Dynamic Electrosorption Analysis as an Effective Means to Characterise the Structure of Bulk Graphene Assemblies
Identifieur interne : 002C73 ( Main/Merge ); précédent : 002C72; suivant : 002C74Dynamic Electrosorption Analysis as an Effective Means to Characterise the Structure of Bulk Graphene Assemblies
Auteurs : Junwu Zhu [Australie, République populaire de Chine] ; Chi Cheng [Australie] ; Xiaowei Yang [Australie] ; Yufei Wang [Australie] ; Ling Qiu [Australie] ; Dan Li [Australie, États-Unis]Source :
- Chemistry – A European Journal [ 0947-6539 ] ; 2013-02-25.
English descriptors
- KwdEn :
- Accessible surface area, Adsorption, Ambient conditions, Annealed, Annealing, Aqueous solution, Assembly structure, Average pore size, Bulk forms, Bulk graphene assemblies, Bulk materials, Capacitance, Capacitance values, Carbon materials, Cellulose esters filter membrane, Certain amount, Characterisation, Characteristic relaxation time, Chem, Corrugation, Current density, Different level, Different temperatures, Dynamic electrosorption analysis, Effective method, Electrochemical, Electrochemical impedance spectroscopy, Electrolyte, Electrosorption, Elementary analysis, Emimbf4, Energy environ, Experimental design, Films annealed, Filter membrane, Filtration, Financial support, Frequency response, Ftir results, Full paper, Gmbh, Good agreement, Graphene, Graphene assemblies, Graphene films, Graphene oxide, Graphene product, Graphene sheets, Gravimetric capacitances, Hydrothermal, Hydrothermal treatment, Identical chemical structure, Kgaa, Liquid phase, Mater, Model system, Multilayered, Nano lett, Operation rate, Operation rates, Other hand, Pore, Pore size, Pore structure, Porous carbon, Porous structure, Power density, Quantitative manner, Restacking, Same amount, Samples annealed, Samples drop, Similar procedure, Structural difference, Structural variation, Subtle variation, Supercapacitors, Surface area, Thermal annealing, Vacuum filtration, Various hydrothermal temperatures, Various temperatures, Verlag, Verlag gmbh, Weinheim, Weinheim chem.
- Teeft :
- Accessible surface area, Adsorption, Ambient conditions, Annealed, Annealing, Aqueous solution, Assembly structure, Average pore size, Bulk forms, Bulk graphene assemblies, Bulk materials, Capacitance, Capacitance values, Carbon materials, Cellulose esters filter membrane, Certain amount, Characterisation, Characteristic relaxation time, Chem, Corrugation, Current density, Different level, Different temperatures, Dynamic electrosorption analysis, Effective method, Electrochemical, Electrochemical impedance spectroscopy, Electrolyte, Electrosorption, Elementary analysis, Emimbf4, Energy environ, Experimental design, Films annealed, Filter membrane, Filtration, Financial support, Frequency response, Ftir results, Full paper, Gmbh, Good agreement, Graphene, Graphene assemblies, Graphene films, Graphene oxide, Graphene product, Graphene sheets, Gravimetric capacitances, Hydrothermal, Hydrothermal treatment, Identical chemical structure, Kgaa, Liquid phase, Mater, Model system, Multilayered, Nano lett, Operation rate, Operation rates, Other hand, Pore, Pore size, Pore structure, Porous carbon, Porous structure, Power density, Quantitative manner, Restacking, Same amount, Samples annealed, Samples drop, Similar procedure, Structural difference, Structural variation, Subtle variation, Supercapacitors, Surface area, Thermal annealing, Vacuum filtration, Various hydrothermal temperatures, Various temperatures, Verlag, Verlag gmbh, Weinheim, Weinheim chem.
Abstract
Restacking of graphene sheets to a graphite‐like structure is a prevailing problem that is known to compromise the performance of individual graphene sheets in an assembled bulk form. To address this common problem efficiently and monitor the structure and quality of graphene products comprehensively, it is highly desirable to develop reliable metrology techniques for characterising graphene‐based materials on a bulk assembly level and in a quantitative manner. Here, by revisiting the physicochemical principle of electrosorption, we propose a simple electrochemical approach, namely dynamic electrosorption analysis (DEA), as an easily accessible and effective technique for evaluation of the self‐stacking behaviour of graphene. Taking multilayered chemically converted graphene films as a model, we demonstrate that the DEA technique can effectively reveal very subtle variation in accessible surface area and pore size of graphene assemblies in the liquid phase and thus can provide useful insights to the experimental design relating to restacking control. This work also reveals the huge effect some routine processing conditions, such as heat treatment and drying, can have on the structure and performance of graphene‐based bulk materials, providing useful guidance for future manufacturing of this class of materials.
Url:
DOI: 10.1002/chem.201203219
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<term>Aqueous solution</term>
<term>Assembly structure</term>
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<term>Corrugation</term>
<term>Current density</term>
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<term>Dynamic electrosorption analysis</term>
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<term>Annealed</term>
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<term>Aqueous solution</term>
<term>Assembly structure</term>
<term>Average pore size</term>
<term>Bulk forms</term>
<term>Bulk graphene assemblies</term>
<term>Bulk materials</term>
<term>Capacitance</term>
<term>Capacitance values</term>
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<term>Cellulose esters filter membrane</term>
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<term>Characteristic relaxation time</term>
<term>Chem</term>
<term>Corrugation</term>
<term>Current density</term>
<term>Different level</term>
<term>Different temperatures</term>
<term>Dynamic electrosorption analysis</term>
<term>Effective method</term>
<term>Electrochemical</term>
<term>Electrochemical impedance spectroscopy</term>
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<term>Electrosorption</term>
<term>Elementary analysis</term>
<term>Emimbf4</term>
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<term>Experimental design</term>
<term>Films annealed</term>
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<term>Graphene films</term>
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<term>Graphene sheets</term>
<term>Gravimetric capacitances</term>
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<term>Hydrothermal treatment</term>
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<term>Kgaa</term>
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<term>Model system</term>
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<term>Operation rate</term>
<term>Operation rates</term>
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<term>Pore</term>
<term>Pore size</term>
<term>Pore structure</term>
<term>Porous carbon</term>
<term>Porous structure</term>
<term>Power density</term>
<term>Quantitative manner</term>
<term>Restacking</term>
<term>Same amount</term>
<term>Samples annealed</term>
<term>Samples drop</term>
<term>Similar procedure</term>
<term>Structural difference</term>
<term>Structural variation</term>
<term>Subtle variation</term>
<term>Supercapacitors</term>
<term>Surface area</term>
<term>Thermal annealing</term>
<term>Vacuum filtration</term>
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<front><div type="abstract" xml:lang="en">Restacking of graphene sheets to a graphite‐like structure is a prevailing problem that is known to compromise the performance of individual graphene sheets in an assembled bulk form. To address this common problem efficiently and monitor the structure and quality of graphene products comprehensively, it is highly desirable to develop reliable metrology techniques for characterising graphene‐based materials on a bulk assembly level and in a quantitative manner. Here, by revisiting the physicochemical principle of electrosorption, we propose a simple electrochemical approach, namely dynamic electrosorption analysis (DEA), as an easily accessible and effective technique for evaluation of the self‐stacking behaviour of graphene. Taking multilayered chemically converted graphene films as a model, we demonstrate that the DEA technique can effectively reveal very subtle variation in accessible surface area and pore size of graphene assemblies in the liquid phase and thus can provide useful insights to the experimental design relating to restacking control. This work also reveals the huge effect some routine processing conditions, such as heat treatment and drying, can have on the structure and performance of graphene‐based bulk materials, providing useful guidance for future manufacturing of this class of materials.</div>
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