Journal
SCIENCE
Volume 349, Issue 6254, Pages 1321-1326Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aab3987
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- Advanced Research Projects Agency-Energy (ARPA-E) under the REBELS program [DE-AR0000493]
- National Science Foundation Materials Research Science and Engineering Centers program [DMR-0820518]
- Petroleum Institute in Abu Dhabi, United Arab Emirates
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Because of the generally lower activation energy associated with proton conduction in oxides compared to oxygen ion conduction, protonic ceramic fuel cells (PCFCs) should be able to operate at lower temperatures than solid oxide fuel cells (250 degrees to 550 degrees C versus >= 600 degrees C) on hydrogen and hydrocarbon fuels if fabrication challenges and suitable cathodes can be developed. We fabricated the complete sandwich structure of PCFCs directly from raw precursor oxides with only one moderate-temperature processing step through the use of sintering agents such as copper oxide. We also developed a proton-, oxygen-ion-, and electron-hole-conducting PCFC-compatible cathode material, BaCo0.4Fe0.4Zr0.1Y0.1O3-delta (BCFZY0.1), that greatly improved oxygen reduction reaction kinetics at intermediate to low temperatures. We demonstrated high performance from five different types of PCFC button cells without degradation after 1400 hours. Power densities as high as 455 milliwatts per square centimeter at 500 degrees C on H-2 and 142 milliwatts per square centimeter on CH4 were achieved, and operation was possible even at 350 degrees C.
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