Supercapacitors is an electrochemical energy storage device typically used as sustainable power supply (such as electric vehicles and mobile electronic devices) due to their higher power density than batteries, higher energy density than conventional dielectric capacitors, and long life cycles. [1,2] Graphene, a two-dimensional (2D) one-atom-thick single layer of sp2-bonded carbon, is considered as an ideal electrode material in supercapacitors because of its superior electrical conductivity and exceptionally large specific surface area. Graphene sheets, unless well separated from each other, tend to form irreversible agglomerates through strong π-π stacking and van der Waals interaction.[3] Meanwhile, the electrochemical binders and additives are normally required to make graphene-based electrodes, which would have an adverse effect on the specific capacitance of the resulting electrodes. To tackle these challenges, three dimensional (3D) graphene networks with highly electrical conductivity and large specific surface area, short diffusion pathways for electrolyte ions and fast transport channels for electrons are very promising supercapacitor materials. To these aims, we have developed ways to synthesize a novel macroporous/nanoporous graphene sponge with tunable pore sizes. This 3D porous graphene sponge has i) an interconnected electrolyte-filled macroporous network that enables increase of contact surface between 3D network and electrolytic solution, and rapid ion transport, ii) short ion and electron transport lengths due to nanoporous structures, iii) a large electrode specific surface area and (iv) high electron conductivity in the electrode assembly. The structure characterization and capacitive properties of the 3D macroporous/nanoporous graphene sponge was investigated and discussed, indicating 3D porous graphene sponge as an ideal electrode materials for supercapacitors. Keywords：Graphene, 3D porous materials, supercapacitors, electrochemical energy
120Mesoporous carbons synthesized by direct carbonization of citrate salts for use as high-performance capacitors
Mesoporous carbons synthesized by direct carbonization of citrate salts for use as high-performance capacitors
139Carbon quantum dots anchoring MnO2/graphene aerogel exhibits excellent performance as electrode materials for supercapacitor
Carbon quantum dots anchoring MnO2/graphene aerogel exhibits excellent performance as electrode materials for supercapacitor
Read more8Hierarchically porous carbon materials synthesized from sustainable tannic acid with sodium citrate via ice-templating and carbonization for high-performance supercapacitors
Hierarchically porous carbon materials synthesized from sustainable tannic acid with sodium citrate via ice-templating and carbonization for high-performance supercapacitors
Read more8Effect of puffing on electrochemical properties of sorghum seed based porous carbon materials in supercapacitors
Effect of puffing on electrochemical properties of sorghum seed based porous carbon materials in supercapacitors
26Honeycomb-like porous carbon derived from fluorinated magnesium-based metal organic frameworks as an electrode material for supercapacitors
Honeycomb-like porous carbon derived from fluorinated magnesium-based metal organic frameworks as an electrode material for supercapacitors
Read more9Study of electrochemical performance of Ni-BTC MOF as a supercapacitor electrode
Metal-Organic frameworks (MOFs) are the promising electrode materials for the supercapacitors application due to their porous structures and large specific surface area. Here hydrothermal method has been used for the preparation of Ni-MOF for their application as electrode material in supercapacitors. The prepared Ni-MOF material is characterized structurally by using X-ray diffraction (XRD) and Fourier transforms infrared spectroscopy (FTIR). The electrochemical performance of the prepared Ni-MOF material has been studied by using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) in 1M KOH aqueous electrolyte solution. We obtained the different values of specific capacitance at different scan rates and current densities. The prepared Ni-MOF material shows a maximum specific capacitance of 234 F g−1 at a current density of 0.43 A g−1.
Read more208Cherry stones as precursor of activated carbons for supercapacitors
Cherry stones as precursor of activated carbons for supercapacitors
103Electrochemistry of Titanium Carbide MXenes in Supercapacitor.
Novel electrode materials are always explored to achieve better performance of supercapacitors. Titanium carbide MXenes, Ti3 C2 Tx , are one of the very promising candidates for electrode materials in supercapacitors due to their unique structural and ion storage properties as 2D materials. Their large specific surface area, adjustable functionalized surface terminals, high electrical conductivities, hydrophilicity, and high Faradaic capacitance, also known widely but confusingly as pseudocapacitance, are highly desirable for making high-performance electrodes with increased dis-/charging rates and capacities. Herein, some selective electrochemical considerations of Ti3 C2 Tx MXenes for uses in supercapacitors are critically reviewed and assessed, aiming at a better fundamental understanding of the electrochemical basics and processes in Ti3 C2 Tx MXene-based electrode materials for supercapacitor applications.
Read more25Designing MOFs/CuCo-LDHs hybrid-based superhydrophobic sponge for speedy eliminating microplastics, dyes, and oils from high-salinity water
Designing MOFs/CuCo-LDHs hybrid-based superhydrophobic sponge for speedy eliminating microplastics, dyes, and oils from high-salinity water
Read more24Design of hierarchical porous carbon nanofibrous membrane for better electrochemical performance in solid-state flexible supercapacitors
Design of hierarchical porous carbon nanofibrous membrane for better electrochemical performance in solid-state flexible supercapacitors
Read more29Core-shell structured MgCo2O4@Ni(OH)2 nanorods as electrode materials for high-performance asymmetric supercapacitors
Core-shell structured MgCo2O4@Ni(OH)2 nanorods as electrode materials for high-performance asymmetric supercapacitors
2Bioenergy-Byproducts Based Electrodes for Flexible Supercapacitors
Among the various electrochemical energy storage devices, supercapacitor is a significant one due to its high power density, excellent charge/discharge mechanism, and longer lifespan. Supercapacitors have the application in various fields including digital communication devices, electric vehicles, and portable devices. In the recent times, flexible supercapacitors have acquired greater attention due to the higher demands for flexible, wearable, and portable electronic devices. Continuous investigations have been carried out in the past several years on the electrode materials of flexible supercapacitors to achieve excellent electrochemical performance. Among the different electrode materials which have been studied till now, biomass-derived carbon showed potentiality owing to its porous structure, large specific surface area, good chemical stability and electrical properties, low cost, and easy processing. In this chapter, various biomass and biowastes from which carbon materials can be derived were discussed along with the energy storage principle and electrochemical performances of flexible supercapacitor electrodes prepared from these biomass-derived carbons of different precursors.
Read more12Facilely prepared, N, O-codoped nanosheet derived from pre-functionalized polymer as supercapacitor electrodes
Facilely prepared, N, O-codoped nanosheet derived from pre-functionalized polymer as supercapacitor electrodes
74Rationally assembled porous carbon superstructures for advanced supercapacitors
Rationally assembled porous carbon superstructures for advanced supercapacitors
53High performance nanostructured symmetric reduced graphene oxide/polyaniline supercapacitor electrode: effect of polyaniline morphology
High performance nanostructured symmetric reduced graphene oxide/polyaniline supercapacitor electrode: effect of polyaniline morphology
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