Fig. 1. (a) Raman shift spectra, (b) XRD patterns (# refers to
rGO crystalline signals, * refers to Ni(OH)2 crystalline
signals) and (c) FT-IR spectra of electrode materials.
In the EDS spectrum (Fig. 2(g)) of Ni-rGO, as expected, there is a Ni
atom in the structure accompanied by C and O. Although
Ni(NO3)2 was used as the reactant at the
beginning of the reaction, the absence of the signal of the N atom in
the spectrum indicates that the starting material is fully reacted, and
as a result of this process, oxide/hydroxide derivatives of Ni are
eventually formed.