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Hybrid 2D-2D materials composed by perpendicularly oriented covalent organicframework (COFs) and graphene were prepared and tested for energy storageapplications. Diboronic acid molecules covalently attached to graphene oxide(GO) were used as nucleation sites for directing vertical growth of COF-1nanosheets (v-COF-GO). The hybrid material shows forest of COF-1 nanosheetswith thickness of ~3 to 15 nm in edge-on orientation relative to GO. The samereaction performed in absence of molecular pillars resulted in uncontrollablegrowth of thick COF-1 platelets parallel to the surface of GO. The v-COF-GO wasconverted into conductive carbon material preserving the nanostructure ofprecursor with ultrathin porous carbon nanosheets grafted to graphene inedge-on orientation. It was demonstrated as high-performance electrode materialfor supercapacitors. The molecular pillar approach can be used for preparationof many other 2D-2D materials with control of their relative orientation.

Molecular pillar approach to grow vertical covalent organic framework nanosheets on graphene: new hybrid materials for energy storage