Nano-socketed nickel particles with enhanced coking resistance grown in situ by redox exsolution
By D. Neagu, T. Oh, David N. Miller, H. Ménard, Syed M. Bukhari, S. Gamble, R. Gorte, J. Vohs, J. Irvine. Nature Communications, 2015
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Metal particles supported on oxide surfaces are used as catalysts for a wide variety of processes in the chemical and energy conversion industries. For catalytic applications, metal particles are generally formed on an oxide support by physical or chemical deposition, or less commonly by exsolution from it. Although fundamentally different, both methods might be assumed to produce morphologically and functionally similar particles. Here we show that unlike nickel particles deposited on perovskite oxides, exsolved analogues are socketed into the parent perovskite, leading to enhanced stability and a significant decrease in the propensity for hydrocarbon coking, indicative of a stronger metal–oxide interface. In addition, we reveal key surface effects and defect interactions critical for future design of exsolution-based perovskite materials for catalytic and other functionalities. This study provides a new dimension for tailoring particle–substrate interactions in the context of increasing interest for emergent interfacial phenomena. Metal particles supported on oxide surfaces are widely used catalysts, and the composites are generally formed by deposition or exsolution methods. Here, the authors show that nickel particles exsolved from the parent perovskite exhibit enhanced stability due to a stronger metal–oxide interface.
Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/6d68e581ca3b3491e7f4d77ad057f2b9e93c5e85
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In Electronic, Optical and Magnetic Materials
In Materials Chemistry
Citations in the corpus
- Reversible solid-oxide cells for clean and sustainable energy (2019, background): “Other interesting mitigation strategies are doping with more carbon-tolerant metals [88, 91, 95, 96], passivation with sulphur [83, 97], exsolution of the Ni particles [98], flowing excess oxidizing gas [99] or applying a positive bias [99], as mentioned earlier.”