Article Dans Une Revue International Journal of Hydrogen Energy Année : 2025

Engineering nanostructured electrodes for solid oxide cells (SOCs) via microstructural and electrochemical modelling

Résumé

The design optimization of nanostructured-infiltrated electrodes for solid oxide cells was investigated by combining microstructural and electrochemical models. A large dataset of nanostructured electrodes (>70) was synthetically generated through an original approach, which combined validated random field and particle-based frameworks. The electrode microstructural correlations were studied by evaluating the impact of the nanoparticles size and loading on the resulting characteristics of the infiltrated phase (i.e. tortuosity factor, percolating fraction and density of active sites). Eventually, the microstructural properties of selected infiltrated microstructures, holding the highest density of triple phase boundary sites (16-112 μm−2), were used as inputs of a 1D electrochemical model tailored for Ni-YSZ electrodes. The simulated polarization resistances of optimized Ni-infiltrated YSZ backbones resulted to sweep in the 0.012–0.021 Ω⋅cm2 range at 750 °C, thus being considerably lower than the value measured for a classic Ni-YSZ composite cermet, 0.071 Ω⋅cm2. Infiltrated Ni-YSZ composites also resulted to potentially improve the reference electrochemical response, showing polarization resistances in the 0.23–0.32 Ω⋅cm2 range. Nonetheless, the integrated microstructural and electrochemical approach highlighted the crucial importance of the catalyst percolation. Significant performance limitations were evidenced when the percolation of Ni nanoparticles was lower than 50%, due to the insufficient effective transport properties.

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Matériaux Autre
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hal-04879825 , version 1 (21-01-2025)

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Davide Cademartori, Maxime Hubert, Elise Bonnet, Jean-Marc. Bassat, Jérôme Laurencin. Engineering nanostructured electrodes for solid oxide cells (SOCs) via microstructural and electrochemical modelling. International Journal of Hydrogen Energy, 2025, 98, pp.1396-1414. ⟨10.1016/j.ijhydene.2024.11.484⟩. ⟨hal-04879825⟩
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