Oxidation state of platinum (δ) and Pt L3-edge EXAFS fitting results (R, distance; CN, coordination number; σ2 Debye–Waller factor; ΔE0, inner potential correction b) of Pt–Nb2O5 samples.
| Sample | δ | Pt–O | Pt–Pt | σ 2 (Å2) | ΔE0 (eV) | ||
|---|---|---|---|---|---|---|---|
| R (Å) | CN | R (Å) | CN | ||||
| 1 Pt–Nb2O5-fresh | 1.82 ± 0.04 | 1.98 ± 0.01 | 4.1 ± 0.2 | — | — | 0.003(O)0.005 ± 0.001(Pt) | 12.1 ± 0.7 |
| 1 Pt–Nb2O5–H2 | 1.20 ± 0.02 | 2.00 ± 0.01 | 2.2 ± 0.2 | — | — | 10.2 ± 2.5 | |
| 1 Pt–Nb2O5-used | 1.01 ± 0.02 | 1.97 ± 0.01 | 1.9 ± 0.2 | 2.70 ± 0.02 | 1.8 ± 0.6 | 8.3 ± 1.4 | |
| 0.3 Pt–Nb2O5-fresh | 1.84 ± 0.02 | 1.98 ± 0.01 | 4.1 ± 0.3 | — | — | 12.1 ± 0.7 | |
| 0.3 Pt–Nb2O5–H2 | 1.13 ± 0.02 | 2.00 ± 0.02 | 2.3 ± 0.5 | — | — | 10.2 ± 2.5 | |
| 0.3 Pt–Nb2O5-used | 0.72 ± 0.02 | 1.97 ± 0.01 | 1.7 ± 0.3 | 2.74 ± 0.01 | 4.9 ± 1.2 | 8.3 ± 1.4 | |