Design of a pseudocapacitive cathode based on polypyrrole-derived carbon tube supported anthraquinone for lithium-ion hybrid capacitors

Preparation of Positive and Negative Composite Electrode Materials for High-Performance Aqueous Asymmetric Supercapacitor by a Sequential Two-Step Reaction

“…If appropriate organic electrode materials with different types of doping are selected to assemble asymmetric devices, one electrode is p-doping while the other is n-doping, which could provide high energy density. − However, the electrical conductivity of redox-active organic compounds has been limited by the degree of doping, resulting in the inability to utilize those advantages fully. Therefore, researchers have primarily focused on attaching organic materials to highly conductive carbon-based materials, such as activated carbon, carbon nanotubes, , and graphene , via π–π stacking, hydrogen bonding, and other noncovalent interactions. , To further increase the energy density, these composite electrode materials are utilized in the assembly of asymmetric devices. − For example, Jiao et al assembled asymmetric supercapacitors by fabricating redox-active PPA/rGO and GH-DN for the positive and negative electrodes, respectively. Kandambeth et al synthesized redox COFs structures for the negative electrode and assembled asymmetric supercapacitors using RuO 2 as the positive electrode.…”

“…24−28 However, the electrical conductivity of redoxactive organic compounds has been limited by the degree of doping, resulting in the inability to utilize those advantages fully. Therefore, researchers have primarily focused on attaching organic materials to highly conductive carbonbased materials, such as activated carbon, 29 tubes, 30,31 and graphene 32,33 via π−π stacking, hydrogen bonding, and other noncovalent interactions. 34,35 To further increase the energy density, these composite electrode materials are utilized in the assembly of asymmetric devices.…”