Fig. 4. (a) An illustration of the synthetic procedure for Co@Pc/C; (b) TEM image; (c) size distribution histogram; (d) high-magnification TEM image; and the corresponding (e) fast Fourier-transform (FFT) pattern; (f) STEM-EDS elemental mapping images; and (h) Raman spectra of Co₃O₄@Pc/C alongside commercial CoPc and Pc; (i) high-resolution Co 2p XPS spectra of Co₃O₄@Pc/C and Co₃O₄/C. (j) High-resolution N 1s XPS spectra of Co₃O₄@Pc/C and Pc/C.¹¹⁸ Copyright 2020 Wiley-VCH.