Abundance and Speciation of Surface Oxygen on Nanosized Platinum Catalysts and Effect on Catalytic Activity

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dc.contributor.authorSerra-Maia, Ruien
dc.contributor.authorWinkler, Christopheren
dc.contributor.authorMurayama, Mitsuhiroen
dc.contributor.authorTranhuu, Kevinen
dc.contributor.authorMichel, F. Marcen
dc.contributor.departmentGeosciencesen
dc.contributor.departmentInstitute for Critical Technology and Applied Scienceen
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2019-02-04T17:33:56Zen
dc.date.available2019-02-04T17:33:56Zen
dc.date.issued2018-06-18en
dc.date.updated2019-02-04T17:33:54Zen
dc.description.abstractOxygen at the surface of nanosized platinum has a direct effect on catalytic activity of oxidation−reduction chemical reactions. However, the abundance and speciation of oxygen remain uncertain for platinum with different particle size and shape characteristics, which has hindered the development of fundamental property−activity relationships. We have characterized two commercially available platinum nanocatalysts known as Pt black and Pt nanopowder to evaluate the effects of synthesis and heating conditions on the physical and surface chemical properties, as well as on catalytic activity. Characterization using complementary electron microscopy, X-ray scattering, and spectroscopic methods showed that the larger average crystallite size of Pt nanopowder (23 nm) compared to Pt black (11 nm) corresponds with a 70% greater surface oxygen concentration. Heating the samples in air resulted in an increase in surface oxygen concentration for both nanocatalysts. Surface oxygen associated with platinum is in the form of chemisorbed oxygen, and no significant amounts of chemically bonded platinum oxide were found for any of the samples. The increase in surface oxygen abundance during heating depends on the initial size and surface oxygen content. Hydrogen peroxide decomposition rate measurements showed that larger particle size and higher surface chemisorbed oxygen correlate with enhanced catalytic activity. These results are particularly important for future studies that aim to relate the properties of platinum, or other metal nanocatalysts, with surface reactivity.en
dc.description.versionPublished versionen
dc.format.extentPages 3255-3266en
dc.identifier.doihttps://doi.org/10.1021/acsaem.8b00474en
dc.identifier.eissn2574-0962en
dc.identifier.issn2574-0962en
dc.identifier.orcidMichel, Frederick [0000-0003-2817-980X]en
dc.identifier.urihttp://hdl.handle.net/10919/87426en
dc.identifier.volume1en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.titleAbundance and Speciation of Surface Oxygen on Nanosized Platinum Catalysts and Effect on Catalytic Activityen
dc.title.serialACS Applied Energy Materialsen
dc.typeArticle - Refereeden
dc.type.otherArticleen
dcterms.dateAccepted2018-06-04en
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/Geosciencesen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen
pubs.organisational-group/Virginia Tech/University Research Institutes/Fralin Life Sciences/Fralin Affiliated Facultyen
pubs.organisational-group/Virginia Tech/University Research Institutes/Fralin Life Sciencesen
pubs.organisational-group/Virginia Tech/University Research Institutesen

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