Table 1 The best-fitted EXAFS results of Pt1/Fe2O3-T catalystsa

From: Unraveling the coordination structure-performance relationship in Pt1/Fe2O3 single-atom catalyst

Sample

Shell

CN

R (Ã…)

σ2 (10−2 Å2)

ΔE0 (eV)

r-factor (%)

Pt Foil

Pt-Pt

12.0

2.76

0.5

4.9

0.001

PtO2

Pt-O

6.0

1.99

0.4

3.2

0.3

H2PtCl6 (liquid)

Pt-Cl

6.0

2.32

0.4

−3.7

0.02

Pt-en (liquid)

Pt-N

4.3

2.01

0.5

5.7

0.3

Pt1/FeOOH-RT

Pt-(N/O)

6.0

1.99

0.6

0.3

0.5

Pt1/Fe2O3-500

Pt-O

3.8

2.00

0.7

4.5

0.6

Pt1/Fe2O3-525

Pt-O

3.1

2.00

0.7

5.1

0.6

Pt-Fe

0.2

2.63

0.4

5

 

Pt1/Fe2O3-550

Pt-O

2.8

2.00

0.7

4.9

0.6

Pt-Fe

0.3

2.61

0.3

4.9

 

Pt1/Fe2O3-575

Pt-O

2.0

2.02

0.6

7

0.2

Pt-Fe

0.7

2.62

0.3

7

 

Pt1/Fe2O3-600

Pt-O

1.8

2.02

0.6

6.5

0.5

Pt-Fe

0.8

2.63

0.3

6.5

 
  1. aCN is the coordination number for the absorber–backscatterer pair, R is the average absorber−backscatterer distance, σ2 is the Debye−Waller factor, and ΔE0 the inner potential correction. The accuracies of the above parameters are estimated as CN, ±20%; R, ±1%; σ2, ± 20%; ΔE0, ±20%. The data range used for data fitting in k-space (Δk) and R-space (ΔR) are 3.0–10.5 Å−1 and 1.2–3.2 Å, respectively
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