Chemical compound | Role |
Redox-active functional groups | Electrical energy storage, electrical charge formation, interference in electrons flow, ions absorption [16] |
Metals | Electrical energy storage, mineral phase formation, participation in redox reactions [18] |
Free radicals | Electrical energy storage [19] |
Amorphous carbon | Serves as semipermeable membrane, formation of carbon-phase net [20] |
Graphitic carbon | Serves as semipermeable membrane, formation of carbon-phase net [20] |