Enhanced Electrochemical\nPerformances of Heterostructures\nBased on the Colloidal Association of Graphene Oxide and Titanium\nDisulfide Nanosheets

Due to the large proliferation of electrical devices\ncombined with\nthe ecological transition for carbon neutrality in various modern\ncountries, the demand for compact and efficient portable energy sources\nis continuously increasing. In this research work, we have developed\nelectrochemical energy storage heterostructures based on graphene\noxides (GOs) and titanium disulfide (TiS<sub>2</sub>) nanosheets of\ndifferent lateral sizes through a facile colloidal association thanks\nto the opposite electric charges of the two types of nanosheets. Large\nGO (LGO) served as a template system to organize TiS<sub>2</sub> nanosheets\nat different loadings, of which incorporation prevented any restacking\nof the layered graphitic structure. While large nanosheets led to\nthe decoration of TiS<sub>2</sub> aggregates including Li<sup>+</sup> cations on LGO, the association of the nanosheets of different compositions\nbut equivalent sizes drove the formation of an interstratified organization\nof the nanosheets. The singular organization within GO and TiS<sub>2</sub> nanosheets remained after a hydrothermal reduction process,\nleading to heterostructure materials with a large specific surface\narea and capacitance of 113 F/g obtained in 6 M KOH aqueous solution.\nThese outstanding electrochemical performances, drastically enhanced\nby about 41% from those of the individual reduced GO (capacitance\nof 80 F/g) used as a collector for the electric carriers, suggest\nthat the developed heterostructures present a possible application\nas electrochemical energy storage technology materials for supercapacitor\napplications.