Local structure and composition of PtRh nanoparticles produced through cathodic corrosion

0506647 - ÚFCH JH 2020 RIV GB eng J - Journal Article
Hersbach, T.J.P. - Kortlever, R. - Lehtimäki, Matti - Krtil, Petr - Koper, M.T.M.
Local structure and composition of PtRh nanoparticles produced through cathodic corrosion.
Physical Chemistry Chemical Physics. Roč. 19, č. 16 (2017), s. 10301-10308. ISSN 1463-9076. E-ISSN 1463-9084
Institutional support: RVO:61388955
Keywords : ag alloy nanoparticles * oxygen reduction * au-ag * heterogeneous catalysis * metallic nanoparticles * electrocatalysts * bulk * evolution * hydrosols * ifeffit
OECD category: Physical chemistry
Impact factor: 3.906, year: 2017
Method of publishing: Open access

Alloy nanoparticles fulfill an important role in catalysis. As such, producing them in a simple and clean way is much desired. A promising alloy nanoparticle production method is cathodic corrosion, which generates particles by applying an AC voltage to an alloy electrode. However, this harsh AC potential program might affect the final elemental distribution of the nanoparticles. In this work, we address this issue by characterizing the time that is required to create 1 mu mol of Rh, Pt12Rh88, Pt55Rh45 and Pt nanoparticles under various applied potentials. The corrosion time measurements are complemented by structural characterization through transmission electron microscopy, X-ray diffraction and X-ray absorption spectroscopy. The corrosion times indicate that platinum and rhodium corrode at different rates and that the cathodic corrosion rates of the alloys are dominated by platinum. In addition, the structure-sensitive techniques reveal that the elemental distributions of the created alloy nanoparticles indeed exhibit small degrees of elemental segregation. These results indicate that the atomic alloy structure is not always preserved during cathodic corrosion.
Permanent Link: http://hdl.handle.net/11104/0297853