Fig. 3.
AC HAADF-STEM images of Pt SACs with different atom densities. AC HAADF-STEM images of a Pt1/N–C(1:320); b Pt1/N–C(1:80); c Pt1/N–C(1:40); and d Pt1/N–C(1: 20). SAs are highlighted by yellow circles. Scale bar, 2 nm
AC HAADF-STEM images of Pt SACs with different atom densities. AC HAADF-STEM images of a Pt1/N–C(1:320); b Pt1/N–C(1:80); c Pt1/N–C(1:40); and d Pt1/N–C(1: 20). SAs are highlighted by yellow circles. Scale bar, 2 nm