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Contribution to the development of IDEAL-Cell, a new concept of intermediate temperature fuel cell

Abstract : Fuel cells are electrochemical devices that allow the conversion of chemical energy directly into electric energy with low impact to the environment. The improvement of fuel cell performances has been done through the synthesis of new materials with better electrical or electrocatalytic properties and the optimization of shaping methods that allow developing more efficient microstructures. A third path to reach the same objective is proposed in the work here presented: the development of IDEAL-Cell, a new concept of intermediate fuel cell. This concept consists in the anode part of a PCFC connected to the cathode part of a SOFC through a porous central membrane in which water is formed and evacuated. The activities developed were focused in two aspects: the fabrication of prototypes and the characterization of the central membrane. The proof of concept (PoC) prototypes were simplified complete cell structures of two dense electrolytes and one porous composite central membrane in which platinum electrodes were coated. They respect the four criteria previously defined as necessary to demonstrate the new concept : (i) a stable open circuit voltage, (ii) a stable polarization curve, (iii) a specific impedance fingerprint for water formation and (iv) detection of water exhausted from the cell as a result of its operation. The ability of the central membrane to allow the formation of water is determined by the measurement of the active reaction sites length. The method proposed is based on the analysis of 3D images of the central membrane obtained by X-ray microtomography. The water flow through the porous structure of the central membrane was studied. 3D images of two different types of structures were used to solve momentum and mass transfer equations through the finite element method.
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  • HAL Id : pastel-00711493, version 1

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Joao Abreu. Contribution to the development of IDEAL-Cell, a new concept of intermediate temperature fuel cell. Materials. École Nationale Supérieure des Mines de Paris, 2011. English. ⟨NNT : 2011ENMP0093⟩. ⟨pastel-00711493⟩

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