Fig. 2: Characterization of BNC-Cu. | Nature Communications

Fig. 2: Characterization of BNC-Cu.

From: Manipulating local coordination of copper single atom catalyst enables efficient CO2-to-CH4 conversion

Fig. 2

a–c TEM image (a), SEM image (b), and HAADF-STEM image (c) of BNC-Cu. d, e B K-edge (d), N K-edge (e) XANES spectra of BNC-Cu. The B K-edge XANES for BNC-Cu showed the spectral fingerprints of B (sp2)-N (sp2) bonds with three B 1 s → π* resonances and one 1 s → σ* resonance. The resonance of B-C bonds could also be seen. The generally-existed interaction between B and N in BNC-Cu was further identified by signals of N 1 s → π* resonance and N 1 s → σ* resonance of B-N bonds in N K-edge XANES results, π* and σ* resonances of C = N were also observed. f WT-EXAFS plots of Cu foil, NC-Cu, and BNC-Cu. g FT-EXAFS spectra at Cu K-edge of BNC-Cu, CuO, and Cu foil. h, The corresponding EXAFS fitting curves of BNC-Cu at R space. The inset of h is the schematic model of the fitting result, Cu (orange), N (blue), B (pink).

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