Article
Free-Carbon Surface for PtCu Nanoparticles: An in Situ near Ambient Pressure X-ray Photoelectron Spectroscopy Study
Author/s | Castillo, Rafael
Navarro Jaén, Sara Romero Sarria, Francisca ![]() ![]() ![]() ![]() ![]() ![]() Pérez Dieste, Virginia Escudero, Carlos Centeno Gallego, Miguel Ángel Daturi, Marco Odriozola Gordón, José Antonio ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Department | Universidad de Sevilla. Departamento de Química Inorgánica |
Publication Date | 2020 |
Deposit Date | 2023-02-27 |
Published in |
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Abstract | Usually, nanoparticle synthesis methodologies require the use of organic molecules (capping agent, solvent molecules, etc.), which results in carbon deposits on the nanoparticle surface. These residues modify the surface ... Usually, nanoparticle synthesis methodologies require the use of organic molecules (capping agent, solvent molecules, etc.), which results in carbon deposits on the nanoparticle surface. These residues modify the surface properties mainly affecting the catalytic behavior. In this work, unsupported poly(vinylpyrrolidone) (PVP)-stabilized PtCu (1:3 molar ratio) bimetallic alloy nanoparticles were synthetized and characterized. An alternative surface cleaning method has been designed, which successfully removes the presence of organic fragments. To address this key issue, we have combined a first nanoparticle washing step with a near ambient pressure X-ray photoelectron spectroscopy (NAPXPS) study in order to obtain a clean active site and the total understanding of the carbon elimination mechanism. The dynamic evolution of the surface organic species composition under different gas mixtures at 750 mTorr and 350 °C has been studied, and only under CO2 exposure, NAPXPS analysis revealed a total availability of the active site by the removal of the organic nanoparticle coating. |
Funding agencies | Ministerio de Economía y Competitividad (MINECO). España Gobierno de España |
Project ID. | ENE2015-66975-C3-2-R
![]() MAT2012-38567-C02-02 ![]() |
Citation | Castillo, R., Navarro Jaén, S., Romero Sarria, F., Pérez Dieste, V., Escudero, C., Centeno, M.Á.,...,Odriozola Gordón, J.A. (2020). Free-Carbon Surface for PtCu Nanoparticles: An in Situ near Ambient Pressure X-ray Photoelectron Spectroscopy Study. Journal of Physical Chemistry C, 124 (35), 19046-19056. https://doi.org/10.1021/acs.jpcc.0c04713. |
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