Aliovalent Doping of CeO2 Improves the Stability of Atomically Dispersed Pt,ACS Applied Materials & Interfaces

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Aliovalent Doping of CeO2 Improves the Stability of Atomically Dispersed Pt
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-10-29 , DOI: 10.1021/acsami.1c18330
Haodong Wang ₁ , Matthew Kottwitz ₂ , Ning Rui ₃ , Sanjaya D Senanayake ₃ , Nebojsa Marinkovic ₄ , Yuanyuan Li ₁ , Ralph G Nuzzo _{2,

5} , Anatoly I Frenkel _{1,

3}

Affiliation

Atomically dispersed supported catalysts hold considerable promise as catalytic materials. The ability to employ and stabilize them against aggregation in complex process environments remains a key challenge to the elusive goal of 100% atom utilization in catalysis. Herein, using a Gd-doped ceria support for atomically dispersed surface Pt atoms, we establish how the combined effects of aliovalent doping and oxygen vacancy generation provide dynamic mechanisms that serve to enhance the stability of supported single-atom configurations. Using correlated, in situ X-ray absorption, photoelectron, and vibrational spectroscopy methods for the analysis of samples on the two types of support (with and without Gd doping), we establish that the Pt atoms are located proximal to Gd dopants, forming a speciation that serves to enhance the thermal stability of Pt atoms against aggregation.

中文翻译：

CeO2 的异价掺杂提高了原子分散 Pt 的稳定性

原子分散的负载型催化剂作为催化材料具有相当大的前景。在复杂的过程环境中使用和稳定它们以防止聚集的能力仍然是实现 100% 催化原子利用率这一难以实现的目标的关键挑战。在此，我们使用 Gd 掺杂的氧化铈支持原子分散的表面 Pt 原子，我们确定了异价掺杂和氧空位生成的组合效应如何提供动态机制，用于增强支持的单原子配置的稳定性。使用相关的原位 X 射线吸收、光电子和振动光谱方法分析两种类型的载体（有和没有 Gd 掺杂）上的样品，我们确定 Pt 原子位于 Gd 掺杂剂的近端，

更新日期：2021-11-10

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