Table 1 Quantitative results of X-ray absorption spectroscopy model analysis at Pt L3-edge and Pd K-edge of Co@Pd-Pt/CNT nanocatalysts and control samples

From: Platinum-trimer decorated cobalt-palladium core-shell nanocatalyst with promising performance for oxygen reduction reaction

Sample

Pt L3-edge

Pd K-edge

 

Bond pair

CN

R

χ

Bond pair

CN

R

χ

Co@Pd-Pt

Pt-Pt

1.95

2.691

43.5%

Pd-Pd

5.88

2.762

62.3%

Pt-Pd

1.16

2.671

25.9%

Pd-Pt

2.91

2.711

30.8%

Pt-Co

1.37

2.629

30.6%

Pd-Co

0.65

2.708

6.9%

Co@Pd

    

Pd-Pd

5.51

2.731

89.9%

     

Pd-Co

0.62

2.753

10.1%

 

Pt-O

0.57

1.893

 

Pd-Pd

5.5

2.75

66.7%

Pd@Pt

Pt-Pt

4.49

2.705

75.5%

Pd-Pt

2.75

2.723

33.3%

 

Pt-Pd

1.46

2.662

24.5%

Pd-O

0.47

2.03

 

Pt/CNT

Pt-Pt

6.45

2.752

     

Pd/CNT

    

Pd-Pd

5.71

2.747

 
     

Pd-O

0.78

2.041

 
  1. CNT carbon nanotube
  2. χ represents a hetero-atomic intermix of coordination neighbors to the target atom in a selected bond pair. For the Pt L3-edge result, χM = (CNPt-M / CNPt-total) × 100%, where M represents neighboring atoms of Pt and CNPt-total = Σ CNPt-M (for instance, CNPt-total = CNPt-Pt + CNPt-Pd for the sample of Pd@Pt catalyst)
  3. R-factor is 0.04 for Co@Pd-Pt, 0.01 for Pd@Pt, 0.01 for Pt/CNT at Pt L3- edge; 0.02 for Co@Pd-Pt, 0.01 for Pd@Pt,; and 0.01 for Pd/CNT at Pd K-edge
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