Facile Synthesis of Vanadium Metal‐Organic Frameworks for High‐Performance Supercapacitors

Abstract

Abstract Compared to traditional metal oxides, metal‐organic frameworks exhibit excellent properties, such as a high surface area, significant thermal stability, low density, and excellent electrochemical performance. Here, a simple process is proposed for the fabrication of rod‐like vanadium metal‐organic frameworks (V IV (O)(bdc), bdc = 1,4‐benzenedicarboxylate, or MIL‐47), and the effect of the structure on the electrochemical performance is investigated via a series of electrochemical measurements. The V IV (O)(bdc) electrode exhibits a maximum specific capacitance of 572.1 F g −1 at current densities of 0.5 A g −1 . More significantly, aqueous and solid‐state asymmetric supercapacitors are successfully assembled. The solid‐state device shows an excellent energy density of 6.72 mWh cm −3 at a power density of 70.35 mW cm −3 . This superior performance confirms that V IV (O)(bdc) electrodes are promising materials for applications in supercapacitors.