Hirotaka Takayanagi
Temperature-Programmed Desorption Analysis of Nickel-Cobalt and Zirconia System Cermet Pariticles
Kazunori SATO
Since various reaction elementary steps occurs in the interface of an electrode and an electrolyte when methane using in solid oxide fuel cells(SOFCs). It is important to clear the reaction process in order to promote improvement in fuel cell performance. Temperature-Programmed Desorption(TPD) mesurement is the analysis technique which demonstrate adsorption / desorption reaction of the gas molecule on the surface of solid sample.
In this research, the adsorption of methane and the desorption of products formed at the anode have been investigated by the TPD technique. The TPD analysis was carried out for the particles consisting of Ni1-xCox-YSZ(Yttria-Stabilized Zirconia). The activation energy of the desorption reaction was analyzed by the isostere method from the TPD curve. It discussed from the activation energy of the desorption reaction and the TPD curve about the solute effect to Ni of Co.
It was found that the substisution of Co atoms for Ni atoms in the Ni-Co alloy system of the Ni1-xCox-YSZ cermet increase the number of adsorption site to methane molecule. It was shown that the influence of the Ni1-xCox alloy composition to the activation energy in desorption of adosrbed methane molecule and adsorobed hydrogen molecule was little, but the activation energy in desorption of adsorbed carbon monoxide decreased by the substisution of Co atoms for Ni atoms.
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