Dispersion and stability mechanism of Pt nanoparticles on transition-metal oxides

Jeong, Eun-Suk; Hwang, In-Hui; Han, Sang-Wook

doi:10.1038/s41598-022-17638-6

Dispersion and stability mechanism of Pt nanoparticles on transition-metal oxides

Journal Article · Thu Aug 11 00:00:00 EDT 2022 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-022-17638-6· OSTI ID:2469506

Jeong, Eun-Suk ^[1]; Hwang, In-Hui ^[2]; Han, Sang-Wook ^[1]

Jeonbuk National University, Jeonju (Korea, Republic of)
Argonne National Laboratory (ANL), Argonne, IL (United States)

The heterogeneous catalysts of Pt/transition-metal oxides are typically synthesized through calcination at 500 °C, and Pt nanoparticles are uniformly and highly dispersed when hydrogen peroxide (H₂O₂) is applied before calcination. The influence of H₂O₂ on the dispersion and the stability of Pt nanoparticles on titania-incorporated fumed silica (Pt/Ti–FS) supports was examined using X-ray absorption fine structure (XAFS) measurements at the Pt L₃ and Ti K edges as well as density functional theory (DFT) calculations. The local structural and chemical properties around Pt and Ti atoms of Pt/Ti–FS with and without H₂O₂ treatment were monitored using in-situ XAFS during heating from room temperature to 500 °C. XAFS revealed that the Pt nanoparticles of H₂O₂-Pt/Ti–FS are highly stable and that the Ti atoms of H₂O₂-Pt/Ti–FS support form into a distorted-anatase TiO₂. DFT calculations showed that Pt atoms bond more stably to oxidized–TiO₂ surfaces than they do to bare- and reduced–TiO₂ surfaces. XAFS measurements and DFT calculations clarified that the presence of extra oxygen atoms due to the H₂O₂ treatment plays a critical role in the strong bonding of Pt atoms to TiO₂ surfaces.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Research Foundation of Korea (NRF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2469506

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 12; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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