fig7

Figure 7. (A) Hard-template fabrication method, (B) charge/discharge curves, (C) cyclic performance at 0.1 A/g and (D) SEM of tubular CuO/CoO core/shell arrays on Cu foam. This figure is quoted with permission from Ref.^[66] Copyright 2015 Elsevier. (E) Field emission scanning electron microscopy (FESEM), (F) charge/discharge curves for 1st, 3rd, 50th and 100th cycles, and (G) cycling performance of NiCo₂O₄/NiO-HD at 0.2 A/g. This figure is quoted with permission from Ref.^[32] Copyright 2015 the Royal Society of Chemistry. (H) charge/discharge curves of 1st, 2nd and 100th cycles at 1.0 A/g, and (I) FESEM of NiCo₂O₄. Reproduced with permission from Ref.^[68] Copyright 2016 Elsevier.