Study of a solid oxide fuel cell fed with n-dodecane reformate. Part II: Effect of the reformate composition
Study of a solid oxide fuel cell fed with n-dodecane reformate. Part II: Effect of the reformate composition
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DOI：
10.1016/j.ijhydene.2016.06.048
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发表时间：
2017-01
影响因子：
7.2
通讯作者：
M. Faro;S. Trocino;S. Zignani;C. Italiano;A. Vita;A. Aricò
中科院分区：
文献类型：
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作者：
M. Faro;S. Trocino;S. Zignani;C. Italiano;A. Vita;A. Aricò
The electrochemical behaviour of a Solid Oxide Fuel Cell (SOFC) fed with n-dodecane reformate is investigated. Experiments are carried out at 800 °C by using a cell consisting of a supporting Ni anode, a thin double layer yttria-stabilised zirconia/yttria-doped ceria electrolyte and a perovskite cathode. A catalytic steam reformer (SR) is used for processing the n-dodecane at 800 °C. The reformer is operated with a steam to carbon (S/C) ratio varying progressively from 3 to 1 and a gas space velocity (GHSV) equal to 16,000 h−1, in the presence of a Rhsingle bondCeO2single bondZrO2catalyst. The composition of the reformate gas is determined by gas-chromatography before feeding the stream to the SOFC cell. An endurance test of 300 h for the coupled reformer-SOFC system shows a good stability using a range of S/C values from 3 to 1.5. Electrochemical ac-impedance spectra (EIS) and polarizations curves are carried out during the durability test to study the cell ageing. By decreasing the S/C to 1, an occlusion of the reforming reactor, as a consequence of n-dodecane cracking, occurs. Post-operation scanning electron microscopy analysis (SEM) of the SOFC cell shows that the Ni-based anode is not affected by any relevant deposition of carbon fibres including the inner pores. Whereas, the cracking process, occurring at low S/C values, is essentially involving the catalytic bed and the anode feed pipeline. However, the occurrence of high molecular weight hydrocarbons, already at S/C 1.5, causes a decrease of the cell performance. Accordingly, the best trade-off is achieved with S/C = 2.
