Performance of a solid oxide fuel cell utilizing hydrogen sulfide as fuel |
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| Affiliation: | 1. Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino 2, 56126 Pisa, Italy;2. Department of Civil, Chemical and Environmental Engineering, University of Genova, P.le J.F. Kennedy 1, 16129 Genova, Italy;3. Institute of Condensed Matter Chemistry and Technology for Energy, National Research Council (CNR-ICMATE), Via De Marini 6, 16149 Genova, Italy;4. Department of Chemical Engineering, Massachusetts Institute of Technology, Ames Street 25, Cambridge, MA 02139, USA;5. Department of Mathematics, Massachusetts Institute of Technology, Memorial Drive 182, Cambridge, MA 02139, USA;1. CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB UPR9048, F-33600 Pessac, France;2. Laboratoire de Réactivité et de Chimie des Solides, Université de Picardie Jules Verne, CNRS UMR#7314, F-80039 Amiens, France;3. RS2E, Réseau Français sur le Stockage Electrochimique de l''Energie, CNRS FR#3459, F-80039 Amiens, France |
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| Abstract: | The electrochemical performance of a hydrogen sulfide solid oxide fuel cell having the configuration H2S, Pt/(ZrO2)0.92(Y2O3)0.08/Pt, air has been examined at atmospheric pressure and 750–800°C, using both pure and 5% H2S anode feed streams. The performance of the cell is higher when using diluted H2S feed compared with pure H2S feed: current densities up to 100 mA cm−2 and power densities up to 15.4 mW cm−2 have been achieved using diluted H2S gas (5%) at 800°C. However, the platinum anode degrades over time in H2S stream due to the formation of PtS. Electrochemical oxidation of H2S on the Pt anode significantly accelerated its degradation. Polarization and impedance spectroscopy measurements show that at low current density (i) electrochemical reaction is the major cause of polarization in the fuel cell. Ohmic loss due to the resistance of the electrolyte material and the electrical connecting wire is a major part of cell polarization at high i. |
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