Rapid Plasma Exsolution from an A-site Deficient Perovskite Oxide at Room Temperature
Rapid Plasma Exsolution from an A-site Deficient Perovskite Oxide at Room Temperature
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DOI：
10.1002/aenm.202201131
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发表时间：
2022-10-03
影响因子：
27.8
通讯作者：
Mariotti, Davide
中科院分区：
文献类型：
--
作者：
Khalid, Hessan;ul Haq, Atta;Mariotti, Davide
高性能纳米颗粒平台可以将催化进展推向新的境界，实现环境和能源目标。纳米粒子脱溶提供了前所未有的机会，但受到当前苛刻的工艺条件的限制。揭示新的溶出途径，特别是在低温下，代表着一个重要的里程碑，它将能够改进可持续的合成路线，更好地控制催化微观结构以及新的应用机会。本文证明，室温下的等离子体直接溶出恰好代表了合成中的这种阶跃变化。此外，还确定了最影响外解过程的因素。结果表明，在氩低压低温等离子体的短暂离子轰击下，产生的表面缺陷引发了溶出。这产生了直径约为 19-22 nm 的受控纳米颗粒，具有非常高的数密度，从而创建了一种用于 CO 氧化的高活性催化材料，可与传统创建的溶出样品相媲美。
High-performance nanoparticle platforms can drive catalysis progress to new horizons, delivering environmental and energy targets. Nanoparticle exsolution offers unprecedented opportunities that are limited by current demanding process conditions. Unraveling new exsolution pathways, particularly at low-temperatures, represents an important milestone that will enable improved sustainable synthetic route, more control of catalysis microstructure as well as new application opportunities. Herein it is demonstrated that plasma direct exsolution at room temperature represents just such a step change in the synthesis. Moreover, the factors that most affect the exsolution process are identified. It is shown that the surface defects produced initiate exsolution under a brief ion bombardment of an argon low-pressure and low-temperature plasma. This results in controlled nanoparticles with diameters approximate to 19-22 nm with very high number densities thus creating a highly active catalytic material for CO oxidation which rivals traditionally created exsolved samples.