Indian Journal of Advances in Chemical Science Volume: 7, Issue 1: , January 2019

ISSN No.: 2320-0898 (Print); 2320-0928 (Electronic)

DOI: 10.22607/IJACS.2018.701002

Review Article

Synthesis, Crystal Structure, and Characterization of Manganese-Metal-Organic Framework with Improved Electrocatalytic Activity for Supercapacitor Application

G. Krishnamurthy*, B. M. Omkaramurthy

ABSTRACT

A manganese metal-organic framework (Mn-MOF) has been synthesized using a low-temperature solvothermal procedure in the presence of terephthalic acid and 1-methylimidazole in dimethylformamide. The crystal structure studies were made and found that the molecule has a three dimensional framework in which the θ ranges from 5.942 to 50 with monoclinic I2/a space group. The final full matrix least-square refinement over F2 is converged on R1 = 0.0558, wR2 = 0.1696 through goodness-of-fit = 1.095. The surface area of the Mn-MOF has been measured by Brunauer–Emmett–Teller method and the surface area was found to be 1.2352 m2/g. The average pore diameter and pore volume were about 2.6 nm and 0.00569 cc/g, respectively. The electrochemical studies were made by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques and found that the Mn-MOF has high charge storage capacity up to 4000 Fg-1, which reflects the supercapacitor behaviour of the material. Also Mn-MOF material exhibits the energy density up to 500 (Whkg-1) and the power density of about 0.125 (Wkg-1). These values imply that the Mn-MOF can be an efficient material for electrochemical supercapacitor/other energy storage application.

Key words: Manganese metal-organic framework, Secondary building units, Solvothermal synthesis, Supercapacitor, Cyclic voltammetry.

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