What is electric double layer capacitor (EDLC)?

Electric double layer capacitor (EDLC) [1, 2] is the electric energy storage system based on charge–discharge process (electrosorption) in an electric double layer on porous electrodes, which are used as memory back-up devices because of their high cycle efficiencies and their long life-cycles. A schematic illustration of EDLC is shown in Fig. 1.

What are supercapacitors & EDLC?

Supercapacitors also known ultracapacitors and electric double layer capacitors (EDLC) are capacitors with capacitance values greater than any other capacitor type available today. Supercapacitors are breakthrough energy storage and delivery devices that offer millions of times more capacitance than traditional capacitors.

Why do supercapacitors have a higher capacitance?

The thickness of the double layer reflects the electric double layer capacitor (EDLC). The deeper the electric double layer, the higher capacitance behavior is observed. Supercapacitors can be systematized into two major sorts of EDLCs and pseudocapacitors depending on the charge storage mechanism.

Can activated carbon be used in electric double layer capacitors?

The combinations of these materials provide a flexible means of optimizing the properties of electrodes for the electric double layer capacitors to balance the performance and cost. Among them, many attempts have been made to develop activated carbons for use in the electric double layer capacitors.

What is the capacitance mechanism of electric double layer capacitors?

Binoy K. Saikia The capacitance mechanism of Electric Double Layer Capacitors is similar to that of dielectric capacitors. In conventional capacitors, energy is stored by the accumulation of charges on two parallel metal electrodes which separated by dielectric medium with a potential difference between them.

Which materials can be used as electrodes of electric double layer capacitors?

Various forms of carbonaceous materials, i.e., powders, fibers, papers or cloth (fabric or web), carbon nanotubes, carbon nanofibers, and related nanocomposites are candidates as the electrodes of electric double layer capacitors .