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Indexed by:期刊论文

Date of Publication:2011-03-01

Journal:JOURNAL OF POWER SOURCES

Included Journals:Scopus、SCIE、EI

Volume:196

Issue:5

Page Number:2779-2784

ISSN No.:0378-7753

Key Words:Solid oxide fuel cell; Anode; Methane; Reaction

Abstract:Dry methane with different concentrations is directly fed to solid oxide fuel cells (SOFCs) with a Ni-yttria-stabilized zirconia (Ni-YSZ) anode and a Ni-scandia-stabilized zirconia (Ni-ScSZ) anode. The anode outlet gases are measured in situ by gas chromatography (GC) to study the reactions of dry methane at different current densities. The comparison between the measured open-circuit voltages (OCVs) and theoretical values, the quantitative analysis of components under different current densities and the activation energy analysis of elementary reactions of CH(4) are investigated to identify the types of reactions occurring to methane in SOFCs. It is found that reactions of partial oxidation, CH(4) + 2O(2-) -> CO + H(2)O + H(2) + 4e(-), CH(4) + 3O(2-) -> CO + 2H(2)O + 6e(-). and complete oxidation occur to CH(4) at the Ni-based anodes in sequence while the current density increasing. (C) 2010 Elsevier B.V. All rights reserved.