A novel composite with imine-linked covalent organic frameworks on graphene was synthesized in one step with the amine functionalized reduced graphene oxide as the support. The excellent electrochemical properties of this composite can be ascribed to the synergistic effect of the introduction of covalent organic frameworks as well-dispersed nanoscale deposits on the conductive graphene surfaces.Driven by environmental problems and the energy crisis, the development of clean and renewable energy storage materials as well as their devices is urgently needed. 1 Among various energy storage devices, rechargeable batteries and electrochemical capacitors (ECs) are regarded typically as a suitable choice to store energy by transforming chemical energy into electrical energy. 2 Electrochemical capacitors, also called supercapacitors, which store energy using either ion adsorption or fast surface redox reactions, are supposed to be promising candidates for alternative electrical energy storage devices due to their high power density, exceptional cycle life, and low maintenance cost. 3 The performance of supercapacitors is highly dependent on the properties of electrode materials. Many materials have been investigated as the electrode materials in supercapacitors, including carbonaceous materials, transition metal oxides and conducting polymers. 4 Each type of electrode material has its pros and cons. The novel electrode materials with terric performance should be developed.Covalent organic frameworks (COFs) are a novel class of crystalline organic materials with well-dened and predictable two-or-three-dimensional pore structures assembled from molecular building blocks. 5 Their crystal structures are entirely held by strong bonds solely from light elements (B, C, N, H, and O) to form rigid porous architectures. These materials have exceptional thermal stabilities, and low densities, and permanent porosity with high specic surface areas. Their extraordinary and versatile properties have offered the COF materials superior potential in diverse applications, such as gas storage, 6 adsorption, 7 optoelectricity, 8 catalysis, 9 and biosensor. 10 As we know, many COFs have an extended p-conjugated system and inherent nanopores, which may hold promise for fundamental advances in supercapacitor electrode materials. 11 While, COFs has been scarcely reported as electrode materials for supercapacitors, which may be due to the limited chemical and oxidative stability of established COFs linkages precludes this applications.Since the rst report of graphene synthesized in 2004, it has emerged as one of the most active research elds. 12 Due to its fascinating properties, graphene is considered as a highly desirable support for many applications. 13 Here, we present a simple method to fabricate the COFs/graphene composite through the reaction of aldehyde group in 1,3,5-triformylbenzene and amine group in NH 2 -graphene and 1,4diaminobenzene in one step on the surface of amino functionalized graphene. The synthesized conjugated cova...