*3.2. IF-WS2/Graphene Hybrids*

The generation of graphene was performed in all cases starting from graphite flakes, which were oxidized to form graphite oxide (GO) following a modification of the process developed by Marcano *et al*. [68]. The GO was then used either as (i) dispersion with WO3 nanoparticles and then exfoliated at high temperature with urea as expansion-reducing agent (to generate Graphene/WO3) followed by a sulfurization step using H2S atmosphere (to obtain Graphene/IF-WS2) or (ii) exfoliated at high temperature with urea to form graphene, which was then mixed with WO3 and the mixture sulfurized (this step rendered Graphene/IF-WS2). The processes described are depicted in Figure 11.

**Figure 11.** Synthesis protocol followed to generate Graphene/IF-WS2 hybrids from GO*.* Initial precursors (graphite flakes, acids and oxidant) will render graphite oxide. Protocols followed after GO generation (**i**) mixture of GO with WO3 followed by exfoliation and sulfurization and (**ii**) Production of graphene through GO thermal exfoliation, mixture with WO3 and sulfurization of mixture.
