In Situ Neutron Scattering Studies on the Oxidation and Reduction of CeO2 and Pt–CeO2 Nanorods

Paladugu, Sreya; Metz, Peter C.; Luo, Si; Li, Meijun; Liu, Jue; Meyer III, Harry; Wu, Yiqing; Wu, Zili; Page, Katharine

doi:10.1021/acs.jpcc.2c07398

Title: In Situ Neutron Scattering Studies on the Oxidation and Reduction of CeO₂ and Pt–CeO₂ Nanorods

Journal Article · Tue Feb 14 00:00:00 EST 2023 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.2c07398· OSTI ID:1995660

Paladugu, Sreya ^[1];

^[2];

^[2]; Wu, Yiqing ^[2];

^[2];

^[1]

Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The oxygen vacancy structure of ceria plays a key role in its performance as a favored material for catalysis applications. Here, in this work, we develop an understanding of the effects of Pt loading on the structural evolution of ceria nanorods under redox gas environments that mimic real automotive catalytic converters. In situ neutron scattering studies under redox flow reveal that both CeO₂ and Pt–CeO₂ nanorods share a bulk fluorite structure with the presence of surface Frenkel-type oxygen defects. However, Pt–CeO₂ nanorods are more easily reducible than CeO₂ rods as evidenced by an increased concentration of Ce³⁺, determined by NAP-XPS. Importantly, this work finds no evidence of oxygen vacancy ordered surface reconstruction which has been reported in earlier ex situ investigations. Thus, this work highlights the discrepancy between ex situ and in situ structural observations and emphasizes the need for robust in situ investigations of catalysts to develop industrially relevant materials.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0012577

OSTI ID:: 1995660

Journal Information:: Journal of Physical Chemistry. C, Vol. 127, Issue 7; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
defects
nanorods
oxides
oxygen
platinum

Title: In Situ Neutron Scattering Studies on the Oxidation and Reduction of CeO2 and Pt–CeO2 Nanorods

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References (55)

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Title: In Situ Neutron Scattering Studies on the Oxidation and Reduction of CeO₂ and Pt–CeO₂ Nanorods