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Chapter 4 83<br />

Interestingly, the position of the edge jump in case of the ip-doped samples 2a-b does not<br />

change compared with that in the parent Ru-MOF (Figure 4.21). The Ru oxidation state is<br />

not affected by the incorporation of ip, which could be taken as indication of a<br />

predominance of defects B for samples 2a-b. When the functional group of the DLs<br />

changes from small, coordinative inert H to the somewhat larger and coordinative more<br />

suitable ligator-sites like -OH, -NH2 or -Br, the defects A are favored in case of relatively<br />

low doping level. However, upon rising the doping level, defects B are increasingly created<br />

along with some remaining defects A, resulting in less pronounced variation of the<br />

oxidation state of Ru in the defect-engineered samples compared with the parent material.<br />

Figure 4.22. XANES spectra (normalized absorption vs. Energy) of the Ru-DEMOF materials (1a-<br />

1d, 2a, 2b, 3a-3c and 4a) compared with the parent Ru-MOF as well as some Ru references. Solid<br />

Black: parent Ru-MOF; solid blue: a samples of the respective series 1-4; solid dark cyan: b<br />

samples of the respective series 1-4; soid magenta: c samples of the respective series 1-4; solid<br />

dark yellow: d samples of the respective series 1-4; dash dot violet: Ru; solid orange: RuO 2 ; short<br />

dash wine: Ru nano-particles(NPs).

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