Table 2. Atomic Structure Parameters of Experimental Pt-Decorated Ni@Pd NCs and Control Samples (Pt-CNT).
| Pt4+ adsorption time | NCs | bond pair | CN | R (Å) | χa |
|---|---|---|---|---|---|
| 10 s | Pt-CNT | Pt–Pt | 6.45 ± 0.4 | 2.752 ± 0.02 | 100 |
| NPP-10 s | Pt–Pt | 3.4 ± 0.8 | 2.678 ± 0.02 | 62.7 | |
| Pt–Pd | 1.1 ± 0.3 | 2.634 ± 0.02 | 20.3 | ||
| Pt–Ni | 0.92 ± 0.2 | 2.615 ± 0.02 | 17.0 | ||
| 2 h | NPP-2 h | Pt–Pt | 4.49 ± 0.4 | 2.706 ± 0.01 | 65.1 |
| Pt–Pd | 1.08 ± 0.2 | 2.635 ± 0.01 | 15.7 | ||
| Pt–Ni | 1.33 ± 0.3 | 2.582 ± 0.02 | 19.3 | ||
| 24 h | NPP-24 h | Pt–Pt | 3.65 ± 0.5 | 2.701 ± 0.02 | 60.1 |
| Pt–Pd | 1.09 ± 0.3 | 2.606 ± 0.02 | 18.0 | ||
| Pt–Ni | 1.33 ± 0.3 | 2.582 ± 0.01 | 21.9 |
a
χ stands for the extent of heteroatomic intermix for M atoms around Pt in a bond pair of Pt–M (i.e., χ for Pt–Pd refers to the extent of Pd atoms among the total coordination numbers around Pt atom. For optimization of structure parameters, σ2 is determined to be 0.004 Å2 by fitting the spectrum of Pt foil and is adopted for fitting all experimental spectra.