Fig. 18.

a Schematic description explaining the reaction mechanism of the CuO/O-doped g-C₃N₄ anode during the charge/discharge process. Reproduced with permission from Ref. [116]. Illustrations of pure (b, c) g-C₃N₄ and (d, e) Zn₂GeO₄/g-C₃N₄ hybrids for Li-insertion viewed from the (b, c) edge and (d, e) basal plan directions. Reproduced with permission from Ref. [111]. f Schematic illustration of the Li-ions diffusion and electronic transport in the SnS₂ and SnS₂/CN composite electrode during the charge/discharge processes. Reproduced with permission from Ref. [117]. Copyright permissions from Elsevier, Royal Society of Chemistry, American Chemical Society and Wiley–VCH. (Color figure online)