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Development of Solid Oxide Fuel Cell Anodes Using Metal‐Coated Pore‐Forming Agents
Author(s) -
Corbin Stephen F.,
Qiao Xin
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03312.x
Subject(s) - materials science , anode , graphite , solid oxide fuel cell , conductivity , percolation threshold , oxide , percolation (cognitive psychology) , tape casting , volume fraction , metal , composite material , volume (thermodynamics) , suspension (topology) , chemical engineering , metallurgy , electrical resistivity and conductivity , electrode , ceramic , chemistry , electrical engineering , physics , mathematics , engineering , quantum mechanics , neuroscience , homotopy , pure mathematics , biology
Adding Ni‐coated graphite particulates to a tape casting colloidal suspension is capable of creating a sintered solid oxide fuel cell anode with a critical percolation threshold for conductivity significantly lower than conventional anode materials. For example, conductivity at 800°C reached over 1200 Ω −1 ·cm −1 in these anodes at a Ni volume below the percolation threshold reported for conventional anode materials. This behavior was explained based on an “effective” Ni content, V Nieff , which includes the graphite portion of the particle. In the green tape, V Nieff controls the creation of a percolating network of Ni. However, when the graphite burns away, it leaves a percolated Ni network at a much lower volume fraction than would otherwise be required.