Nanoparticle Ex-solution for Supported Catalysts: Materials Design, Mechanism and Future Perspectives

Abstract

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Exploring the Stability of Fe–Ni Alloy Nanoparticles Exsolved from Double-Layered Perovskites for Dry Reforming of Methane

“…Since the nanoparticles grow from inside, in contrast to the deposited particles, they remain anchored to the oxide surface, which provides high stability against sintering and In order to overcome these challenges, several alternatives have been pursued to obtain more stable metallic catalysts and supports. One method that has attracted attention in the past few years is nanoparticle exsolution due to the high stability that it confers to the metallic catalyst and the strong interaction with the support [2,[4][5][6]. Exsolution consists of the creation of nanoparticles by the migration, under a reductive atmosphere, of cations contained in the bulk of the oxide support that nucleate and grow in the surface.…”

“…Since the nanoparticles grow from inside, in contrast to the deposited particles, they remain anchored to the oxide surface, which provides high stability against sintering and coking (Figure 1) [7]. Most works have been focused on nanoparticle exsolution on perovskites [2,4,5], although lately, exsolution has also been observed on other oxides like in fluorite structures [8,9]. Perovskites, of the ABO3 formula (with A = La, Sr, Ca, Ba, and B, a transition metal cation) have been widely explored as catalysts for DMR based on their…”

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

“…Enhancements in both kinetics and stability by catalyst exsolution have been demonstrated in solid oxide electrochemical cells, thermochemical redox processes, and heterogeneous catalysis. [144,145] This novel technique can also be used to decorate the membrane surfaces with exsolved nanoparticles and hence, to facilitate the CO 2 reduction rates, as demonstrated experimentally in La 0.85 Ca 0.10 Fe 0.95 Ni 0.05 O 3-δ membranes. [146] Further studies are needed to construct detailed microkinetics of CO 2 reduction on membrane surfaces, to enable the development of high-fidelity reactor model for design optimization.…”

Self-assembled nano-composite perovskites as highly efficient and robust hybrid cathodes for solid oxide fuel cells

“…Indeed, when materials with different functionalities come into contact, synergistic enhancement of catalysis is oen observed. [1][2][3][4] Examples can be found with CO oxidation on Pt-CeO 2 , 5 hydrogen evolution on Li + -Ni(OH) 2 -Pt 6 and dry methane reforming on NiFe-La 0.6 Sr 0.2 Ti 0.85 Ni 0.15 O 2.95 perovskite oxides, 7 among others. A phrase attributed to Aristotle, "the whole is greater than the sum of its parts", might best suit such conditions.…”