Review Article

Three-Dimensional Graphene-Based Nanomaterials as Electrocatalysts for Oxygen Reduction Reaction

Figure 3

UV-vis absorption spectra and corresponding photographs (inset) of aqueous dispersions of g-C3N4 nanosheets (a), GO (b), g-C3N4/GO (c), and g-C3N4/rGO (reprinted from [44]; copyright 2014 American Chemical Society).