fig3

Figure 3. (A-C) TEM images of graphene, graphene-CNT, and graphene-C60. Reproduced with permission^[85]. Copyright 2008, American Chemical Society; (D) Ragone plot of pre-lithiated graphene//AC. Reproduced with permission^[105]. Copyright 2014, Elsevier B.V.; (E-G) SEM, (H) TEM, (I) HR-TEM images of SG-1000; (J) Formation of spiral graphene; (K) Raman spectra of SG-1000. Reproduced with permission^[106]. Copyright 2021, Elsevier B.V.; (L) The roles of MgO in forming few-layered graphene. Reproduced with permission^[107]. Copyright 2016, WILEY-VCH; (M) Cyclic stability of NHCN//SHSG. Reproduced with permission^[108]. Copyright 2018, Elsevier B.V.