Simple solid-state chemical reaction was adopted to synthesize NiMoO4 nanomaterials with different crystal phase without the use of organic solvent or templating agent. The as-prepared NiMoO4 center dot xH(2)O, alpha-NiMoO4 and beta-NiMoO4 nanostructures were investigated as the electrode materials for supercapacitors. The beta-NiMoO4 nanorods were composed of the nanoparticles, which exhibited relatively high specific capacitances about 1415 F g(-1) at a charge density of 1 A g(-1), 80.2% of the initial reversible capacity was maintained after 1000 cycles. The beta-NiMoO4//rGO asymmetric supercapacitor (ASC) system was assembled in serials, which displayed high specific energy density of 29.3 Wh kg(-1) at a high power density of 187 W kg(-1). This ASC system can drive the light-emitting diode (LED) effectively and give out light about 40 min, even easily light two LEDs in serials for 20 min. The remarkable electrochemical performances make the as-prepared NiMoO4 nanostructures an excellent candidate as electrode materials for advanced supercapacitors. (C) 2018 Elsevier Inc. All rights reserved.