The electrochemical properties of metal oxides are very attractive and fascinating in general, making them a potential candidate for supercapacitor application. Vanadium oxide is of particular interest because it possesses a variety of valence states and is also cost effective with low toxicity and a wide voltage window. In the present study, vanadium oxide nanorods were synthesized using a modified sol–gel technique at low temperature. Surface morphology and crystallinity studies were carried out by using scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy analysis. To the best of our knowledge, the as-prepared nanorods were tested with magnesium ion based polymer gel electrolyte for the first time. The prepared supercapacitor cell exhibits high capacitance values of the order of ~ 141.8 F g⁻¹ with power density of ~ 2.3 kW kg⁻¹ and energy density of ~ 19.1 Wh kg⁻¹. The cells show excellent rate capability and good cycling stability.

金属氧化物的电化学性质通常非常有吸引力和令人着迷，使它们成为超级电容器应用的潜在候选者。氧化钒特别受关注，因为它具有多种价态，而且具有低毒性和宽电压窗口的成本效益。在本研究中，使用改进的溶胶-凝胶技术在低温下合成了氧化钒纳米棒。通过使用扫描电子显微镜、透射电子显微镜、X射线衍射和X射线光电子能谱分析进行表面形态和结晶度研究。据我们所知，首次使用基于镁离子的聚合物凝胶电解质对制备的纳米棒进行了测试。⁻¹功率密度为~ 2.3 kW kg ^-1，能量密度为~ 19.1 Wh kg ^-1。该电池表现出优异的倍率性能和良好的循环稳定性。