“…The XRD patterns of the NiFe 2 O 4 /NG/cellulose composite (Figure 1A) shows reflection planes of (220), (311), (222), (400), (422), (511), (440), and (533) located at 2θ values of 27.34°, 31.70°, 33.05°, 45.61°, 53.90°, 56.60°, 66.35°, and 75.27°, respectively, results that confirm the presence of NiFe 2 O 4 with a face‐centered cubic structure (JCPDS PDF file No. 10‐0325) 30,31 . During synthesis, GO was converted to rGO, which is confirmed by the less intense peak around 2θ = 24.11° (Figure S1 in the Supporting Information).…”