Hierarchical V₄C₃T_X@NiO-reduced graphene oxide heterostructure hydrogels and defective reduced graphene oxide hydrogels as free-standing anodes and cathodes for high-performance asymmetric supercapacitors

Abstract

Asymmetric supercapacitors (ASCs) based on a battery-type anode and a capacitive-type cathode have been attracting extensive interest because of their high energy density. Herein, NiO nanosheets are hydrothermally deposited onto...

High-energy-density zinc ion capacitors based on 3D porous free-standing defect-reduced graphene oxide hydrogel cathodes

“…[2][3][4][5] In light of charge storage theory, SCs are divided into three categories: electric double-layer capacitors (EDLCs), pseudocapacitors, and asymmetric supercapacitors (ASCs). [6][7][8][9][10] EDLCs reserve charge by following the non-Faraday process of the electrostatic approach of positive and negative charge attraction. 11,12 Pseudocapacitors collect charge based on the Faraday approach, which requires transferring charge between the electrode and electrolyte.…”

Reduction-enhanced water flux through layered graphene oxide (GO) membranes stabilized with H3O+ and OH− ions

“…[15][16][17][18][19] In particular graphene oxide (GO), a derivative of graphene, has been in focus for membrane applications owing to for example the presence of abundant oxygen containing functional groups, superior water flux, high selectivity, excellent fouling resistance, easy scalability, and high aspect ratio. [20][21][22][23][24][25][26][27] In graphene oxide (GO), the carbon atoms are organised in a tight monolayer honeycomb lattice with abundant oxygencontaining functional groups, including for instance epoxy, hydroxyl and carboxyl groups. 28 Owing to the presence of these functional groups, GO sheets can easily be dispersed in water.…”