Synthesis and characterization of graphene hollow spheres for application in supercapacitors

Shao, Qingguo; Tang, Jie; Lin, Yuexian; Zhang, Feifei; Yuan, Jinshi; Zhang, Han; Shinya, Norio; Qin, Lu Chang

doi:10.1039/c3ta12789c

Cited by 86 publications

(34 citation statements)

References 32 publications

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“…Graphene, a single layer graphite with closely packed conjugated hexagonal lattices, has become a promising candidate for a broad range of applications due to its superior conductivity, large specific surface area, excellent mechanical flexibility, and high chemical stability [19][20][21][22][23]. Moreover, it not only presents high catalytic activity, longterm stability, and excellent physical and chemical properties but also contains the advantages of low cost and environment-friendliness [24].…”

Section: Introductionmentioning

confidence: 99%

Enhanced electrocatalytic performance toward oxygen reduction in an alkaline medium by anchoring cobalt tetraferrocenylphthalocyanine onto graphene

et al. 2014

J Appl Electrochem

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A novel non-noble-metal electrocatalyst, abbreviated as CoFcPc/PSS-Gr, was fabricated through a solvothermally assisted p-p assembling approach by anchoring cobalt tetraferrocenylphthalocyanine (CoFcPc) onto poly(sodium-p-styrenesulfonate) modified graphene (PSS-Gr). The as-prepared hybrid was characterized by scanning electron microscopy, transmission electron microscopy, UV-Vis absorption spectroscopy, and X-ray photoelectron spectroscopy. Cyclic voltammetry, rotating disk electrode, and rotating ring-disk electrode measurements were employed to investigate the kinetics and mechanism of the ORR on the CoFcPc/PSS-Gr electrode. Besides, the chronoamperometric measurements were utilized to evaluate the stability of the CoFcPc/PSS-Gr composite in an alkaline solution. The obtained results demonstrated that CoFcPc supported on PSS-Gr showed good tolerance to methanol crossover, high kinetic current density (9.51 mA cm -2 ), high stability (84.6 % after 10,000 s), and an almost four-electron transfer process in an alkaline medium.

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Section: Introductionmentioning

confidence: 99%

Enhanced electrocatalytic performance toward oxygen reduction in an alkaline medium by anchoring cobalt tetraferrocenylphthalocyanine onto graphene

et al. 2014

J Appl Electrochem

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“…[21][22][23] For example, we have recently reported that graphene-based electrodes could exhibit high energy densities of 80-150 Wh kg -1 in IL electrolyte. [24][25][26][27][28] However, apart from the relatively high cost, there still exists another obstacle for the application of IL as the electrolyte for supercapacitors. Compared with aqueous electrolytes, ILs usually have larger molecules, lower conductivity, and higher viscosity, graphene supercapacitors often exhibit lower rate capability.…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid modified graphene for supercapacitors with high rate capability

Shao

Tang

Lin

et al. 2015

Electrochimica Acta

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Ionic liquid modified graphene for supercapacitors with high rate capability, Electrochimica Acta http://dx. Graphical abstractHighlights  Ionic liquid is used to functionalize the graphene electrodes of supercapacitor;  Treated electrodes become more compatible with the same electrolyte;  Rate capability is improved with the treated graphene electrodes. Abstract:Ionic liquids (ILs) with large electrochemical windows up to 4 V have been employed as the electrolyte to boost the energy density of graphene-based supercapacitors.However, due to the larger molecular size, lower conductivity, and higher viscosity of the IL electrolyte, graphene-based supercapacitors in IL electrolyte usually exhibit 2 low rate capability. To make graphene-based electrodes more compatible with the IL electrolyte, we functionalized chemically reduced graphene oxide with the same IL which is also used as the electrolyte. Electrochemical test results show that the relaxation time and charge transfer resistance at electrode-electrolyte interface for IL modified electrode is one third and one fourth of that for the pristine graphene electrode, respectively, indicating the improved compatibility between the IL modified electrode and the electrolyte. Furthermore, the capacitance retention of the IL modified electrode from current density of 0.5 to 20 A g -1 is 85 %, which is much higher than that of the pristine electrode (53%).

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“…Despite the advantages of graphene, it suffers from the serious agglomeration and restacking of neighboring graphene sheets due to van der Waals interactions [24]. Rational design of structure such as porous graphene [25], hierarchical sandwich-type graphene [26] and graphene hollow sphere [27,28] has been proven to be a good way to prevent the agglomeration of graphene and maintain its inherent properties.…”

Section: Introductionmentioning

confidence: 99%

FeCo2O4/hollow graphene spheres hybrid with enhanced electrocatalytic activities for oxygen reduction and oxygen evolution reaction

Yan

Yang

Bian

et al. 2015

Carbon

142

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Synthesis and characterization of graphene hollow spheres for application in supercapacitors

Cited by 86 publications

References 32 publications

Enhanced electrocatalytic performance toward oxygen reduction in an alkaline medium by anchoring cobalt tetraferrocenylphthalocyanine onto graphene

Enhanced electrocatalytic performance toward oxygen reduction in an alkaline medium by anchoring cobalt tetraferrocenylphthalocyanine onto graphene

Ionic liquid modified graphene for supercapacitors with high rate capability

FeCo2O4/hollow graphene spheres hybrid with enhanced electrocatalytic activities for oxygen reduction and oxygen evolution reaction

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