Carbon-incorporated Fe₃O₄ nanoflakes: high-performance faradaic materials for hybrid capacitive deionization and supercapacitors

Abstract

Here, we introduce a new strategy using urea to the synthesis of carbon-incorporated 2D Fe3O4 (2D-Fe3O4/C) nanoflakes under solvothermal conditions with the following pyrolysis process under an inert atmosphere. Thanks...

Dimensional optimization enables high-performance capacitive deionization

“…153 Chen et al achieved a high specic capacitance of 386 F g À1 at 1 A g À1 based on the structural advantages of 2D-Fe 3 O 4 /C nanosheets, high specic surface area and active sites. 152 With their nanometer/sub-nanometer thickness, almost all metal atoms came in direct contact with the electrolyte and could participate in redox reactions, resulting in pseudocapacitance close to the theoretical value. 154 Notably, they have high specic surface areas and exotic electronic properties; therefore, TMO has a wide range of application prospects in energy storage and is a potential CDI electrode material.…”

“…In the search for more efficient CDI materials, TMO was discovered by researchers. 2D TMO (or layered metal oxide) refers to 2D layered structured TMO nanosheets, which can exist in the form of layered crystals (Fe 3 O 4 , MoO 3 , V 2 O 5 , Ga 2 O 3 , and WO 3 ) inherently, or can be synthesized in practice by advanced technology [150][151][152] (such as peeling, layer-by-layer deposition, dip coating, etc.). TMO is widely used in energy storage devices for its high conductivity, high reversible Faraday response, abundant natural resources and low manufacturing cost.…”

“…154 Notably, they have high specic surface areas and exotic electronic properties; therefore, TMO has a wide range of application prospects in energy storage and is a potential CDI electrode material. [155][156][157] Current strategies to produce two-dimensional materials include gas-phase synthesis [158][159][160] and solution-based synthesis (liquid exfoliation [161][162][163][164] or chemical synthesis 152,165,166 ). Gas-phase synthesis can be made into large-sized and intact 2D nanosheets but it is limited by low yield.…”

A multi-interface CoNi-SP/C heterostructure for quasi-solid-state hybrid supercapacitors with a graphene oxide-containing hydrogel electrolyte

“…16 Secondly, a multivariate material with NiCoP, Co 9 S 8 , Ni 9 S 8 , and carbon components provides multiple faradaic reactions, abundant hetero-interfaces, and relatively high conductivity to expedite the electrochemical kinetics and enhance the charge storage capacity. 30–32 Thirdly, the successive conduction pathway formed by the derived carbon and metalloid NiCoP can promote electronic transfer in the hybrid, ultimately resulting in better rate capability of the hybrid. Therefore, satisfactory energy and power densities, as well as long durability are expected in the CoNi-SP/C-based HSCs.…”

Preparation of Network-Structured Carbon Nanofiber Mats Based on PAN Blends Using Electrospinning and Hot-Pressing Methods for Supercapacitor Applications

“…Among them, carbon-based materials are considered possible candidates for flexible energy storage applications owing to their large specific surface area, high electrical conductivity, light weight, flexibility, and fast ion response for reduced ion transport path, etc. [ 12 , 13 , 14 ]. However, at the same time, excellent mechanical stability and electrochemical properties are really tough to achieve from carbon materials.…”