Local Structure of Nanocrystalline Ru1-xNixO2-delta Dioxide and Its Implications for Electrocatalytic Behavior-An XPS and XAS Study

0340654 - ÚFCH JH 2010 RIV US eng J - Journal Article
Petrykin, Valery - Bastl, Zdeněk - Franc, Jiří - Macounová, Kateřina - Makarova, Marina - Mukerjee, S. - Ramaswamy, N. - Spirovová, Ilona - Krtil, Petr
Local Structure of Nanocrystalline Ru1-xNixO2-delta Dioxide and Its Implications for Electrocatalytic Behavior-An XPS and XAS Study.
Journal of Physical Chemistry C. Roč. 113, č. 52 (2009), s. 21657-21666. ISSN 1932-7447. E-ISSN 1932-7455
R&D Projects: GA AV ČR IAA400400906
Institutional research plan: CEZ:AV0Z40400503
Keywords : oxygen evolution reaction * nanocrystalline * XPS study
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 4.224, year: 2009

Chemical composition, crystal structure, as well as short-range atomic arrangement of nanocrystalline Ru1-xNixO2-delta oxides with x ranging between 0 and 0.3 were studied using energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS). The prepared materials form single-phase nanocrystals with rutile structure. Regardless of the chemical composition, the surface of Ru1-xNixO2-delta oxides is Ni-enriched with respect to overall chemical composition. According to both XPS and XANES, the oxidation state of Ru remains +4 in the studied materials. Ni ions are present in both divalent and trivalent states with the fraction of trivalent ions decreasing with increasing Ni content. The refinement of local structure using EXAFS data based on Ru-K and Ni-K edge absorption spectra shows that Ru preserves local arrangement characteristic for ruthenium dioxide.
Permanent Link: http://hdl.handle.net/11104/0183857