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. 2021 Aug 9;11(8):2029. doi: 10.3390/nano11082029

Figure 2.

Figure 2

Fabrication of Co-SAS/HOPNC catalyst. (A) Step-wise synthesis procedure of Co-SAS/HOPNC. (B) SEM image, and (C) TEM micrograph of Co-SAS/HOPNC catalyst. (D) N2 adsorption–desorption isotherm curves of Co-SAS/HOPNC catalyst. (Inset) The pore size distribution curve. (E) HAADF-STEM micrograph and the EDS maps of Co-SAS/HOPNC catalyst. (F,G) AC HAADF-STEM micrographs of the Co-SAS/HOPNC catalyst. Yellow circles represent the isolated single Co atoms. Reproduced from [119], with permission from PNAS, 2018.