A facile hydrothermal reaction has been developed for the large-scale growth of Bi₂MoO₆ nanosheets on conductive substrates with robust adhesion as high performance electrodes for electrochemical capacitors. It was found that the nickel foam facilitates the formation of a uniform nanosheet array with fast electron and ion transportation, a large electroactive surface area and an excellent structural stability. As a result, it shows a specific capacitance of 37.3 F g⁻¹ even at a current density of 2 A g⁻¹ and a high cycling stability with 89% retention of its initial specific capacitance after 1000 cycles in 1 M KCl solution. These results provide a way of fabricating Bi₂MoO₆ nanosheet arrays as efficient electrodes for electrochemical capacitors.