Fig. 4: In situ XAFS and SRIR characterizations. | Nature Communications

Fig. 4: In situ XAFS and SRIR characterizations.

From: In situ modulating coordination fields of single-atom cobalt catalyst for enhanced oxygen reduction reaction

Fig. 4

a The curve-fitting analysis of EXAFS spectra and b XANES spectra of Co K-edge recorded at different applied potentials during the ORR process for CR-Co/ClNC. Inset, magnified white-line peak region. c The fitted average formal d-band electron counts of Co at CR-Co/ClNC under ex situ, 1.00 V, and 0.90 V conditions based on the absorption edge of Co K-edge XANES spectra. The error bars are the standard deviations of three replicate calculation. In situ SRIR measurements under various potentials for (d) CR-Co/ClNC and (e) Co/NC. f ORR schematics of CR-Co/ClNC.

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