Figure 17.

Illustration of the formation of hybrid materials with CNT grown in between graphene nanosheets, showing stacked layers of graphene oxide with Co catalyst particles adhered onto the layer surface after deposition (white points) and CNT in between graphene layers after growth (black tubes) (a). SEM images (b) and transmission electron microscopy (TEM) image of Co-rGO-CNT (c). CV results measured at scan rates of 10, 20, 50, and 100 mV/s (d). GCD curves of composite electrode at various current densities (5–50 mA/cm²) in KOH solution (e) (Reproduced with permission of [45]. Copyright Wiley, 2010).