Nano-socketed nickel particles with enhanced coking resistance grown in situ by redox exsolution.
Nano-socketed nickel particles with enhanced coking resistance grown in situ by redox exsolution.
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DOI：
10.1038/ncomms9120
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发表时间：
2015-09-11
影响因子：
16.6
通讯作者：
Irvine JTS
中科院分区：
文献类型：
--
作者：
Neagu D;Oh TS;Miller DN;Ménard H;Bukhari SM;Gamble SR;Gorte RJ;Vohs JM;Irvine JTS
负载在氧化物表面上的金属颗粒被用作化学和能量转换工业中各种工艺的催化剂。对于催化应用，金属颗粒通常通过物理或化学沉积在氧化物载体上形成，或者较少通过从其出溶形成。虽然根本上不同，但可以假设这两种方法产生形态和功能相似的颗粒。在这里，我们表明，与沉积在钙钛矿氧化物上的镍颗粒不同，出溶的类似物嵌入到母体钙钛矿中，从而提高了稳定性并显着降低了烃焦化的倾向，这表明金属-氧化物界面更强。此外，我们还揭示了关键的表面效应和缺陷相互作用，这对未来设计用于催化和其他功能的基于出溶的钙钛矿材料至关重要。这项研究提供了一个新的维度定制的背景下，不断增加的兴趣出现的界面现象的颗粒-基底相互作用。 负载在氧化物表面的金属颗粒是广泛使用的催化剂，并且复合物通常通过沉积或出溶方法形成。在这里，作者表明，由于更强的金属氧化物界面，从母体钙钛矿中溶出的镍颗粒表现出增强的稳定性。
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.