Table 1 XAFS fitting parameters of Pt species in Pt/meso_S-C and reference materials.

N, coordination number for the absorber-backscatterer pair; R, the average absorber-backscatterer distance; σ2, the Debye-Waller factor; ΔE0 is the inner potential correction; r factor shows the goodness of the fit. The k range for Fourier transformation was from 2.5 to 12.4 Å−1 and the fitted R range was from 1.1 to 3.2 Å.

SampleShellNR (Å)σ2 (10−3 Å2)ΔE0 (eV)r factor
Pt foilPt-Pt12 (fixed)2.763 ± 0.0034.5 ± 0.46.90 ± 0.430.002
PtO2Pt-O6 (fixed)1.987 ± 0.0094.1 ± 0.78.1 ± 1.20.024
Pt-Pt6 (fixed)3.102 ± 0.0072.9 ± 0.59.9 ± 0.2
5Pt/meso_S-CPt-S3.6 ± 0.32.270 ± 0.0073.4 ± 0.73.06 ± 0.460.007
10Pt/meso_S-CPt-S3.6 ± 0.32.264 ± 0.0073.4 ± 0.73.06 ± 0.460.004
20Pt/meso_S-CPt-S2.8 ± 0.32.261 ± 0.0085.2 ± 0.93.06 ± 0.460.002
Pt-Pt2.3 ± 0.72.717 ± 0.0369.3 ± 2.46.90 ± 0.43
30Pt/meso_S-CPt-S2.2 ± 0.22.267 ± 0.0076.1 ± 0.83.06 ± 0.460.003
Pt-Pt4.4 ± 0.62.734 ± 0.0058.8 ± 0.96.90 ± 0.43