期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 113, 期 52, 页码 21657-21666出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp904935e
关键词
-
资金
- Czech Republic [IAA400400906]
- European Commission [220711]
- KEK (Tsukuba, Japan) [2008P008]
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. The incorporated Ni shows it tendency to form Clusters within a rutile structure for low Ni concentration. At high Ni content, the architecture of the Ni-rich defects resembles architecture of shear planes in oxygen-deficient rutile. These Ni-rich regions likely manifest themselves on the Surface its line or plane defects, which are the most likely structural features active in the electrocatalytic processes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据