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Synthèse et propriétés de monocristaux, de poudres, films minces ou hétérostructures

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Publication de Monica Burriel 2016

Publié le 23 décembre 2016
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Communiqué du 21 décembre 2016 au 22 décembre 2016

Le papier "Design of La2-xPrxNiO4+d SOFC cathodes: a compromise between electrochemical performance and thermodynamic stability" a été publié dans Journal of Materials Chemistry A

Ici  vous trouverez le papier de Monica  Burriel

"Architecturally designed La2xPrxNiO4+d (with x ¼ 0, 0.5, 1 and 2) cathodes on the Ce0.9Gd0.1O2d (CGO) electrolyte have been prepared with a view to take advantage of the complimentary properties of the two extreme compositions La2NiO4+d and  Pr2NiO4+d, i.e. the superior stability of La2NiO4+d and the higher electronic  conductivity of Pr2NiO4+d. The design consists of stacking of two layers starting with
a 3D tree-like microstructure (20 mm thick) over a thin dense base layer (100 nm)  fabricated in one step by electrostatic spray deposition (ESD) and then topped by using a screen-printed (SP) current collecting layer of the same composition. X-ray diffraction confirms the formation of a complete solid solution crystallizing in a single phase orthorhombic structure with the Fmmm space group. The thermodynamic stability and polarisation resistance (Rpol) decrease by increasing the Pr content. Among the complete La2xPrxNiO4+d solid solutions, LaPrNiO4+d shows the best compromise between electrochemical properties (the lowest Rpol value available in the literature for this composition, 0.12 U cm2 at 600 C) and thermodynamic stability in air. Moreover, an anode supported single cell (Ni-3YSZ/Ni-8YSZ/8YSZ/CGO) including the LaPrNiO4+d double layer electrode shows a maximum power density of 438 mW cm2 at 700 C.Architecturally designed La2xPrxNiO4+d (with x ¼ 0, 0.5, 1 and 2) cathodes on the Ce0.9Gd0.1O2d (CGO) electrolyte have been prepared with a view to take advantage of the complimentary properties of the two extreme compositions La2NiO4+d and Pr2NiO4+d, i.e. the superior stability of La2NiO4+d and the
higher electronic conductivity of Pr2NiO4+d. The design consists of stacking of two layers starting with a 3D tree-like microstructure (20 mm thick) over a thin dense base layer (100 nm) fabricated in one step by electrostatic spray deposition (ESD) and then topped by using a screen-printed (SP) current collecting layer of the same composition. X-ray diffraction confirms the formation of a complete solid solution crystallizing in a single phase orthorhombic structure with the Fmmm space group. The thermodynamic stability and polarisation resistance (Rpol) decrease by increasing the Pr content. Among the complete La2xPrxNiO4+d solid solutions, LaPrNiO4+d shows the best compromise between electrochemical properties (the lowest Rpol value available in the literature for this composition, 0.12 U cm2 at 600 C) and thermodynamic stability in air. Moreover, an anode supported single cell (Ni-3YSZ/Ni-8YSZ/8YSZ/CGO) including the LaPrNiO4+d double layer electrode shows a maximum power density of 438 mW cm2 at 700 °C."
DOI: 10.1039/C6TA08011A
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mise à jour le 16 octobre 2019

  • Tutelle CNRS
  • Tutelle Grenoble INP
Université Grenoble Alpes