A facile and well-tailored vanadium oxide porous network for high-capacity electrochemical capacitive energy storage

•Vanadium oxide porous network has been synthesized via a facile method through controlling solution polarity at room temperature.•A possible mechanism is proposed to explain the formation of different nanostructured VOx·yH2O.•The porous vanadium oxide delivers a high specific capacitance of 280 F g−1.

In this work, 3D interconnected porous vanadium oxide network is prepared by a facile and effective method through controlling solution polarity at room temperature. The resulted samples were systemically characterized by XRD, SEM, TEM and electrochemical measurements to study the synthesis–structure–performance correlation and further used for the electrochemical capacitive energy storage. The experimental results indicate that the microstructure of the as-prepared samples can be effectively tailored by the polarity of reaction solution and the obtained 3D interconnected network delivers a high specific capacitance of 280 F g−1, providing promising potentials as an electrode material for high-performance supercapacitor.