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Communication Dans Un Congrès Année : 2023

Operando analysis of a Solid Oxide Fuel Cell in Environmental Transmission Electron Microscopy

Résumé

Owing to the recent advances in in situ and operando transmission electron microscopy (TEM), we have set up an experiment to operate a SOFC (Solid Oxide Fuel Cell) inside an environmental TEM to identify how the device microstructure controls its electrical behavior. An elementary anode-electrolyte-cathode sandwich was prepared by Focused Ion Beam (FIB), and mounted on a heating and biasing microelectromechanical (MEMS) based specimen holder (DENSsolutions) inserted a FEI Titan ETEM. The sample is made as a standard SOFC: the cathode is based on Sr-doped La manganite (LSM), the electrolyte is yttria-stabilized zirconia (YSZ) and the anode is a NiO cermet; both electrodes were co-sintered with YSZ. For practical reasons, we have used a single chamber configuration where the anode and cathode were exposed simultaneously to the oxidant (O2) and reducing (N2:H2 in the ratio 20:1) gases appropriately mixed during cycles at about 15 mbar up to 750°C: thanks to a difference in the catalytic activity between the electrodes, O2 reduces at the cathode, while H2 oxidizes at the anode. A transient regime could be obtained where a voltage difference was detected by the biasing system of the holder. The variation of current was correlated to the evolution of the gas fuel composition and the anode microstructure. The latter was followed by conventional and high resolution imaging, diffraction work and EELS (Electron Energy-Loss Spectroscopy) [1]. [1] The authors acknowledge METSA (www.metsa.fr), CLYM (www.clym.fr), FACTS and the start-up grant M4081924 at NTU, the INSTANT France-Singapore MERLION.
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Dates et versions

hal-04102050 , version 1 (22-05-2023)

Identifiants

  • HAL Id : hal-04102050 , version 1

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T. Epicier. Operando analysis of a Solid Oxide Fuel Cell in Environmental Transmission Electron Microscopy. 3ème réunion plénières de la FRH2, May 2023, Saint Gilles Les Bains, France. ⟨hal-04102050⟩
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