Used carbon water filter—A source for high performance microporous activated carbon electrode for aqueous supercapacitor

Polyanilines from spent battery powder and activated carbon: Electrodes for asymmetric supercapacitor cell

“…The TGA pattern of AC showed two‐stage weight loss steps, where the first weight loss of 11 wt% is up to 100°C because of the loss of adsorbed water molecules. Later, the thermogram seemed to be nearly stable up to 550°C, and then second weight loss started and occurs weight loss of 5 wt%; because of functional groups decomposition such as hydroxyl (OH), carbonyl (CO), alkyl (CH), ester (COOR) and lactones, and so forth, which usually exists in activated carbons 49,50 . Finally, an entire weight loss of 21 wt% is detected up to 800°C.…”

“…In addition, a small amount of pseudocapacitance comes from the redox reactions due to the transitions of quinone ↔ hydroquinone of carbonyl groups. The carbonyl groups usually form on the carbon during the high‐temperature chemical activation process 49,56 . The CV curve of PANI displays two pairs of characteristic redox peaks which are related to pseudocapacitive performance due to the Faradaic reactions, wherein the first redox peak can be attributed to the transition of leucoemeraldine (fully reduced form) to emeraldine salt (partially oxidized form).…”

Template-Free Preparation of α-Ni(OH)2 Nanosphere as High-Performance Electrode Material for Advanced Supercapacitor

“…The enhanced specific capacitance of Ni(OH) 2 -36 is probably due to the specific area resulting from the ball texture, which is verified by the N 2 adsorption/desorption isotherms in Figure S8 and Table S2. The average pore sizes of all samples range from 3.401 to 3.807 nm and can be considered mesoporous materials [46]. Remarkably, the Ni(OH) 2 -36 exhibits a larger BET-specific surface area of 119.4 m 2 /g than Ni(OH) 2 -24 (42.0 m 2 /g), Ni(OH) 2 -48 (59.2 m 2 /g) and Ni(OH) 2 -60 (37.1 m 2 /g).…”

Honeycomb graphene–polyaniline nanocomposites as novel electrode materials for high-performance supercapacitors

“…[6][7][8] Despite these advantages, there are requirements to improve the energy storage performance of supercapacitors, mainly by improving the performance of electrodes. Various materials have been considered as electrode materials for supercapacitor applications, including amorphous carbon materials, 9,10 bimetallic sulfide nanotubes, 11 transition metal oxides, 12 Cobalt Oxide@Nitrogen Doped Carbon Nanowires 13 and conducting polymers. 14 Alternatively, graphene has been widely employed as an electrode material for double-layer capacitors because of its high specific surface area (2630 m 2 g À1 ) 15 and high conductivity (10 3 -10 4 S m À1 ).…”