期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 14, 页码 11180-11189出版社
AMER CHEMICAL SOC
DOI: 10.1021/am502240m
关键词
solid oxide fuel cell; oxygen reduction reaction; BaFeO3-delta; oxygen vacancy; surface exchange kinetics
资金
- National Science Foundation for Distinguished Young Scholars of China [51025209]
The widespread application of solid oxide fuel cell technology requires the development of innovative electrodes with high activity for oxygen reduction reaction (ORR) at intermediate temperatures. Here, we demonstrate that a cobalt-free parent oxide BaFeO3-delta (BF), which lacks long-range oxygen-ion diffusion paths, has surprisingly high electrocatalytic activity for ORR. Both in situ high-temperature X-ray diffraction analysis on room-temperature powder and transmission electron microscopy on quenched powder are applied to investigate the crystal structure of BF. Despite the lack of long oxygen-ion diffusion paths, the easy redox of iron cations as demonstrated by thermal gravimetric analysis (TGA) and oxygen temperature-programmed desorption and the high oxygen vacancy concentration as supported by iodometric titration and TGA benefit the reduction of oxygen to oxygen ions. Moreover, the electrical conductivity relaxation technique in conjunction with a transient thermogravimetric study reveals very high surface exchange kinetics of BF oxide. At 700 degrees C, the area specific resistance of BF cathode, as expressed by a symmetrical cell configuration, is only similar to.021 Omega cm(2), and the derived single fuel cell achieves high power output with a peak power density of 870 mW cm(-2). It suggests that an undoped BF parent oxide can be used as a high-efficiency catalyst for ORR.
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