Table 1. Best fit parameters obtained from the analysis of the Ru K-edge EXAFS spectraa.
| Materials | Shell | Fitting range Δr [Å] | CN | R [Å] | ΔE0 [eV] | R factor (%) |
|---|---|---|---|---|---|---|
| 3.0%Ru-OMSC | Ru-Ru | 0.897–2.718 | 4.9 ± 1.0 | 2.65 ± 0.016 | −5.9 ± 2.4 | 4.6 |
| 3.0%Ru-OMC | Ru-O | 0.552–2.053 | 3.3 ± 0.2 | 2.01 ± 0.011 | 8.4 ± 1.2 | 0.9 |
| Ru-Ru | 0.552–3.352 | 1.8 ± 0.2 | 2.70 ± 0.011 | 5.5 ± 1.4 | - | |
| Ru foil | Ru-Ru | - | 12 | 2.67 | - |
aCN = coordination number, R = coordination distance and ΔE0 = inner potential correction. Error bounds (accuracies) that characterize the structural parameters obtained by EXAFS spectroscopy were estimated as CN, ±20%; R, ±1%; ΔE0, ±20%. Ru foil parameter from data_9008513-ICSD; RuO2 parameter from data_1000058-ICSD; r space fit, Δk = 2.8–10.0 Å−1, Δr = 0.5–3.3 Å, S02 fitting from RuO2 foil defined as 0.95.