材料科学
金属陶瓷
阳极
纳米颗粒
氧化物
合金
极化(电化学)
化学工程
成核
金属
固体氧化物燃料电池
电化学
冶金
纳米技术
陶瓷
电极
热力学
工程类
物理化学
物理
化学
作者
Tenglong Zhu,Horacio Esteban Troiani,Liliana Mogni,Minfang Han,Scott A. Barnett
出处
期刊:Joule
[Elsevier]
日期:2018-03-01
卷期号:2 (3): 478-496
被引量:218
标识
DOI:10.1016/j.joule.2018.02.006
摘要
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, Sr0.95(Ti0.3Fe0.63Ni0.07)O3−δ, yields anode polarization resistance competitive with Ni cermets, and substantially better than that of the corresponding Ni-free compound, SrTi0.3Fe0.7O3−δ. Exposure to fuel results in exsolution and nucleation of Ni0.5Fe0.5 nanoparticles uniformly dispersed on the Ni-substituted perovskite surface, whereas no nanoparticles are observed on SrTi0.3Fe0.7O3−δ. 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°C and low H2 partial pressures, suggesting that the nanoparticles improve performance by promoting H2 adsorption.
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