期刊
JOULE
卷 2, 期 3, 页码 478-496出版社
CELL PRESS
DOI: 10.1016/j.joule.2018.02.006
关键词
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资金
- US Department of Energy [DE-SC0016965]
- AGNPCyT [PICT 2013-1032]
- CONICET [11220150100565CO]
- Universidad Nacional de Cuyo
- Ministry of Science and Technology of China [2017YFB0601901, 2017YFB0601903]
- Tsinghua University Initiative Scientific Research Program [2015THZ0]
- State Scholarship Fund of China Scholarship Council [201406430041]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF NNCI-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- U.S. Department of Energy (DOE) [DE-SC0016965] Funding Source: U.S. Department of Energy (DOE)
Electrically conducting oxides have been proposed as alternatives to Ni-based cermet anodes for solid oxide fuel cells (SOFCs) to overcome issues such as coking and impurity poisoning, but their electrochemical performance is typically inferior to that of Ni-based cermets. Here we show that a new oxide composition, Sr-0.95(Ti0.3Fe0.63Ni0.07)O3-delta, yields anode polarization resistance competitive with Ni cermets, and substantially better than that of the corresponding Ni-free compound, SrTi0.3Fe0.7O3-delta. Exposure to fuel results in exso-lution and nucleation of Ni0.5Fe0.5 nanoparticles uniformly dispersed on the Ni-substituted perovskite surface, whereas no nanoparticles are observed on SrTi0.3Fe0.7O3-delta. A general thermodynamic model is developed that quantitatively predicts exsolved nanoparticle composition. The reduction in anode polarization resistance by the nanoparticles, by as much as 4 times, is most pronounced at cell operating temperatures below 800 degrees C and low H-2 partial pressures, suggesting that the nanoparticles improve performance by promoting H-2 adsorption.
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