Preparation of a Cu-Doped Graphene Oxide–Glutamine Nanocomposite for Supercapacitor Electrode Applications: An Experimental and Theoretical Study

High-Performance Ni(II)@Amine-Functionalized Graphene Oxide Composite as Supercapacitor Electrode: Theoretical and Experimental Study

“…The wide peak at the wavenumber range of 3000–3680 cm –1 corresponds to O–H and N–H bands. , At the ranges of 2830–4000 and 2315–2400, four peaks can be observed which are attributed to C–H vibration. , Both samples also exhibit peaks related to CO, C–O, R–O–R′, −OR, and O–H bands, caused by the presence of O-containing functional groups in the GO structure, which are centered at approximate wavenumbers of 1722, 1224, 1047, 822, and 590 cm –1 . − Moreover, peaks at 1572 and 972 cm –1 are a sign of CC and C–H band presence. , New absorption bands have appeared in the FTIR spectrum of Ni@A-GO at about 1655, 1616, 1462, and 618 cm –1 . The first three are related to C–NH 2 , N–H, and N–H vibration bands which are caused by successful amine functionalization of GO using glutamine. − The last peak is evidence of the presence of Ni(II) as the Ni–O band in the synthesized composite …”