Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Impact of Structural Defects in the Functionalized Graphene with –COOH on the Efficiency of Graphene-Based Supercapacitors

Document Type : Research Article

Authors
Ehsan Targholi 1
Seyed Morteza Mousavi Khoshdel 1
Mohammadsafi Rahmanifar 2
1 Department of Chemistry, Iran University of Science and Technology, Tehran, I.R. IRAN
2 Faculty of Basic Sciences, Shahed University, Tehran, I.R. IRAN
Abstract
Today, generation and storage of energy are one of the important areas of researches. Like an electrochemical battery, Supercapacitors are used to store electrical energy. Supercapacitors have attracted a great deal of attention thanks to their great advantages such as high power density, no memory effect, long life cycle and good stability. However, low specific energy is still their primary limiting factor for their usage as the electrical storage devices in industrial and commercial applications. Graphene-based materials are promising materials for use in supercapacitor electrodes. Despite many advantages of the graphene-based electrode, the major limitation of the low quantity of specific capacitance due to their low quantum capacitance remain. We explored the variations of quantum capacitance of graphene-based electrodes by functionalization and making defect. Overall, our results demonstrate that with creation of structural defects on functionalized graphene, a significant improvement in electrode capacity will be achieved. Some structural defects increase the capacity at the high voltage magnitudes. In contrast, some other structural defects increase the capacity at the lower voltage magnitudes. So, we could design the asymmetric Supercapacitors with high capacity using clever combination of functionalized graphene and structural defects.
Keywords
Supercapacitors
Functionalized graphene
DFT
Quantum capacitance

Subjects

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