Figure 3: Structure characterization of the Ni–C catalysts. | Nature Communications

Figure 3: Structure characterization of the Ni–C catalysts.

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

Figure 3

(a) XRD patterns of Ni@C, HCl-Ni@C and A-Ni–C, respectively. The diffraction peaks of Ni in Ni@C and HCl-Ni@C confirm the existence of well crystalline Ni metal. The red line corresponding to A-Ni–C illustrates that no Ni–Containing crystal phase was detected after activation process. (b) Raman spectrum of Ni@C with ID/IG=0.63, indicating the partial graphitization at 700 °C.

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