Besides, the symmetric supercapacitor based on PTCDA/rGO film electrodes delivers a gravimetric energy density of 19.7 Wh kg −1 at an ultra-high gravimetric power density of 45 kW kg −1, and the zinc-ion hybrid supercapacitor based on PTCDA/rGO cathode delivers an extremely high gravimetric energy density of 120.5

High density and high ion conductivity are usually incompatible but highly needed for compact, high-power capacitive energy storage. Herein, we demonstrate a

Direct methanol fuel cells have drawn great attention recently due to their high energy density, low pollutant emission, ease of handling the liquid, and low

The electrochemical properties and high-density energy storage performance of graphene nano-platelet-based solid-state electrical double-layer supercapacitor device are reported. The graphene device is fabricated with electrolyte comprising of 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) room

Hydrogen can be stored as solid, liquid or gas. The volumetric energy density of hydrogen can be improved either by storing it at low temperature and high pressure or adsorbing it on highly porous structures [11] can be stored in high pressure gas cylinders but the high pressure in the cylinders followed by the high degree of

Despite high power density, fast charging/discharging rate, and long operational lifetime, large-scale application of supercapacitor (SC) is limited by its intrinsically low energy densities (of 5–8 Wh kg −1 (gravimetric) and 5–8 Wh L −1 (volumetric)), which are at least 10-fold lower than battery. Since the invention of

Herein, we propose an advanced energy-storage system: all-graphene-battery. It operates based on fast surface-reactions in both electrodes, thus delivering a remarkably high power density of 6,450

According to the energy storage theory U = 1 2 ε ′ ε 0 E b 2, the energy storage density of dielectric materials is proportional to their dielectric constant (ε′) and breakdown strength (E b). Incorporating high-dielectric ceramic particles into polymer matrix can effectively enhance the dielectric constant of the composite materials [5

In pursuing higher energy density with no sacrifice of power density, a supercapacitor-battery hybrid energy storage device—combining an electrochemical double layer capacitance (EDLC) type positive electrode with a Li-ion battery type negative electrode —has been designed and fabricated. Graphene is introduced to both electrodes: an Fe 3

1. Introduction. Progress in technological energy sector demands the use of state-of-the-art nanomaterials for high performance and advanced applications [1].Graphene is an exceptional nanostructure for novel nanocomposite designs, performance, and applications [2].Graphene has been found well known for low weight,

Hybrid electrodes, by integrating the metal oxides/hydroxides or conductive polymers with graphene, is highly recommended to overcome the low energy

1. Introduction. Supercapacitors or ultracapacitors have attracted considerable recent attentions due to their high power density, high charge/discharge rates, and long cycle life performance [1], [2], [3].They are considered as one of the most promising electrochemical energy storage devices, having a potential to complement or

Highly packed films of reduced graphene oxide and sugar-based carbon nanospheres (CNSs) were prepared by a simple hydrothermal treatment. Under hydrothermal conditions, graphene oxide was partially reduced and self-assembled forming a monolith that effectively embedded the CNSs. The spheres were homogeneousl

Environment safe, cost-effective, reusable and portable asymmetric solid-state supercapacitor (ASSC) device, working at higher operating potential with high energy density was the challenging criteria for practical application. To satisfy all these we fabricated the ASSC device with boron doped reduced graphene (BRG) as positive and

A high-performance supercapacitor-battery hybrid energy storage device based on graphene-enhanced electrode materials with ultrahigh energy density. Energy & Environ. Sci. 6,

Dielectric materials with high dielectric permittivity (ε r), low dielectric loss, high breakdown strength (E b) and hence high electric energy density (U e), are of critical importance in modern electronics devices and high-charge storage capacitors in recent years [1,2,3,4,5,6,7].Currently, polymers were widely chosen as dielectric materials,

The energy storage density (U e ), energy loss (U l ), and charge-discharge efficiency (η) are expressed as: U e ¼ ∫ P max P r EdD, U l ¼ ∫ P r 0 EdD and η ¼ U e =ðU e þ U l Þ

A high-performance graphene aerogel (GA)-based composite sorbent is synthesized for STB by confining calcium chloride inside a GA matrix Integrated heat and cold storage enabled by high-energy-density sorption thermal battery based on zeolite/MgCl2 composite sorbent. Journal of Energy Storage 2023, 64, 107155.

In order to develop energy storage devices with high power and energy densities, electrodes should hold well-defined pathways for efficient ionic and electronic transport. Herein, we demonstrate high-performance supercapacitors by building a three-dimensional (3D) macroporous structure that consists of chemically modified graphene

Synthesis of high-surface-area graphene oxide for application in next-generation devices is still challenging. In this study, we present a simple and green-chemistry procedure for the synthesis of

High energy density, together with stable and repeatable performance of the wearable device for 10000 cycles of charge-discharge and 5000 cycles of bending, signifies the importance of the as-developed device for practical wearable applications. The energy storage electrodes of perforated graphene can offer easy ion transportation

These excellent electrochemical performances, especially high-rate capability and ultralong cycle life (Fig. 3, G and H), promise a new generation of energy storage system that can sustainably keep constant and stable energy density while providing high power delivery and uptake (energy density of ~66 Wh kg −1 with highest

The electrochemical behavior of graphene sheets in energy storage system is closely related to its electronic structures. Specifically, structural vacancy defects can expose more active sites and enhance the electrochemical performance. In addition, the as-assembled Zn ion hybrid supercapacitors exhibit a high energy density of 129.9

Graphene-based materials have many highly appealing properties. First, its high surface area of up to 2600 m 2 g -1 and high porosity makes it ideal for gas absorption and electrostatic charge storage. [3] Second, it is extremely lightweight and strong which allows it to be easily transported. Third, it is a potent conductor of electrical and

The fully printed FZG-MSCs deliver a high areal energy density of 9.5 μWh/cm 2 nanogenerators), energy storage devices (e.g., micro-batteries, micro uniformly anchored on graphene nanosheets (FZG) with high specific surface area (363 m 2 /g), abundant electrochemical active sites, and outstanding electrical conductivity, for

A high density of 1.33 g cm −3 was obtained, almost double that of traditional porous carbons, and the material showed a tremendous electrochemical performance with a high volumetric energy density of 59.5 Wh L –1 in supercapacitors. Carbon nanotubes can also be used as spacers to prepare a dense graphene/multi-wall

Synthesis of high-surface-area graphene oxide for application in next-generation devices is still challenging. In this study, we present a simple and green-chemistry procedure for the synthesis of oxygen-enriched graphene materials, having very large surface areas compared with those reported for powdered graphene-related solids.

1 INTRODUCTION. Energy storage is a vital component of our contemporary technology, and it is intrinsically associated with the rising demands for devices that can store energy effectively and sustainably. 1-6 Batteries play a significant role in energy storage, and the development of better batteries is a continuous focus of

Massive fabrication of graphene with high density and high ion conductivity has been a long-standing challenge for energy storage communities. Here, inspired by the turbostratic aligning of tea leaves in boiling water, we propose a new design of turbostratic graphene formed following turbulent flow and densified by isotropic

Graphene-based materials possess large specific surface area, good adsorption kinetics, low density, high chemical stability and reversible hydrogen storage, which is a potential candidate in many

In order to develop energy storage devices with high power and energy densities, electrodes should hold well-defined pathways for efficient ionic and electronic

Recently, the fabrication of high-performance graphene films as electrode materials become a research tendency for flexible energy-storage devices. Here, we successfully prepare iodine-doped reduced graphene oxide (I-rGO) films with excellent capacitive performance by a simple and versatile technique of iodine steam doping.

1. Introduction. Electrochemical supercapacitors (SCs) are highly safe energy storage devices that bridge the gap between high-energy batteries and high-power dielectric capacitors, and show genuine potential in many important applications, including portable electronics, energy backup power devices and hybrid vehicles [1], [2].They can

All of these reports show promising electrochemical performance for graphene-supported carbon electrodes, specifically in terms of high peak current