Scrolled graphene are designed by a simple microexplosion technique using a mild ionic catalyst-Fe3+, and assembled into the scroll-sheet conjoined nanomaterials (SSCNs) with unscrolled parts for supercapacitor. The morphology and structure of SSCNs are characterized by transmission electron microscope, N-2 adsorption/desorption, Raman spectra and energy-dispersive X-ray spectroscopy. The results demonstrate that graphene (GS) are partly scrolled on the edge, with the scroll and sheet conjoined together. SSCN has a high specific capacitance of 224 F g(-1) at 1.0 A g(-1), and still displays a specific capacitance of 181 F g(-1) at 30.0 A g(-1), while the value is only 95 F g(-1) for GS and 84 F g(-1) for the composites of GS and multi-walled carbon nanotubes (GS/MWCNTs), suggesting that the introduction of scroll-sheet conjoined structure significantly enhances the capacitive performance of GS. (C) 2015 Elsevier Ltd. All rights reserved.