Fig. 2
From: Anchoring zero valence single atoms of nickel and iron on graphdiyne for hydrogen evolution
HAADF-STEM images of Ni/GD and Fe/GD. a–c Examination of various regions reveal that only isolated Ni atoms (white dots) are present and uniformly dispersed on the GD. Scale bars, 5 nm. d–f Corresponding enlargement of the marked regions in a–c. Scale bars, 1 nm. g–i Examination of various regions reveal that only isolated Fe atoms (white dots) are present and uniformly dispersed on the GD. Scale bars, 5 nm. j–l Corresponding enlargement of the marked regions in g–i. Scale bars, 1 nm
