Aliovalent Doping of CeO2 Improves the Stability of Atomically Dispersed Pt

Autor:	Haodong Wang, Ralph G. Nuzzo, Matthew Kottwitz, Nebojsa Marinkovic, Yuanyuan Li, Sanjaya D. Senanayake, Anatoly I. Frenkel, Ning Rui
Rok vydání:	2021
Předmět:	Materials science Chemical engineering Dopant Atom Doping Infrared spectroscopy General Materials Science Thermal stability Absorption (chemistry) Oxygen vacancy Catalysis
Zdroj:	ACS Applied Materials & Interfaces. 13:52736-52742
ISSN:	1944-8252 1944-8244
DOI:	10.1021/acsami.1c18330
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e289a0942877ec01fbb40c579fab13d1 https://doi.org/10.1021/acsami.1c18330 Zobrazit plný text záznamu