Nickel oxide (NiO) nanoparticles loaded on porous strontium-substituted lanthanum cobaltite (La0.7Sr0.3CoO3-delta, LSC) ceramic substrate is fabricated as a novel binder-free electrode (NiO/LSC) for electrochemical capacitors. The LSC substrate is synthesized through a simple solid-state method. NiO nanoparticles are loaded onto the porous LSC substrate by infiltrating a nickel nitrate (Ni(NO3)(2)) solution into the pores, followed by calcination. The composite electrode NiO/LSC with a high mass loading of NiO (similar to 10 mg cm(-2)) exhibits an appreciable areal capacitance of 10.6 F cm(-2), a specific capacitance of 1064.1 F g(-1) and remarkable cycling stability (80.1% retention after 3000 cycles at 20 mA cm(-2)). Moreover, an asymmetric electrochemical capacitor, with NiO/LSC as the positive electrode and carbon cloth as the negative electrode, confirms the excellent capacitive properties, with high energy density of 9.27 mWh cm(-3) under a wide potential of 1.65 V. This work indicates the promising application of NiO/LSC as an advanced electrode for electrochemical capacitors. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.