Green synthesis of holey graphene sheets and their assembly into aerogel with improved ion transport property

Zang, Peiyu; Gao, Shuangyan; Dang, Liqin; Liu, Zong–Huai; Lei, Zhibin

doi:10.1016/j.electacta.2016.06.146

Cited by 50 publications

(16 citation statements)

References 41 publications

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“…The relatively high gravimetric and areal capacitances can be demonstrated simultaneously for NPGMs‐based supercapacitors, manifesting their good compatibility. The total capacitances of the NPGMs‐based supercapacitors are much higher than most previously reported values for high‐performance porous carbon‐based supercapacitors, such as N1‐GDY//N1‐GDY, HGA//HGA, CNM60‐90//CNM60‐90, KPAC‐800//KPAC‐800, porous graphene//porous graphene, CGNS 3‐1073 //CGNS 3‐1073 , NPGCs‐850//NPGCs‐850, and AGMn‐120 min//AGMn‐120 min (Figure e). The power and energy densities of NPGMs‐based supercapacitors are at a medium level in comparison with some reported carbon‐based supercapacitors, such as A‐ p ‐BC‐ N ‐25//A‐ p ‐BC‐ N ‐25, NPGCs‐850//NPGCs‐850, HPCNC‐700‐a//HPCNC‐700‐a, CGNS 3‐1073 //CGNS 3‐1073 , B/N‐CS//B/N‐CS, PGOCN//PGOCN, HPC//HPC, NDPMC//NDPMC, N1‐GDY//N1‐GDY, SSC‐KOH//SSC‐KOH, and KPAC‐800//KPAC‐800 (Figure f).…”

Section: Resultscontrasting

confidence: 57%

High Capacitive Energy Storage of Nest‐Like Porous Graphene Microspheres Electrode with High Mass Loading

Wang

Song

et al. 2019

ChemSusChem

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Nest‐like porous graphene microspheres (NPGMs) are grown by using a chemical vapor deposition (CVD) method in a fluidized bed reactor from methane and basic magnesium carbonate microspheres (synthesized by a stirring‐induced crystallization approach) as carbon source and template, respectively. The CVD‐derived NPGMs have a few‐layer structure and high electrical conductivity, as well as a three‐dimensional individual macroarchitecture accompanied with well‐developed pore channels and great structural integrity. As the electrode for a symmetric supercapacitor, the effect of different mass loadings for NPGMs‐based electrodes on the capacitive energy‐storage performance is investigated. Superior electrochemical properties with respect to gravimetric, areal, and total capacitances, rate capability, and durability are shown by the NPGMs‐based symmetric supercapacitors, even at mass loadings up to 10 mg cm−2. Moreover, the electrochemical behavior of the NPGMs‐based electrode is much superior to those of two‐dimensional lamella‐like graphene and commercial activated carbon.

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Section: Resultscontrasting

confidence: 57%

High Capacitive Energy Storage of Nest‐Like Porous Graphene Microspheres Electrode with High Mass Loading

Wang

Song

et al. 2019

ChemSusChem

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“…They show a specific capacitance of 175 F g –1 , which is 50% higher than that of the powder form . Comparable capacitance (178 F g –1 at 0.2 A g –1 ) was reported for holey graphene hydrogel which was synthesized in a high oxygen rich solvothermal conditions . Hydrothermal routed Nitrogen‐doped graphene sheets have also good performances as supercapacitor electrode materials.…”

Section: Applications Of Graphene‐based Materials Synthesized From Hymentioning

confidence: 89%

“…A high amount of dissolved O 2 during solvothermal treatment of GO with ethylene glycol and water is found to oxidize the defective carbon atoms of GO sheets. This oxidation creates numerous holes on GO sheets which in turn increases the surface area of the resulting graphene hydrogel …”

Section: Graphene‐based Materials From Subcritical Hydro‐/solvothermamentioning

confidence: 99%

Advances in Subcritical Hydro‐/Solvothermal Processing of Graphene Materials

2017

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Many promising graphene-based materials are kept away from mainstream applications due to problems of scalability and environmental concerns in their processing. Hydro-/solvothermal techniques overwhelmingly satisfy both the aforementioned criteria, and have matured as alternatives to wet-chemical methods with advances made over the past few decades. The insolubility of graphene in many solvents poses considerable difficulties in their processing. In this context hydro-/solvothermal techniques present an ideal opportunity for processing of graphenic materials with their versatility in manipulating the physical and thermodynamic properties of the solvent. The flexibility in hydro-/solvothermal techniques for manipulation of solvent composition, temperature and pressure provides numerous handles to manipulate graphene-based materials during synthesis. This review provides a comprehensive look at the subcritical hydro-/solvothermal synthesis of graphene-based functional materials and their applications. Several key synthetic strategies governing the morphology and properties of the products such as temperature, pressure, and solvent effects are elaborated. Advances in the synthesis, doping, and functionalization of graphene in hydro-/solvothermal media are highlighted together with our perspectives in the field.

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“…Even though the already published GR/CNT film electrodes have shown good capacitive properties, still these characteristics are limited because of the π-π stacking of GR. Hence synthesizing holey graphene (HGR) is a rational idea to remove π-π stacking and produce good capability rates and shorten the ion diffusion path [28][29][30][31] . For instance, Yu et al prepared HGR oxide and its derivative macrostructures which exhibited significantly higher accessible surface area as well as ion diffusion rate as compared to non-holey composites 28 .…”

mentioning

confidence: 99%

Reduced holey graphene oxide film and carbon nanotubes sandwich structure as a binder-free electrode material for supercapcitor

Sammed

Pan

Asif

et al. 2020

Sci Rep

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A novel carbon nanotubes (CNTs) and reduced holey graphene oxide film (RHGOF) sandwich structure has been fabricated to enhance its electrochemical properties. CNTs are grown by a catalyst assisted chemical vapor deposition technique, interpenetrated between the RHGOF layers. A RHGOF/CNTs hybrid film is used as a binder-free supercapacitor electrode. The grown CNTs in the graphene layers structure act as spacers and bridges to increase the counductivity of RHGOF, while the grown CNTs on the surfaces of the graphene contribute to increase the specific surface area of RHGOF. The results demonstrate that the synthesized porous, flexible and binder free hybrid electrode has advantages of higher ion diffusion rate, longer diffusion length and larger ion accessible surface area as compared to the pristine graphene which results in an extra ordinary galvanostatic charge-discharge specific capacitance of 557 F/g at a current density of 0.5 A/g, with excellent rate capabilities and superior cyclic stabilities.In recent era, environment adaptability, portability and compatibility of electronics, hybrid electric vehicles are becoming challenging issues. Energy storage devices having high performance are the part and parcel of these aforementioned devices 1 . Because of its promising adventages, supercapacitor is one of the fascinating energy storage device, such as fast dynamic response, high power density, longer life span and good capability rate 2,3 . Therefore, explicit studies of the characteristics of supercapcitor electrode materials are very essential components that ultimately affect its electrochemical properties 1,4-7 . Most recently, researchers are trying their best to prepare flexible type of electrode materials possessing good cyclic stability, high performance output in terms of charge-discharge rates and specific capacitance.Graphene (GR), being a 2D nano-structured material, has already been acknowledged as an attractive material for supercapacitor electrode. As a single thick sheet of carbon atoms, due to the numerous profound physic-chemical properties,it has been presaged for transfiguring a wide range of technological area [8][9][10][11] . Moreover, it has high unique mechanical flexibility intrinsic electrical conductivity, theoretical gravimetric capacitance of about 550 F/g and remarkably large theoretical surface area of 2630 m 2 /g [11][12][13] . On the contrary, due to the extended π-conjugation in the basal plane, pristine GR has van der Waals forces and π-π interaction. Thus, GR sheets are stacked with each other under these effects. Their irreversible agglomeration not only hinders the ion diffusion rate, but also decreases accessible surface area and consequent reduction in the gravimetric capacitance 14-17 . To improve its capacitive performance, numerous methodologies have already been proposed. For instance, to prevent the restacking, conducting carbon materials as an active channel (such as carbon black, carbon nanotubes (CNTs)) and conducting polymers (such as polyaniline), have been use...

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Green synthesis of holey graphene sheets and their assembly into aerogel with improved ion transport property

Cited by 50 publications

References 41 publications

High Capacitive Energy Storage of Nest‐Like Porous Graphene Microspheres Electrode with High Mass Loading

High Capacitive Energy Storage of Nest‐Like Porous Graphene Microspheres Electrode with High Mass Loading

Advances in Subcritical Hydro‐/Solvothermal Processing of Graphene Materials

Reduced holey graphene oxide film and carbon nanotubes sandwich structure as a binder-free electrode material for supercapcitor

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