Exsolution of Ni Nanoparticles from A-Site-Deficient Layered Double Perovskites for Dry Reforming of Methane and as an Anode Material for a Solid Oxide Fuel Cell - Université de Rennes Accéder directement au contenu
Article Dans Une Revue ACS Applied Materials & Interfaces Année : 2021

Exsolution of Ni Nanoparticles from A-Site-Deficient Layered Double Perovskites for Dry Reforming of Methane and as an Anode Material for a Solid Oxide Fuel Cell

Résumé

Exsolution is a promising technique to design metal nanoparticles for electrocatalysis and renewable energy. In this work, Ni-doped perovskites, (PrBa)MnNiO with = 0, 0.05, 0.1, and 0.2 (S-PBMNx), were prepared to design exsolution systems as solid oxide fuel cell anodes and for catalysis applications. X-ray diffraction and transmission electron microscopy (TEM) analyses demonstrated that correlating A-site deficiency with Ni content can effectively induce exsolution of all Ni under H atmosphere at ∼ 875 °C, yielding the reduced (exsolved) R-PBMNx materials. On heating the exsolution systems in air, metal incorporation in the oxide lattice did not occur; instead, the Ni nanoparticles oxidized to NiO on the layered perovskite surface. The lowest area-specific resistance (ASR) under wet 5% H/N in symmetrical cells was observed for -PBMN0.2 anode (ASR ∼ 0.64 Ω cm at 850 °C) due to the highest Ni particle density in the -PBMNx series. The best performance for dry reforming of methane (DRM) was also obtained for -PBMN0.2, with CH and CO conversion rates at 11 and 32%, respectively, and the highest production of H (37%). The DRM activity of -PBMN0.2 starts at 800 °C and is sustained for up to at least 5 h operation with little carbon deposition (0.017 g·gcat·h). These results clearly demonstrate that varying Ni-doping in layered double perovskite oxides is an effective strategy to manipulate the electrochemical performance and catalytic activity for energy conversion purposes.
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Dates et versions

hal-03333672 , version 1 (07-10-2021)

Identifiants

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Praveen B Managutti, Simon Tymen, Xiu Liu, Olivier Hernandez, Carmelo Prestipino, et al.. Exsolution of Ni Nanoparticles from A-Site-Deficient Layered Double Perovskites for Dry Reforming of Methane and as an Anode Material for a Solid Oxide Fuel Cell. ACS Applied Materials & Interfaces, 2021, 13 (30), pp.35719-35728. ⟨10.1021/acsami.1c08158⟩. ⟨hal-03333672⟩
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