In situ encapsulation of V2O5@ZIF-8 nanocomposites as electrode materials for high-performance supercapacitors with long term cycling stability. Issue 8 (14th February 2023)

• Record Type: Journal Article
• Authors: Siva, V.; Murugan, A.; Shameem, A.; Thangarasu, S.; Kannan, S.; Bahadur, S. Asath
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 8(2023)
• Page Start: 3070
• Page End: 3085
• Publication Date: 2023-02-14
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc03996f
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The development of hierarchical MOFs consisting of interconnected nanostructures is of great attention in biosensors, energy storage, health care and catalysis as a consequence of efficient mass transfer kinetics by means of mesopores. Abstract : The development of hierarchical metal–organic frameworks (MOFs) consisting of interconnected nanostructures is of great importance for biosensors, gas separation, energy storage, healthcare and catalysis as a consequence of efficient mass transfer kinetics by means of mesopores. We outline a simple strategy to modify zeolitic imidazolate framework-8 (ZIF-8) with porous V2 O5 to achieve V2 O5 incorporated ZIF-8 nanocomposites through a simple in situ synthesis method. Powder X-ray diffraction and infrared spectroscopy analyses confirmed the formation of the hybrid nanocomposites. A strong band at 421 cm −1 corresponding to Zn–N stretching has been observed due to the bonding of the zinc atoms in the ZIF-8 structure with the nitrogen atoms of the 2-methylimidazole linker during the formation of V2 O5 @ZIF-8 composites. The nanocomposites have been morphologically characterized using scanning electron microscopy and transmission electron microscopy analyses. The electrochemical performance is evaluated based on high potential redox reactions occurring in a blend of additive redox electrolytes in a potential window of 0.85 V, attaining a capacity of 802.88 F g −1 at 10 A g −1 . These hybrid nanocomposites have higher electrochemical capacitance than ZIF-8 nanocrystals as advanced materials for supercapacitor electrodes. This fascinating electrochemical capability is majorly associated with the synergistic effect of the Zn-MOF and vanadia nanoparticles. These characteristics make our V2 O5 @ZIF-8 nanocomposite an ideal MOF-based electrode for high-performance energy storage applications. An asymmetric supercapacitor device fabricated using the redox additive electrolyte shows energy densities and power densities of 8.56 Wh kg −1 and 1923.07 W kg −1, respectively.