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Fig. 4 | Nano-Micro Letters

Fig. 4

From: Ultrasonic Plasma Engineering Toward Facile Synthesis of Single-Atom M-N4/N-Doped Carbon (M = Fe, Co) as Superior Oxygen Electrocatalyst in Rechargeable Zinc–Air Batteries

Fig. 4

The local electronic state and chemical environment of Co-N4/NC. a Comparison of Co K-edge XANES spectra of Co foil, CoO, Co3O4, CoPc, and Co-N4/NC. b Fourier transform of the EXAFS spectra of Co foil, CoO, Co3O4, CoPc, and Co-N4/NC. c, d EXAFS analysis of Co-N4/NC at K and R space. The inset in d demonstrates the model derived from the EXAFS results. e Wavelet transform of Co K-edge XANES spectra of Co foil, CoO, Co3O4, CoPc, and Co-N4/NC

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