Chelated Zn–Metal–Organic Frameworks: Synthesis, Crystal Structure and Electrochemical Energy Storage

Abstract

We have successfully synthesized the chelated Zn-EDTA metal-organic framework (Zn-MOF) by an eco-friendly hydrothermal route at 160 °C. The product obtained was confirmed by techniques such as ATRIR, SEM, SXRD, TGA, and BET. High stability, homogeneous topology, and significant surface area are the notable properties, which have been studied. The electrochemical redox behavior property of the as-prepared Zn-MOF electrode was investigated in 0.005 M K 4 Fe(CN) 6 solution by Cyclic voltammetry. The CV nature obtained by the Zn-MOF electrode implies the typical battery act from the surface redox reaction. The chelated Zn-MOF electrode has been subjected to charge-discharge study to find out the specific capacity of the Zn-MOF electrode in KOH solution different temperatures and also in mixed electrolyte separately. Higher specific capacity of the Zn-MOF electrode about 243.2 mA hg −1 was found at room temperature in 0.1 M KOH at 1 Ag −1 . Also, excellent capacity about 589.28 mA hg −1 was observed in mixed electrolytes. The Zn-MOF to be a promising candidate for energy (gas) storage application.

Energy Storage Applications of Cobalt and Manganese Metal–Organic Frameworks

“…The MOF electrode (working electrode) for the electrochemical studies was prepared using a mechanically grounded mixture of prepared MOF (60%), carbon black (20%) and polytetrafluoroethylene (20%). The obtained slurry was then covered onto nickel mesh conductor (1 cm × 1 cm) and dried at room temperature for about 24 h [7]. Subsequently, it was pressed and obtained as the final electrode material.…”

“…All the electrochemical experiments were conducted on AUTO LAB PGSTAT302N electrochemical work station with a conventional three-electrode system consisting of MOF electrode as a working electrode, platinum electrode as auxiliary (counter) electrode and saturated calomel (saturated KCl) as reference electrode. The electrochemical performance of the individual electrode was conducted using a three-electrode assembly in 0.1 M KOH electrolyte [7,28]. Specific capacity was calculated based on Eq.…”

“…Cyclic voltammogram contains the intense and clearly separated oxidative and reductive peaks, which generally due to the electrochemical feature of the battery [4][5][6][7].…”

“…Hence, these materials can be employed for the applications in electrochemical energy storage systems such as, lithium-ion batteries, supercapacitors, including fuel cells, solar cells and also in catalysis, sensors, sewing, and separation, etc. [1][2][3][4][5][6][7][8][9][10][11]. In the past few years, the energy-related and worldwide environmental related problems are consistently increasing.…”

Supercapacitor electrodes based on metal‐organic compounds from the first transition metal series

“…The cycling stability in both three‐ and two‐electrode system is estimated with the capacitance retention after a specific charge‐discharge cycle number by either CV or GCD method. However, in a few cases, especially those for battery‐SC hybrid applications, the authors only reported the specific capacity (in C g −1 /C cm −2 /C cm −3 or mAh g −1 /mAh cm −2 /mAh cm −3 ) of the electrode materials based on metal‐organic compounds 25‐39 . Considering that the specific capacitance is the parameter reported in the most research papers of SC discipline, those literatures which only reported the specific capacity of transition metal‐organic compounds of the first transition metal series as SC electrode materials are not included in this review.…”