Coal-based double-layer capacitors
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According to the storage mechanism, the supercapacitors can be classified into two categories, electric double layer capacitor (EDLC) and pseudocapacitor [7]. EDLC shows that the double layer is formed at the electrode/electrolyte interface to storage energy, while pseudocapacitor exhibits the reversible redox reaction in the …
Preparation of porous carbons by hydrothermal carbonization and …
According to the storage mechanism, the supercapacitors can be classified into two categories, electric double layer capacitor (EDLC) and pseudocapacitor [7]. EDLC shows that the double layer is formed at the electrode/electrolyte interface to storage energy, while pseudocapacitor exhibits the reversible redox reaction in the …
Preparation of layered-porous carbon from coal tar pitch narrow ...
1. Introduction. With the rapid consumption of fossil energy and the fast-growing of energy demand, the development of renewable energy was greatly promoted [1], [2] this context, portable energy storage devices and new energy storage technologies were widely explored [3].Electric double layer capacitor (EDLC), an environmentally …
Performance of C/C electric double layer capacitors with coal …
Coal-based active carbon was prepared and used as electrodes of electric double-layer capacitors (EDLCs). The performance of EDLCs using active carbon …
Coal-based 3D hierarchical porous carbon aerogels for high
Coal-based 3D hierarchical porous carbon aerogels for ...
The synthesis and performance analysis of various biomass‐based …
Biomass is one of the most promising clean energy sources. The porous carbon materials prepared by biomass as electrode materials of electric double-layer capacitors (EDLCs) are easily available at a low price, which would greatly reduce the cost of the production.
Hierarchical porous carbon derived from carboxylated …
Hierarchical porous carbons have been synthesized using amphiphilic carboxylated coal-tar pitch as a precursor via a simple KOH activation process. Amphiphilic carboxylated coal-tar pitch has a high …
Coal-derived N,O co-doped mesoporous carbon as electrode …
A symmetric electric-double layer capacitor (EDLC) and a zinc-ion hybrid supercapacitor (ZHS) based on N/O-DMCC electrode are assembled to achieve high energy densities of 23.1 Wh kg⁻¹ (at 500 ...
Performance of C/C electric double layer capacitors with coal …
Abstract Coal-basedactivecarbonwaspreparedandusedas electrodes of electric double-layer capacitors (EDLCs). The performance of EDLCs using active carbon electrodes …
Hierarchical porous carbon derived from carboxylated coal-tar …
1. Introduction With the fast-growing demands for novel and high-efficiency energy-storage devices, supercapacitors (or electrochemical capacitors) have stimulated extensive interest due to their advantages of high-power capability, superior reversibility and long life cycle. 1–3 On the basis of different energy storage mechanisms, supercapacitors …
Activated Carbons and Their Evaluation in Electric Double Layer Capacitors
The energy stored in electric double-layer capacitors (EDLCs) is related to the electrostatic attraction of ions on the surface of the two electrodes immersed in an electrolyte. ... and no porosity development occurs. The bituminous coal-based char is more reactive, and as a result, a BET surface area of 2930 m 2 g −1 was obtained immediately ...
Coal-derived N,O co-doped mesoporous carbon as
A symmetric electric-double layer capacitor (EDLC) and a zinc-ion hybrid supercapacitor (ZHS) based on N/O-DMCC electrode are assembled to achieve high energy densities of 23.1 Wh kg −1 (at 500 W kg −1) and 347.0 Wh kg −1 (at 175.5 W kg −1), respectively, strongly demonstrating the huge potential of coal-derived carbon materials …
A new double layer super-capacitor made by free-standing …
With the idea of developing cost-effective and good performing Electrochemical Double Layer Capacitors (EDLCs), a symmetric device based on a low-cost coal derived carbon (F400) and highly concentrated AcK solutions as electrodes and electrolytes, respectively, was fabricated and optimized.
Preparation of layered-porous carbon from coal tar pitch narrow ...
Electric double layer capacitor (EDLC), an environmentally friendly and promising energy storage device, had attracted more attention due to its relatively high power density, fast charge and discharge capacity and long cycle life [4], [5], [6]. ... High-yield preparation of coal tar pitch based porous carbon via low melting point fire ...
Performance of C/C electric double layer capacitors with coal-based ...
Coal-based active carbon was prepared and used as electrodes of electric double-layer capacitors (EDLCs). The performance of EDLCs using active carbon electrodes with different pore structure was ...
Effect of oxygen-containing functional groups on the ...
The surface chemistry of activated carbon was treated with sulfuric acid and hydrogen to analyze the oxygen-containing functional groups on the impedance behavior of electric double-layer capacitors. Based on the electrochemical impedance spectrum (EIS), an equivalent circuit model was proposed considering the kinetic and …
Preparation of layered-porous carbon from coal tar pitch narrow ...
DOI: 10.1016/j.jcis.2020.02.022 Corpus ID: 211158664; Preparation of layered-porous carbon from coal tar pitch narrow fractions by single-solvent extraction for superior cycling stability electric double layer capacitor application.
Preparation of mesoporous carbon microsphere/activated carbon composite ...
Key Words: Mesoporous carbon microsphere, activated carbon, electrode material, electric double-layer capacitor 1 Introduction Based on the formation of an electric double layer at the electrode-electrolyte interface, electric double-layer capacitors (EDLCs) exhibit many distinguished properties, such as high power density, …
Activated Carbons and Their Evaluation in Electric Double Layer …
This review presents a summary of the manufacturing of activated carbons (ACs) as electrode materials for electric double layer capacitors. Commonly used …
Hierarchical porous carbon derived from carboxylated coal …
carboxylated coal-tar pitch for electrical double-layer capacitors Haiyang Wang, ab Hongzhe Zhu, b Yixuan Li,b Debang Qi,a Shoukai Wang*b and Kaihua Shen*a Hierarchical porous carbons have been synthesized using amphiphilic carboxylated coal-tar pitch as a precursor via a simple KOH activation process. Amphiphilic carboxylated coal-tar pitch ...
Capacitance of carbon-based electrical double-layer capacitors
Experimental electrical double-layer capacitances of porous carbon electrodes fall below ideal values, thus limiting the practical energy densities of carbon-based electrical...
Pore structure and the properties of electric double layer capacitor ...
Bamboo-derived activated carbon prepared by superheated steam (BAC) exhibited performance for utilization as an electric double layer capacitor (EDLC) electrode. Pore structure and EDLC performances were investigated by comparison with phenol resin-derived activated carbon (MSP-20), which is commercially available and …
Characterization and organic electric-double-layer-capacitor ...
The electric double-layer capacitor (EDLC) is an energy storage device that has fast charge–discharge, outstanding power density, and life cycle. EDLC can …
Revisiting the performance of electrical double-layer capacitors ...
A maximum cell potential of 2.3 V has been claimed in the literature for an electrical double-layer capacitor (EDLC) in 17 mol kg −1 NaClO 4 water-in-salt (WIS) electrolyte. Puzzled by this high cell potential compared to e.g., 1.8 V for an EDLC in 20 mol kg −1 LiTFSI, and by the fact that the high electrochemical stability window (ESW) values …
KOH activation of a HyperCoal to develop activated carbons for …
A series of activated carbons (ACs) was prepared from HyperCoal by conventional and direct KOH activation methods, and was used as electrodes in electric double-layer capacitors (EDLCs) using 0.5 M TEABF 4 /PC as the electrolytic solution. The effects of carbonization temperature (CT), activation temperature (AT) and …
Materials for electrochemical capacitors
Electrochemical capacitors, also called supercapacitors, store energy using either ion adsorption (electrochemical double layer capacitors) or fast surface redox reactions (pseudo-capacitors).
Perspectives for electrochemical capacitors and related devices
We describe electrical double-layer capacitors based on high-surface-area carbons, pseudocapacitive materials such as oxides and the two-dimensional inorganic compounds known as MXenes, and ...
Preparation of carbon electrodes from alkaline extraction of lignite ...
Figure 10b is a GCD curve of the AE in a button-type double-layer capacitor configuration at different current densities, ... Effect of pore size distribution of coal-based activated carbons on double layer capacitance. Electrochim Acta 50:1197–1206. Article CAS Google Scholar ...
Performance of C/C electric double layer capacitors with coal …
to make an electric double layer on the surface of elec- trode materials [10, 13].AsshowninTable1,AC3has larger surface area than AC2 mainly due to contribution
Hierarchical porous carbon derived from carboxylated coal-tar …
Thus, hierarchical porous carbons derived from amphiphilic-carboxylated coal-tar pitch represent a promising electrode material for electrical double-layer capacitors. The specific capacitance of the HPC-2 electrode retention of 93.9% was obtained after 10 000 cycles, indicating good electrochemical stability.
Capacitance of carbon-based electrical double-layer capacitors
Experimental electrical double-layer capacitances of porous carbon electrodes fall below ideal values, thus limiting the practical energy densities of carbon-based electrical double-layer capacitors.
Performance of C/C electric double layer capacitors with coal-based ...
Coal-based active carbon was prepared and used as electrodes of electric double-layer capacitors (EDLCs). The performance of EDLCs using active carbon electrodes with different pore structure was studied, including cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. With an …
Porous carbon nanosheets from coal tar pitch for zinc ion hybrid capacitor
As a by-product of coal chemical industry, it is very suitable to be used as carbon precursor to prepare carbon materials because of its rich aromatic hydrocarbons. However, the preparation of carbon materials often uses a lot of metal oxides and strong alkali, which will not only cause corrosion to the equipment, but also produce wastewater. …
Capacitance of carbon-based electrical double-layer …
We studied the EDL capacitance of these planar graphene electrodes in a 6 M potassium hydroxide aqueous electrolyte. The single …
Influence of Particle Size Distribution on the Performance of Ionic ...
Electrochemical double layer capacitors (EDLCs) employing ionic liquid electrolytes are the subject of much research as they promise increased operating potentials, and hence energy densities ...
Performance of C/C electric double layer capacitors with coal …
With an increase of sodium hydrate/coal ratio, the pore structure of active carbon is greatly improved, resulting in larger double-layer capacitance. The capacitance …