Advances in materials and structures of supercapacitors

Ligand Incorporating Sequence-dependent ZIF67 Derivatives as Active Material of Supercapacitor: Competition between Ammonia Fluoride and 2-Methylimidazole

“…Electrochemistry plays significant roles in energy storage and generation devices. − The electrochemical system is normally composed of active material, conductive substrate, electrolyte, and membrane. , The active material is generally considered as the most important part for dominating the electrochemical performance. For example, energy and power densities of energy storage devices are greatly influenced by the morphology and composition of active materials. − Therefore, designing efficient active materials with excellent surface properties and suitable compositions is of great significance to achieve high energy storage abilities …”

“…11−13 Therefore, designing efficient active materials with excellent surface properties and suitable compositions is of great significance to achieve high energy storage abilities. 14 A metal organic framework (MOF) with high specific surface area and tunable pore sizes has been intensively applied on energy storage devices recently. 15−18 The MOF composed of an electrocapacitive metal center such as zeolitic imidazolate framework 67 (ZIF67) comprised of a cobalt ion as the metal center and 2-methylimidazole (2-Melm) as the ligand is more attractive as battery-type material for energy storage devices.…”

A high-performance supercapacitor based on free-standing V4C3TX@NiO-reduced graphene oxide core–shell hierarchical heterostructured hydrogel electrodes

“…4 SCs have been attracting increasing attention where high power density, excellent cycling stability, and fast charging/discharging is required, such as electric/hybrid vehicles, load-leveling systems for intermittent renewable energy sources and light rail, and hybrid batteries. [5][6][7] Although SCs can deliver a higher energy density than capacitors, the performance remains lower than that of batteries. 5 According to the charge storage mechanism, SCs can be classied into electric double-layer capacitors (EDLCs) and pseudocapacitors.…”

“…[5][6][7] Although SCs can deliver a higher energy density than capacitors, the performance remains lower than that of batteries. 5 According to the charge storage mechanism, SCs can be classied into electric double-layer capacitors (EDLCs) and pseudocapacitors. EDLCs store and release charges at the electrode/electrolyte interface via rapid ion adsorption/desorption.…”

“…Carbon-based materials are the most common electrode materials for EDLCs. 5,8,9 For pseudocapacitors, energy is stored through a faradaic process involving fast reversible redox reactions occurring both on the surface and in the interior of the electrode materials. Most pseudocapacitive materials are conductive polymers and metal oxides/hydroxides.…”