||Herein, we report a facile, scalable, and the effective shape-controlled nanohorn-like structured cobalt oxide materials have been successfully synthesized through solvothermal strategy followed by calcining at different temperature. To the best of our knowledge, it is the first report of the nanohorns-like structure of cobalt oxide synthesized through template or surfactant free methods. More prominently, electrochemical measurements reveal that the size and calcining temperature affects their electrochemical properties. Because the tunable surface components and defects of the obtained active electrode materials can be accomplished with the help of simply controlling the calcination temperature without change the morphology. The obtained electrodes show high specific capacitance and high cycle performance after 10000 cycles. In addition, the low resistance and exceptional cycling stability, making them promising materials for supercapacitor application.