Structurally stable Fe–Ni–Co phosphide/graphene and nitrogen-doped carbon/graphene constructed by atomic layer deposition for high-performance hybrid supercapacitor

High-Performance Supercapacitor with a Hybrid Nanostructure of Sputter-Decorated AgxO over Co–Mn–Cu Ternary Metal Oxide

“…With rising energy demand, pollution levels, and the rapid exhaustion of fossil fuels, there is an increasing shift toward green, inexhaustible energy sources. For the shift to renewable energy production to be successful, we need improvements in energy storage technologies. − Owing to features like a prolonged life cycle, high power density, and good cyclic stability, supercapacitors or ultracapacitors are emerging as an eco-friendly alternative to batteries , Supercapacitors have three modes of operation based on the type of interactions at the electrode–electrolyte interface, namely, an electrical double-layer capacitor (charge segregation in the Helmholtz double-layer), a pseudocapacitor (transfer of electrons), or a hybrid supercapacitor (formation of a double layer and transfer of electrons). , Typically, graphene, − carbon nanotubes, activated carbon, and other carbon-based materials , behave as a pure double-layer capacitor, while conducting polymers and transition metal oxides (TMOs) − are good choices for pseudocapacitors. The presence of multivalent ions and pseudocapacitive mechanisms of charge storage, , low environmental toxicity, and easy availability make TMOs a strong contender.…”