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. 2016 Feb 10;7:10667. doi: 10.1038/ncomms10667

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

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.