Fig. 5: Synthesis strategy and electron microscopic characterization. | Nature Communications

Fig. 5: Synthesis strategy and electron microscopic characterization.

From: Experimentally validated design principles of heteroatom-doped-graphene-supported calcium single-atom materials for non-dissociative chemisorption solid-state hydrogen storage

Fig. 5: Synthesis strategy and electron microscopic characterization.

a Synthesis route of Ca atomically dispersed on N-doped graphene substrate. (1) The introduction of N atoms. (2) The introduction of atomically dispersed Ca single atoms. (3) Freeze-dry step. b SEM image. c, d TEM image and corresponding EDS elemental mapping of N-doped-graphene-supported Ca single atoms (N-G-Ca). e, f Aberration corrected HAADF-STEM images of N-doped-graphene-supported Ca single atoms (N-G-Ca) in different scale bars. Here, yellow circles represent the labeled Ca single atoms anchored on N-G-Ca substrate. g HR-TEM image of N-doped-graphene-supported Ca single atoms (N-G-Ca).

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