Cobalt and Calcium-based Metal-Organic Frameworks (MOFs) as an Energy and Advanced Electrode material for Supercapacitors

Abstract

Abstract Cobalt and Calcium - based metal-organic frameworks (Co-MOF and Ca-MOF) [Co (tpa) (mi) and Ca (tpa)] (tpa = terephthalic acid and mi = methyl imidazole) was synthesized through solvothermal method. Structural characterization revealed that metal centers are equally occupied by Co2+ and Ca2+ ion. Supercapacitive behaviour of synthesized Co-MOF and Ca-MOF were evaluated using cyclic voltammetry (CV), galvano static charge/discharge, and electrochemical impedance spectroscopy (EIS) measurements in 6 M KOH as electrolyte. The Co and Ca-MOFs exhibited outstanding specific capacitance of 1726 and 185Fg− 1 at a discharge current density of 1 Ag− 1, good rate capability, and 97.4% capacitance retention after 3000 cycles. To the best of our knowledge, Co-MOF and Ca-MOFs are used in supercapacitor and its encouraging properties indicate that Co/Ca-MOF can be promising candidate as an advanced electrode material for supercapacitors.