High Cell Volume Zn-Metal–organic Framework: Unveiling the Pseudo-capacitor Properties and Selective Colorimetric Recognition of Oxyanions
Vibhav Shukla, Musheer Ahmad, Ganesh Chandra Nayak, Tejender S. Thakur, Kafeel Ahmad Siddiqui
Abstract
Metal–organic frameworks (MOFs) possess distinctive characteristics such as a significant specific surface area, specialized porous structures, multiple active sites, and outstanding electrochemical properties. Owing to their large-scale applications, in this work a new MOF [Zn 9 (Cei) 6 (Bimb) 9 ] n ( 1 ), has been synthesized under room temperature conditions with [H 2 Cei = bis(2-carboxyethyl) isocyanurate, Bimb = 1,4-bis[(1 H -imidazol-1-yl)methyl]benzene], which has an extra ordinary cell volume of 23,622.8 (3) Å 3 .The materials have been thoroughly analyzed using X-ray diffraction (SCXRD and PXRD), FTIR, scanning electron microscopy, energy dispersive X-ray spectroscopy, and Brunauer–Emmett–Teller. This study identifies, ( 1 ) as a highly effective luminescent sensor for Cr 2 O 7 2–, CrO 4 2–, and MnO 4 – anions in ethanolic solution with LOD values of 3.3 × 10 –6 (0.640 ppm) for CrO 4 2–, 8.1 × 10 –6 (0.238 ppm) for Cr 2 O 7 2–, and 8.1 × 10 –6 (0.129 ppm) for MnO 4 – anions, respectively. The electrochemical properties of ( 1 ) were explored using cyclic voltammetry and galvanostatic charge–discharge study in 1 M TEABF 4 in acetonitrile electrolytes. The electrode material exhibits a specific capacity of 33 F g –1 at a current density of 1 A g –1 based on a discharge period of 13 s. The electrode material demonstrates 78.2% capacitance retention after 10,000 cycles, making it a potential candidate for energy storage applications.