An Activated Carbon (AC) Supercapacitor, also known as an electric double-layer capacitor (EDLC), is an energy storage device that bridges the gap between traditional capacitors and batteries. It offers high power density and an incredibly long cycle life. Activated carbon is the most common electrode material because of its unique physical properties: (1) Extreme Surface Area: "Activation" (using steam or chemicals) creates a vast network of micropores. A single gram of activated carbon can have a surface area of 1,000 to 3,000 m^2—roughly the size of half a football field. (2) Pore Size Distribution: To work effectively, the pores must be large enough for the electrolyte ions to enter but small enough to maximize the surface area. (3) Electrical Conductivity: AC provides a reliable path for electrons to flow to the current collector. (4) Low Cost: It is derived from abundant sources like coconut shells, wood, or coal.

Notes: Please try to store the activated carbon YEC8A powder in a dry place (glovebox is the best option). 

References: 

1. J Gamby, et al. Studies and characterisations of various activated carbons used for carbon/carbon supercapacitors, J. Power Sources, 2001, 101, 109-116.
2. B. Li, et al. Nitrogen-doped activated carbon for a high energy hybrid supercapacitor, Energy Environ. Sci., 2016, 9, 102-106.