Highly dispersed nanoalloys with a tailored metal–oxide interface are pivotal in developing advanced catalysts with superior performance for applications. Herein, a series of highly dispersed Pt/NiFeAl nanoalloys on amorphous supports were successfully fabricated by a topological transformation of layered-double-hydroxide nanosheets. With increasing reduction temperature, samples Pt/NiFeAl-x (x = reduction temperature) showed a progressive transformation from Pt/NiFeAl-LDH to a mixture (Pt, NiFe alloys, FeO_y, and NiO_y) supported on amorphous Al₂O₃, which eventually transformed to atomically dispersed PtNiFe alloys supported on amorphous Al₂O₃. Systematic sample characterization demonstrates that amorphous alumina-supported PtNiFe nanoalloys are merited by excellent redox ability, outstanding O₂ activation ability, and moderate CO adsorption strength. When tested as catalysts for CO oxidation, all samples have demonstrated an apparent interfacial effect on catalytic performance, among which Pt/NiFeAl-600 shows a strikingly high CO oxidation activity at low-temperatures coupled with a broader operation temperature window (i.e. CO conversion >99.0%, 100–400 °C). Such a topological transformation strategy has proven applicable for generating atomically dispersed nanoalloys on amorphous supports for catalytic applications.

中文翻译：

---

从LDH纳米片到高分散PtNiFe纳米合金的拓扑转换，可增强CO氧化性能。

具有量身定制的金属-氧化物界面的高度分散的纳米合金在开发具有卓越应用性能的先进催化剂方面至关重要。本文中，通过层状双氢氧化物纳米片的拓扑转化成功地在无定形载体上制备了一系列高度分散的Pt / NiFeAl纳米合金。随着还原温度的升高，样品Pt / NiFeAl- x（x =还原温度）显示出从Pt / NiFeAl-LDH逐渐转变为负载在非晶Al ₂ O ₃上的混合物（Pt，NiFe合金，FeO _y和NiO _y）的趋势。最终转变为负载在无定形Al ₂ O ₃上的原子分散的PtNiFe合金。系统的样品表征表明，非晶态氧化铝负载的PtNiFe纳米合金具有优异的氧化还原能力，出色的O ₂活化能力和适度的CO吸附强度。当作为CO氧化的催化剂进行测试时，所有样品均表现出对催化性能的明显界面影响，其中Pt / NiFeAl-600在低温下表现出惊人的高CO氧化活性，并具有更宽的工作温度范围（即CO转化> 99.0％，100–400°C）。事实证明，这种拓扑转换策略可用于在非晶态载体上生成原子分散的纳米合金，以进行催化应用。