▎ 摘　　要

Using concentrated sulfuric acid as the solvent, nanocomposites of iron (II) phthalocyanine and graphene oxide (denoted as FePcGOn) are rationally and facilely fabricated by self-assembly via pi-pi interactions. The unique structure of FePcGO2 renders the nanocomposites greatly improved conductivity and accelerated rates of both charge transfer and electrolyte migration. The tightly pi-pi stacking between FePc and GO bestows the materials structural stability. The molecularly dispersive FePc contributes much pseudocapacitance to elevate the energy density of supercapacitor. Three-electrode test reveals a high specific capacitance of 514 F g(-1)for FePcGO2 at a current density of 1 A g(-1). A capacity of 90 F g(-1)sustains at an ultrahigh current density of 500 A g(-1). Symmetrical two-electrode supercapacitor also demonstrates excellent supercapacitive properties of FePcGO2 and delivers a capacitance of 235.5 F g(-1)at 1 A g(-1)over 1 V with an energy density of 8.2 Wh kg(-1). A steady capacity of 200.2 F g(-1)sustains at 5 A g(-1)after 60,000 cycles. Symmetrical FePcGO2 supercapacitor achieves high capacity of 308.6 F g(-1)and energy density of 21 Wh kg(-1)over 1.4 V at 1 A g(-1). The present work provides insights into high-performance supercapacitive materials.