Synthesis and electrochemical performance of V₂O₅ nanosheets for supercapacitor

Electrode materials are the key to the electrochemical performance of supercapacitors. This study reports the electrochemical properties of V 2 O 5 supercapacitors. V 2 O 5 nanosheets with different morphologies were prepared by controlling the solvent under a facile hydrothermal method. The phase and the morphology of the samples were characterized by x-ray diffraction and scanning electron microscopy. The electrochemical properties of V 2 O 5 nanosheets with different morphologies were studied by cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The charge transfers resistance decreases from 3.2 Ω of V 2 O 5 particles to 2.0 Ω of V 2 O 5 nanosheets. V 2 O 5 nanosheets exhibit higher specific capacity (375 F g −1 ) than V 2 O 5 particles (318 F g −1 ) in K 2 SO 4 solution. The cycling capacity retention keeps 96.8% for 1000 cycles at 0.5 A g −1 in K 2 SO 4 solution, indicating better cycling stability.