Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2021年第30卷第11期

页      面：653-659,I0016页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 080501[工学-材料物理与化学] 0827[工学-核科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：This work was financially supported by a startup R&D funding from One-Hundred Young Talents Program of Guangdong University of Technology,China(No.220413180) a Foundation for Youth Innovative Talents in Higher Education of Guangdong Province,China(No.2018KQNCX060) Joint Funds of Basic and Applied Basic Research Foundation of Guangdong Province,China(No.2019A1515110322) grants from Research Grant Council,University Grants Committee,Hong Kong SAR(Nos.PolyU 152214/17E and PolyU 152064/18E) 

主　　题：Solid oxide fuel cell Cathode Perovskite Oxygen reduction reaction Cobalt-free 

摘      要：In response to the shortcomings of cobalt-rich cathodes, iron-based perovskite oxides appear as promising alternatives for solid oxide fuel cells (SOFCs). However, their inferior electrochemical performance at reduced temperatures (700 ℃) becomes a major bottleneck for future progress. Here, a novel cobalt-free perovskite Ba_(0.75)Sr_(0.25)Fe_(0.875)Ga_(0.125)O_(3−δ) (BSFG) is developed as an efficient oxygen reduction electrode for SOFCs, featuring cubic-symmetry structure, large oxygen vacancy concentration and fast oxygen transport. Benefiting from these merits, cells incorporated with BSFG achieve exceptionally high electrochemical performance, as evidenced by a low polarization area-specific resistance of 0.074 Ω cm^(2) and a high peak power density of 1145 mW cm^(−2) at 600 ℃. Meanwhile, a robust short-term performance stability of BSFG cathode can be ascribed to the stable crystalline structure and favorable thermal expansion behavior. First-principles computations are also conducted to understanding the superior activity and durability toward oxygen reduction reaction. These pave the way for rationally developing highly active and robust cobalt-free perovskite-type cathode materials for reduced-temperature SOFCs.