Components and Materials for Electrochemical Supercapacitors

Yu, Aiping; Chabot, Victor; Zhang, Jiujun

doi:10.1201/b14671-4

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…2,5,14,15 Due to this and their favorable performance and increased charge storage at the cost of reduced specific power and cycle life compared to EDLCs, pseudo-capacitors have received considerable attention in recent years. 10,16 The most commonly used EC materials which exhibit pseudo-capacitive performance are RuO 2 , MnO 2 , and electronically conducting polymers; 10,17 however, pseudocapacitive performance has also been observed in other transitional metal oxides, 18 nitrides, 10 carbides, 10 and in porous carbons containing heteroatoms. 18,19 This last category of materials is of particular interest for this research as, in addition to pseudocapacitive behavior, the carbonaceous regions of these materials may also act as EDLC-type materials.…”

mentioning

confidence: 99%

The Properties of Carbons Derived through the Electrolytic Reduction of Molten Carbonates under Varied Conditions: Part I. A Study Based on Step Potential Electrochemical Spectroscopy

Hughes¹,

Allen²,

Donne³

2018

J. Electrochem. Soc.

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Carbons have been produced through the electrolytic reduction of molten alkali metal carbonate salts under a range of conditions. The resultant carbons consist of both graphitized and amorphous phases. The carbon surface has also been shown to be heavily functionalized with oxygen containing groups. Their charge storage capabilities as electrochemical capacitor materials have been investigated using cyclic voltammetry and step potential electrochemical spectroscopy (SPECS). Trends in carbon performance with electrodeposition conditions have been identified, and carbons with a specific capacitance as high as 375 F.g −1 have been obtained at scan rates of 10 mV.s −1 . With respect to temperature of carbon deposition, carbon electrodeposited at 500 • C has been identified as the best electrical double layer capacitor type material, and as a superior material for pseudocapacitive applications. The performance of a control activated carbon has been compared with the electrodeposited carbons, and it has been shown that, when electrodeposited at low current densities, the resultant carbon performance is superior to the activated carbon.

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confidence: 99%

The Properties of Carbons Derived through the Electrolytic Reduction of Molten Carbonates under Varied Conditions: Part I. A Study Based on Step Potential Electrochemical Spectroscopy

Hughes¹,

Allen²,

Donne³

2018

J. Electrochem. Soc.

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“…The 6.0 M KOH solution was used as the electrolyte. Although organic electrolytes have the advantage of broadening the potential operating windows (up to 4 V), only an aqueous KOH electrolyte was used in this work due to its cost-effectiveness, longer cycle life, less internal resistivity, inflammability, and lower hazard level . Before electrochemical measurements, the active materials were vacuum-infiltrated by the electrolyte to access electrolyte ions on the material’s surface.…”

Section: Materials Characterizationsmentioning

confidence: 99%

Ultrafast Graphitization and Reduction of Spongy Graphene Oxide by Low-Energy Electromagnetic Radiation to Boost the Performance and Stability of Carbon-Based Supercapacitors

Saeidi

Lee

Okello

et al. 2021

ACS Appl. Energy Mater.

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Interest in carbon nanomaterials for energy storage systems such as supercapacitors has enormously risen due to their attractive electrical conductivity, chemical inertness, and charge storage capacity. The reduction of graphitic oxide is a versatile procedure to prepare 3D graphene. Despite many green methods, the dynamics behind ultrafast thermal graphitization have remained elusive. Here, we demonstrate an effort to understand the graphitization mechanism of graphitic oxide under ultrafast thermal reduction induced by electromagnetic radiation and probably via Ar+ cation collisions. The low photon energy (10.5 μeV) locally removes oxygen functionalities and restores the π-conjugated structures. A graphitic structure with low-defect, long-range order, and relatively high electrical conductivity (8.7 S cm–1) is attained at a short photoinduced time (15 s) and relatively low power (1000 W) after a hydrothermal reduction at 160 °C for 2 h. We demonstrate that the prepared spongy graphene structure microwaved for 13 s is an active charge storage material with a specific capacitance of 226.4 F g–1 at 1 A g–1, an ultrahigh rate capability of 85.1% in the range of 0.2–50 A g–1, and a capacitance stability of 120% after 10,000 cycles at 1 A g–1. The ultrafast photoreduction of graphitic oxide for the mass production of graphene sponges paves the way for fabricating functional materials by tailoring oxygenated functional groups for multiple applications.

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Components and Materials for Electrochemical Supercapacitors

Cited by 2 publications

References 29 publications

The Properties of Carbons Derived through the Electrolytic Reduction of Molten Carbonates under Varied Conditions: Part I. A Study Based on Step Potential Electrochemical Spectroscopy

The Properties of Carbons Derived through the Electrolytic Reduction of Molten Carbonates under Varied Conditions: Part I. A Study Based on Step Potential Electrochemical Spectroscopy

Ultrafast Graphitization and Reduction of Spongy Graphene Oxide by Low-Energy Electromagnetic Radiation to Boost the Performance and Stability of Carbon-Based Supercapacitors

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