Table 2 EXAFS fitting parameters for sample under catalytic state with O-based adsorbates: amount of O varied from 0 to 2.

From: Probing the active site in single-atom oxygen reduction catalysts via operando X-ray and electrochemical spectroscopy

Fitting condition (@0.6 V vs. RHE)

Coordinated number CN

EXAFS R (Å)

σ2

4-coordinated (0O–CoN4)

Co–N: 35.6

1.81

0.12

5-coordinated (1O–CoN4)

Co–N: 3.98

2.02

0.0025

Co–O: 1.01

2.36

6-coordinated (2O–CoN4)

Co–N: 1.20

1.87

0.33

Co–O: 7.61

2.12

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