In situ reduction and evaluation of anode supported single chamber solid oxide fuel cellsReportar como inadecuado

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* Corresponding author 1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels 2 LGF-ENSMSE - UMR 5307 - Laboratoire Georges Friedel 3 PRESSIC-ENSMSE - Procédés et REactivité des Systèmes Solide-gaz, Instrumentation et Capteurs 4 LICB - Laboratoire Interdisciplinaire Carnot de Bourgogne

Abstract : Single chamber anode-supported fuel cells are investigated under several methane-oxygen-nitrogen atmospheres at intermediate temperatures 500°C-700°C. Ce0.9Gd0.1O1.95 CGO is chosen as electrolyte and deposited by screen-printing onto NiO-CGO anode pellets. A cathode composed of 70 wt% La0.6Sr0.4Co0.2Fe0.8O3−δ LSCF and 30 wt% of CGO is screen-printed onto the electrolyte. Thermogravimetric analyses of anode reduction are performed at 700 °C. Carbon deposition is observed under diluted methane but a successful reduction is obtained after an initialization under diluted methane followed by a final treatment under methane-to-oxygen ratio Rmix of 2. Anode-supported fuel cells are investigated regarding the working temperature and Rmix. Two types of cells are prepared with modifications of the electrolyte microstructure. For both cells tested, the Open Circuit Voltage OCV, the power density and the fuel utilization increase when Rmix and temperature decrease. The electrolytes of both cells have a porous microstructure and the electrolyte of the second cell, with the highest thickness, brings better performances. At 600 °C for Rmix = 0.6, the maximum power density is improved from 60 for the first cell to 160 mW cm−2 for the second cell. Comparing the fuel utilization, it increases from 3% for the first cell to 6% for the second one for the same testing conditions.

Keywords : Single chamber SOFC Methane Anode-supported cell

Autor: Damien Rembelski - Mathilde Rieu - Lionel Combemale - Jean-Paul Viricelle -



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