Table 1.
Structural parameters of the M1Pt1/NCNS (M=Fe, Co, and Ni), foil, and oxide references extracted from quantitative EXAFS curve-fittings at Co, Fe, and Ni K edges.
| Sample | Path | CNs | R (Å) | σ2 (10−3Å2) | ΔE0 (eV) |
|---|---|---|---|---|---|
| Co foil | Co-Co | 12.0 | 2.49 | 6.1 | 6.9 |
| Co3O4 | Co-O | 4.0 | 1.91 | 1.7 | 1.0 |
| Co1Pt1/NCNS | Co-O | 2.0 | 1.98 | 3.3 | 2.2 |
| Co-N | 4.0 | 2.08 | 6.4 | ||
| Fe foil | Fe-Fe | 8.0 | 2.46 | 5.3 | 5.3 |
| Fe-Fe | 6.0 | 2.85 | |||
| Fe2O3 | Fe-O | 6.0 | 1.93 | 10.0 | −6.0 |
| Fe1Pt1/NCNS | Fe-O | 2.2 | 1.95 | 2.0 | −4.2 |
| Fe-N | 4.2 | 2.02 | 2.9 | ||
| Ni foil | Ni-Ni | 12.0 | 2.48 | 6.1 | 7.4 |
| NiO | Ni-O | 6.0 | 2.05 | 4.2 | −3.7 |
| Ni1Pt1/NCNS | Ni-O | 2.2 | 1.99 | 1.5 | 2.1 |
| Ni-N | 4.2 | 2.11 | 2.5 |
CNs coordination numbers, R bonding distance, σ2 Debye-Waller factor, ΔE0 inner potential shift. Errors in the fitting parameters are CN ± 20%, R ± 0.02, σ2 ± 20%, and ΔE0 ± 3.0.