Figure 2: Micrographs of samples HCl-Ni@C and A-Ni–C. | Nature Communications

Figure 2: Micrographs of samples HCl-Ni@C and A-Ni–C.

From: Atomically isolated nickel species anchored on graphitized carbon for efficient hydrogen evolution electrocatalysis

Figure 2

(a) HRTEM image of HCl-Ni@C. Scale bar, 10 nm. Inset of a, BF STEM image of Ni metal encapsulated in graphene layers. Scale bar, 5 nm. The area of graphene with exposure of Ni nanoparticle provides the opportunity that Ni metal would slowly resolve during the activation process. (b) Subångström resolution HAADF STEM image of A-Ni–C. The circles are drawn around isolated Ni atoms. Scale bar, 3 nm. Inset of b, the size distribution figure, which is based on >120 observed Ni species counted from high-magnification images (recorded at 4 × original magnification).

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