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Beilstein J. Nanotechnol. 2020, 11, 1–15, doi:10.3762/bjnano.11.1
Figure 1: Schematic synthesis overview of amorphous N-doped carbon spheres (NCSs) and graphitized N-doped car...
Figure 2: SEM images of (a) the carbon spheres with Fe2O3 before acid treatment, (b, c) the different non-gra...
Figure 3: TEM images of (a–d) the NCS catalysts and (e–h) the g-NCS catalysts. The TEM images in (a–d) are re...
Figure 4: X-ray diffraction patterns of the NCS and g-NCS catalyst series.
Figure 5: XPS data. Top: N configuration of the NCS and g-NCS catalysts; below: XPS spectra of N 1s region fo...
Figure 6: Raman spectra of the NCS and g-NCS catalysts (the x-axis represents the Raman shift relative to the...
Figure 7: N2 sorption isotherms of the (a) NCS and (b) g-NCS catalyst series.
Figure 8: ORR measurements (cyclic voltammograms). (a) ORR disc current densities of the NCS catalysts and Pt...
Figure 9: ORR onset potential (potential value at 0.1 mA·cm−2) as a function of the micropore surface area (M...
Figure 10: ORR onset potential (potential value at 0.1 mA·cm−2) as a function of the nitriding temperature of ...