A Facile Bulk Production of Processable Partially Reduced Graphene Oxide as Superior Supercapacitor Electrode Material

Saha, Uttam Kumar; Jaiswal, Rimpa; Goswami, Thako Hari

doi:10.1016/j.electacta.2016.02.203

Cited by 35 publications

(51 citation statements)

References 63 publications

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“…The dry form of graphitic oxide was obtained by centrifugation followed by dehydration at 40 o C over phosphorus pentoxide in vacuum. In recent time, several research groups have used Hummers improved method for the synthesis of graphite oxide 10,[63][64][65][66][67][68][69][70][71] . All the well known synthesis methods for graphite oxidation using chemical routes have been summarized in Fig.…”

Section: Hummers Method: Concentrated H 2 So 4 Acid In the Presence Omentioning

confidence: 99%

Graphene oxide: strategies for synthesis, reduction and frontier applications

2016

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Till now, several innovative methods have been developed for the synthesis of graphene materials including mechanical exfoliation, epitaxial growth by chemical vapor deposition, chemical reduction of graphite oxide, liquid-phase exfoliation, arc discharge of graphite, in situ electron beam irradiation, epitaxial growth on SiC, thermal fusion, laser reduction of polymers sheets and unzipping of carbon nanotubes etc. Generally large scale graphene nanosheets are reliably synthesized utilising other forms of graphene-based novel materials, including graphene oxide (GO), exfoliated graphite oxide (by thermal and microwave), and reduced graphene oxide. The degree of GO reduction and number of graphene layers are minimized mainly by applying two approaches via chemical or thermal treatments. The promising and excellent properties together with the ease of processibility and chemical functionalization makes graphene based materials specially GO, ideal candidates for incorporation into a variety of advanced functional materials. Chemical functionalization of graphene can be easily achieved, by the introduction of various functional groups. These functional groups help to control and manipulate the graphene surfaces and help to tune the properties of the resulting hybrid materials. Importantly, graphene and its derivatives GO, have been explored in a wide range of applications, such as energy generation/storage, optical devices, electronic and photonic devices, drug delivery, clean energy, and chemical/bio sensors. In this review article, we have incorporated general introduction of GO, their synthesis, reduction and some selected frontier applications.

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Section: Hummers Method: Concentrated H 2 So 4 Acid In the Presence Omentioning

confidence: 99%

Graphene oxide: strategies for synthesis, reduction and frontier applications

2016

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“…An important request of energy storage devices is low or negligible internal resistance as energy to produce unwanted heat during charge/discharge processes will be less. [21,22] This also demonstrates good reversibility as well as durability and stability of the material, promising ability to use in supercapacitors. The specific capacitance variation of rGO material according to the charge/discharge cycles at the current density of 1 A/g is showed in figure 9.…”

Section: Charge/discharge Durabilitymentioning

confidence: 95%

“…One of the most credent methods to evaluate the durability and performance of the electrode materials is galvanostatic charge/discharge under controlled current conditions. [21] The rGO electrode is charged/discharged at a current density of 1 A/g for 1000 cycles. The test results are presented in Figure 8.…”

Section: Charge/discharge Durabilitymentioning

confidence: 99%

“…Especially, in the highto-medium frequency region, the semicirclesdoes not appear in the Nyquist impedance plot, which is due to the high electrical conductivity, and good capacitance of rGO electrode material. [21,24] The impedance increases with the charge/discharge cycles. After 1000 cycles, the electrode material still exhibits the high conductivity or low internal resistance due to removal of some oxygenated functional groups by the electrochemical reduction.…”

Section: Eis Measurementmentioning

confidence: 99%

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Synthesis of reduced graphene oxide for high‐performance supercapacitor

Năm

Khánh

Thơm

et al. 2018

Vietnam Journal of Chemistry

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Reduced graphene oxide (rGO) were prepared by thermal reduction technique from graphene oxide (GO) in N 2 gas atmosphere at 600 o C for 1 h. The results shown that rGO possessed a multiple layer structure and a specific surface area BET of 389.9 m 2 /g. The electrochemical properties of the rGO materials have been investigated for supercapacitors. Electrochemical measurements show that rGO exhibit a specific capacitance of 85.3 F/g at 1 A/g, and still kept 85 % capacitance after 1000 cycles at 1 A/g, indicating rGO could be a promising candidate for highperformance supercapacitor applications.

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“…In contrast, highly reduced GO (rGO) possesses exceptional conductivity but lacks surface functionality and suffers from poor solubility in common organic solvents [32,33]. Partially reduced graphene oxide, however, is known to combine the benefits of GO and rGO [34,35]. In the literature, an optimal balance between chemical adsorption capacity provided by GO and electronic characteristics of rGO has been utilized for gas detection [27,28].…”

Section: Introductionmentioning

confidence: 99%

Tunable Enhancement of a Graphene/Polyaniline/Poly(ethylene oxide) Composite Electrospun Nanofiber Gas Sensor

2017

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Electrospun nanofibers of a polyaniline (PANi)/ (?)-camphor-10-sulfonic acid (HCSA)/poly(ethylene oxide) (PEO) composite doped with different variants of graphene oxide (GO) were fabricated and evaluated as chemiresistor gas sensors operating at room temperature. A new strategy for enhancing PANi/PEO gas sensor performance is demonstrated using GO dopants reduced via thermal (trGO) or chemical (crGO) routes. By varying the chemical reduction duration (6 h, crGO-6 or 24 h, crGO-24), tunable enhancement of sensor response was achieved. Upon exposure to short-chain aliphatic alcohol vapors, the partially reduced crGO-6 dopant exhibited higher response than GO and crGO-24, suggesting that the dopant enhances sensor performance via increased electrical conductivity over neat GO, and enhanced hydrogen bonding capability over the further-reduced crGO-24 variant. Sensor arrays consisting of PANi/PEO doped with trGO, crGO-6 or crGO-24 moieties successfully identified methanol, ethanol, and 1-propanol vapors using principal component analysis (PCA). Graphical abstract

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A Facile Bulk Production of Processable Partially Reduced Graphene Oxide as Superior Supercapacitor Electrode Material

Cited by 35 publications

References 63 publications

Graphene oxide: strategies for synthesis, reduction and frontier applications

Graphene oxide: strategies for synthesis, reduction and frontier applications

Synthesis of reduced graphene oxide for high‐performance supercapacitor

Tunable Enhancement of a Graphene/Polyaniline/Poly(ethylene oxide) Composite Electrospun Nanofiber Gas Sensor

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