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.

From: A general strategy for preparing pyrrolic-N4 type single-atom catalysts via pre-located isolated atoms

Sample

Path

CNs

R (Ã…)

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

  1. 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.
Back to article page