Oxygen functional groups and electrochemical capacitive behavior of incompletely reduced graphene oxides as a thin-film electrode of supercapacitor

Oh, Young J.; Yoo, Jung Joon; Kim, Yong Il; Yoon, Jae Kook; Yoon, Hyung Chul; Kim, Jong-Huy; Park, Seung Bin

doi:10.1016/j.electacta.2013.11.040

Cited by 598 publications

(306 citation statements)

References 44 publications

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“…Other peaks at ca. 1226 and 1083 cm −1 correspond to C-O-C and C-O groups, respectively [26]. The peaks at 3352, 1361, 1226, and 1083 cm −1 in the rGO and the rGO-CNT patterns appear to be mitigated, which indicates that GO was thermally reduced after the deposition.…”

Section: Resultsmentioning

confidence: 94%

Electrostatically Sprayed Reduced Graphene Oxide-Carbon Nanotubes Electrodes for Lithium-Ion Capacitors

Adelowo¹,

Baboukani²,

Chen³

et al. 2018

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Lithium-ion capacitors (LICs) comprising capacitor-type and battery-type electrodes are promising electrochemical energy storage systems to effectively combine the merits of lithium-ion batteries (LIBs) and electrochemical capacitors (ECs). It is expected that the energy density of LICs can be improved by utilizing electrodes that are capable of providing high specific capacity. Herein, we demonstrate a graphene-based LIC with reduced graphene oxide-carbon nanotube (rGO-CNT) film as capacitor-type electrode and pre-lithiated rGO-CNT film as battery-type electrode using 1 M LiPF 6 in EC: EMC electrolyte. The rGO-CNT was prepared by electrostatic spray deposition (ESD), which offers advantages, such as simultaneous reduction and binder-free deposition of GO on a current collector and facile morphology control. The rGO-CNT shows high specific capacity and good cyclability as both capacitor-type and battery-type electrode materials. The rGO-CNT//lithiated rGO-CNT LIC delivered energy densities as high as 114.5 Wh kg −1 and maximum power density of 2569 W kg −1 . This indicates the promising potential of the ESD approach for the facile fabrication of graphene-based electrodes for high performance LICs.

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Section: Resultsmentioning

confidence: 94%

Electrostatically Sprayed Reduced Graphene Oxide-Carbon Nanotubes Electrodes for Lithium-Ion Capacitors

Adelowo¹,

Baboukani²,

Chen³

et al. 2018

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show abstract

“…An increase of the specific capacitance of both electrodes can be seen. Some researchers show no influence of oxygen groups on the capacitance of the material in neutral electrolyte, indicating a lack of faradic reactions that can occur on the electrode material [11]. In the conducted measurements, the increase of the capacitance of both positive and negative electrodes can be connected with the overall level of oxygen content in the material.…”

Section: Characterisation In 1 M Na 2 Somentioning

confidence: 83%

“…One of the modifying methods is oxidation with the ammonium persulfate solution [12,24,25]. In the literature, it is noted that the oxidation conditions, including concentration, time and temperature, have a significant influence on the physicochemical properties of the obtained modified, activated carbon [11]. This modification mainly introduces the oxygen-containing functional groups into the surface of the carbon without extreme changes in the surface area and pore structure, in opposite to the HNO 3 modification [23] which is unprofitable in a supercapacitor application.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the occurrence of functional groups on the surface of the electrode material and their character has high impact on the whole device. It can be found that the oxygen and nitrogen functional groups are the most commonly studied in the context of the electrochemical performance of materials [8,[11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…It was determined that the described modification processes are longer than 6 h, and the attention was put on the increase of acid groups on the surface of the carbon because they were used as anchors for proteins or contamination, depending on the application [26]. In the electrochemical capacitor, oxygen-containing surface groups have an important influence on the wettability of the carbon material and capacitance by the appearance of an additional redox reaction [11]. However, the hydroxyl groups like the quinon-hydroquinon couple are more desirable in energy storage application due to electrochemical reactions, which increase the specific capacitance of the material.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Persulfate treatment as a method of modifying carbon electrode material for aqueous electrochemical capacitors

Kopczyński

Pęziak-Kowalska

Lota

et al. 2016

J Solid State Electrochem

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The activated carbon was modified by the wet method with a solution of ammonium persulfate at room temperature with different times. Kinetics studies showed that the modification took place mostly during the first 60 min of the process. The physicochemical properties of the obtained carbon were evaluated by thermogravimetric studies, Raman and FTIR spectroscopy, elementary and BET analyses. Furthermore, the fabricated material was applied in symmetric capacitors operated on the three aqueous electrolytes (1 M H 2 SO 4 , 6 M KOH and 1 M Na 2 SO 4 ). Mild conditions of the modification process are optimal to obtain electroactive groups on the carbon surface, which make this material useful in a supercapacitor application. In our studies, we noticed that this type of functional groups mainly appears on the surface of the activated carbon, in the first oxidation stage. With prolonged oxidation, they may transform into undesirable groups. The results show that this kind of modification improves the capacity of all the tested supercapacitors. It was connected mainly with an increase of the carbon material's wettability and in the case of capacitor operated in acid and base electrolytes due to a redox reaction of oxygen functional groups.

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The Capacitance of Graphene: From Model Systems to Large‐Scale Devices

Iamprasertkun

Dryfe

2019

Nanocarbon Electrochemistry

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Oxygen functional groups and electrochemical capacitive behavior of incompletely reduced graphene oxides as a thin-film electrode of supercapacitor

Cited by 598 publications

References 44 publications

Electrostatically Sprayed Reduced Graphene Oxide-Carbon Nanotubes Electrodes for Lithium-Ion Capacitors

Electrostatically Sprayed Reduced Graphene Oxide-Carbon Nanotubes Electrodes for Lithium-Ion Capacitors

Persulfate treatment as a method of modifying carbon electrode material for aqueous electrochemical capacitors

The Capacitance of Graphene: From Model Systems to Large‐Scale Devices

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