Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

Horlyck, Jonathan; Nashira, Alimatun; Lovell, Emma; Daiyan, Rahman; Bedford, Nicholas; Wei, Yuexing; Amal, Rose; Scott, Jason

doi:10.3390/ma12172756

Title: Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

Journal Article · Tue Aug 27 00:00:00 EDT 2019 · Materials

DOI:https://doi.org/10.3390/ma12172756· OSTI ID:1601864

Horlyck, Jonathan ^[1]; Nashira, Alimatun ^[1]; Lovell, Emma ^[1]; Daiyan, Rahman ^[1]; Bedford, Nicholas ^[1]; Wei, Yuexing ^[2]; Amal, Rose ^[1]; Scott, Jason ^[1]

Univ. of New South Wales, Sydney, NSW (Australia)
Southeast Univ., Nanjing (China)

The generation of structural defects in metal oxide catalysts offers a potential pathway to improve performance. Herein, we investigated the effect of thermal hydrogenation and low-temperature plasma treatments on mixed SiO₂/TiO₂ materials. Hydrogenation at 500 °C resulted in the reduction of the material to produce Ti³⁺ in the bulk TiO₂. In contrast, low temperature plasma treatment for 10 or 20 min generated surface Ti³⁺ species via the removal of oxygen on both the neat and hydrogenated material. Assessing the photocatalytic activity of the materials demonstrated a 40–130% increase in the rate of formic acid oxidation after plasma treatment. A strong relationship between the Ti³⁺ content and catalyst activity was established, although a change in the Si–Ti interaction after plasma treating of the neat SiO₂/TiO₂ material was found to limit performance, and suggests that performance is not determined solely by the presence of Ti³⁺.

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

Sponsoring Organization:: USDOE Office of Science (SC); Australian Research Council

Grant/Contract Number:: AC02-06CH11357; FL140100081

OSTI ID:: 1601864

Journal Information:: Materials, Vol. 12, Issue 17; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 9 works

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36 MATERIALS SCIENCE
silica-titania photocatalysts
defect generation
plasma pre-treatment
oxygen activation

Title: Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

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