期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201704907
关键词
cathodes; ceramics; electrodes; fuel cells; solid oxide fuel cells (SOFCs)
类别
资金
- US Department of Energy SECA Core Technology Program [FC FE0026106, FC-FE0009652]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
Composite cathodes of solid oxide fuel cells (SOFCs) are normally fabricated by mechanical mixing of electronic- and ionic-conducting phases. Here, a dual-phase SOFC cathode, composed of perovskite PrNi0.5Mn0.5O3 (PNM) and exsoluted fluorite PrOx particles, produced in situ through a glycine-nitrate solution combustion process, is reported. When applied as the cathode for a BaZr0.1Ce0.7Y0.1Yb0.1O3-based protonic ceramic fuel cell, the hybrid cathode displays excellent electrocatalytic activity (area-specific resistance of 0.052 cm(2) at 700 degrees C) and remarkable long-term stability when operated at a cell voltage of 0.7 V for approximate to 500 h using H-2 as fuel and ambient air as oxidant. The excellent performance is attributed to the proton-conducting BaPrO3-based coating and high-concentration oxygen vacancies of a Ba-doped PNM surface coating, produced by the reaction between the cathode and Ba from the electrolyte (via evaporation or diffusion), as confirmed by detailed X-ray photoelectron spectroscopy, Raman spectroscopy, and density functional theory-based calculations.
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