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Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3-: δperovskite as a low-cost and efficient catalyst for oxygen reduction
Cui, Xiangzhi1; O'Hayre, Ryan2; Pylypenko, Svitlana2; Zhang, Linlin1; Zeng, Liming1; Zhang, Xiaohua1; Hua, Zile1; Chen, Hangrong1; Shi, Jianlin1
2017
Source PublicationDalton Transactions
ISSN14779226
Volume46Issue:40Pages:13903-13911
AbstractA precious metal-free cathode catalyst, mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3-δ(m-BSCF), with a well crystallized perovskite framework and a porous structure (pore size of ∼10 nm) has been synthesized by a one-step co-nanocasting method. The obtained mesoporous perovskite m-BSCF demonstrated a much higher oxygen reduction reaction catalytic activity than its macroporous (CS-BSCF of ∼5 μm pore size) and nonporous counterparts (SG-BSCF). The mesoporous structure and oxygen vacancies endowed the obtained perovskite oxide m-BSCF with an approximate 4e-pathway for the ORR comparable to the benchmark 20 wt% Pt/C and a stable electro-catalytic activity with 91% current density being retained after 5000 cycles, and excellent methanol tolerance. The redox couples Co4+/Co3+and Fe3+/Fe2+are proposed to accelerate the ORR on active species, i.e., MOOH (M = Co, Fe) groups produced by the substitution species of Co and Fe in the B-site of perovskite m-BSCF, and in the meantime oxygen vacancies generated by the redox couples play a key role in activating the oxygen molecules. © The Royal Society of Chemistry 2017.
DOI10.1039/c7dt03082g
EI Accession Number20174304290086
EI KeywordsOxygen vacancies
EI Classification Number482.2 Minerals - 533.1 Ore Treatment - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 933.1 Crystalline Solids - 951 Materials Science
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25693
Collection中国科学院上海硅酸盐研究所
Affiliation1.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai; 200050, China;
2.Department of Metallurgical and Materials Engineering, Colorado School of Mines, 1500 Illinois Street, Golden; CO; 80401, United States
Recommended Citation
GB/T 7714
Cui, Xiangzhi,O'Hayre, Ryan,Pylypenko, Svitlana,et al. Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3-: δperovskite as a low-cost and efficient catalyst for oxygen reduction[J]. Dalton Transactions,2017,46(40):13903-13911.
APA Cui, Xiangzhi.,O'Hayre, Ryan.,Pylypenko, Svitlana.,Zhang, Linlin.,Zeng, Liming.,...&Shi, Jianlin.(2017).Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3-: δperovskite as a low-cost and efficient catalyst for oxygen reduction.Dalton Transactions,46(40),13903-13911.
MLA Cui, Xiangzhi,et al."Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3-: δperovskite as a low-cost and efficient catalyst for oxygen reduction".Dalton Transactions 46.40(2017):13903-13911.
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