Vanadium oxides (such as V 2 O 5 , V 2 O 3 and VO 2 ) hold great promise as electrode materials for energy storage due to their high electrochemical activity, low cost and environmental benignity. However, V 3 O 7 is rarely investigated as a supercapacitor material. Herein, nest-like V 3 O 7 self-assembled by porous V 3 O 7 nanowires was fabricated. The energy storage mechanism of V 3 O 7 was investigated at different reaction potentials. It was found that V 3 O 7 was converted to V 6 O 13 at a potential of -0.6 V, and became V 2 O 5 at 0.2 V. ...
