Electrochemical Capacitors Based on Carbon Electrodes in Aqueous Electrolytes

Supercapacitors based on AC/MnO2 deposited onto dip-coated carbon nanofiber cotton fabric electrodes

“…The degradation of symmetric carbon-based SCs under high voltages with Li 2 SO 4 electrolyte by using accelerated ageing tests was previously investigated by Beguin et al [43,44]. They found that gases (e.g., CO 2 and CO) could start to evolve at a cell voltage higher than 1.5 V because the oxidation of carbon materials present in the positive electrodes.…”

Corrosion in Supercapacitors- An Overview

“…A neutral 1 M Na 2 SO 4 electrolyte solution was found to cause lowest corrosion by comparison with other electrolytes [160]. Lower corrosion activity of neutral electrolytes has been reported elsewhere [66]. Unfortunately, the basically preferable use of neutral electrolytes comes with the drawback of lower ionic conductivity of the electrolyte solution.…”

“…Ageing of supercapacitors reviewed elsewhere [64] is significantly caused by corrosion processes (see e.g. [65,66]). Self-discharge of supercapacitors is sometimes related to corrosion processes (see e.g.…”

Tuning the structure of in-situ synthesized few layer graphene/carbon composites into nanoporous vertically aligned graphene electrodes with high volumetric capacitance

“…Supercapacitors are known to work on twodifferent mechanisms, i) electrical double layer capacitance (EDLC, DL) relating to ion adsorption on high surface area, porous surfaces and, ii) pseudocapacitance (Ps) via slower chemical reversible faradic reactions. The major stepping stones in supercapacitor electrodes developments are carbon based materials including weakly graphitized activated carbon and graphitic carbons (graphene, carbon nanotubes/nanofibers), in which the Ps contribution from redox reactions is usually not negligible especially in activated and/or functionalized carbons and worthy to be considered [1]. Only recently, few works on Ps contribution investigations, in N-doped RGO [2] or graphitized carbons derived from aromatic cross-linked polymers [3], have been reported.…”