High-performance energy storage devices are much needed to meet the growing energy demand. Growing populations, use of smart devices, and increasing demand for electric vehicles are some of the energydemanding factors. Batteries and supercapacitors are some of the high-performance devices which can meet the growing demand for portable energy. These devices should provide high energy density, long cycle life, improved safety, and eco-friendliness. Supercapacitors are attracting considerable attention due to many characteristics such as high energy and power density with significantly high cycle life. However, to meet the current energy demand, their energy storage capacity has to be improved. In this work, many cobalt oxidesbased nanomaterials were synthesized using metal-organic frameworks (MOF). The MOF-derived cobalt oxides provided tunable surface area and porosity. The electrochemical properties of these materials were tuned by calcining these samples at various temperatures which affected their morphology, crystallinity, and surface area. These changes largely affected the electrochemical properties of these materials and thus the energy storage capacity. The electrochemical properties of the synthesized materials were studied using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The energy storage capacity of these materials was in the range of 41 to 203 F/g depending on the growth conditions. The energy storage capacity of these materials was increased from 2 Wh/kg to about 9 Wh/kg. This study suggests that facile approaches such as simple calcination could significantly improve the electrochemical properties of MOF-derived cobalt oxide materials and could be used as electrode materials in supercapacitor devices.
Choi, Jonghyun; Ellis, Madeline; Gupta, Ram; Allison, Cassia; and Gupta, Anjali, "Effect of calcination on the energy storage capacity metal-organic framework-derived cobalt oxides" (2022). Posters. 5.