Low cost, non-toxic nanomaterials and their controllable synthesis are highly demanded in the field of supercapacitors. In this work, nanoneedle and nanosheet-like porous NiCo2O4 architectures were directly fabricated on graphitic carbon nitride (g-C3N4), indicating structure dependence on their capacitive performances. Electrochemical performances show that nanoneedle-assembled NiCo2O4/g-C3N4 exhibits higher specific capacitance (253 F g (1) at a current density of 2 A g (1)), while nanosheetassembled NiCo2O4/g-C3N4 possesses a better cycling durability (101.4% capacitance after 1000 cycles) in a three-electrode configuration. Further studies indicate that these electrochemical differences are related to the structure and electrochemical impedance of nanocomposites. (C) 2016 Elsevier Ltd. All rights reserved.