Three-dimensional graphene layers prepared by a gas-foaming method for supercapacitor applications

Hao, Junnan; Liao, Youhao; Zhong, Yayun; Shu, Dong; He, Chun; Guo, Song; Huang, Yulan; Zhong, Jie; Hu, Lingling

doi:10.1016/j.carbon.2015.07.069

Cited by 109 publications

(54 citation statements)

References 58 publications

(54 reference statements)

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“…These sheets can be easily surface modified [4] or functionalized through covalent grafting [5][6]. Once GtO is exfoliated, it can be converted into reduced graphene oxide (rGO) [7] by a variety of methods, such as: a) chemical by employing reducing agents like hydrazine hydrate [8][9][10], NaBH 4 [11][12], urea [13], hydroxylamine [14], pyrrole [15], etc., b) microwaves [16][17][18][19], c) thermal annealing [20][21][22][23][24][25] and d) hydrothermal processing [26][27][28][29][30][31]. rGO has attracted intensive attention mainly because it can be cheaply produced on a large scale from GtO.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrothermal reaction time and alkaline conditions on the electrochemical properties of reduced graphene oxide

Vermisoglou

Giannakopoulou

Romanos

et al. 2015

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Effect of hydrothermal reaction time and alkaline conditions on the electrochemical properties of reduced graphene oxide

Vermisoglou

Giannakopoulou

Romanos

et al. 2015

Applied Surface Science

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“…When the product was heated at 450 °C, NH 4 Cl will decompose and release, which could effectively reduce the thickness of the carbon precursor. [132] …”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

Progress of Nanostructured Electrode Materials for Supercapacitors

Jiang

Yadi

Nie

et al. 2017

Advanced Sustainable Systems

111

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Supercapacitors, as a type of energy storage system, bridge the power/energy gap between conventional capacitors and batteries due to attractive properties such as high power density, long cycle lifespan, and large temperature range. However, the low energy density of supercapacitors compared to lithium‐ion batteries has hindered their general application. In general, the electrochemical performance of supercapacitors is closely related to the structure of their electrode materials, electrolytes, and device design. The main materials used in electrochemical double‐layer capacitors (EDLCs) are carbon materials with various architectures. This is due to their high surface area, good electric conductivity, and intrinsic stability. In this review, recently reported carbon‐based nanostructured electrode materials with 0D, 1D, 2D, and 3D structures are systematically reviewed. The effect of nanostructuring on the properties of supercapacitors including specific capacitance, rate capability, and cycle stability is explored, the details of which may serve as a guide to electrode design for the next generation of EDLCs.

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“…As can be seen, there is no IR drop in discharge curve of q-graphene, whereas PANI and nanohybrid exhibited an IR drop of about 70 and 30 mV at the beginning of discharging steps, respectively. Generally, IR drop at the turning point of CD curves is originated from internal resistance of electrode/active materials and electrolyte potential drop [47]; therefore, the negligible IR drop (30 mV) of nanohybrid can be attributed to the incorporation of highly conductive q-graphene to the PANI matrix and consequently the reduction in nanohybrid internal resistance. The specific capacitance of the electrode materials was calculated using the following equation [48]: where I (A) and t (s) are the discharge current and time, respectively, DV (V) is the potential range, and m (g) is the mass loading of the active materials.…”

Section: Electrochemical Behavior Of the Nanohybridmentioning

confidence: 99%

Synergetic effect of synthesized sulfonated polyaniline/quaternized graphene and its application as a high-performance supercapacitor electrode

et al. 2017

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A new hybrid sulfonated polyaniline/quaternized graphene (s-PANINa/q-graphene) is prepared by electrostatic and p-p interactions between positively charged quaternized graphene (q-graphene) and negatively charged sulfonated polyaniline (s-PANINa). The introduction of the s-PANINa into the q-graphene sheets leads to the formation of nanohybrid with layered morphology and high electrical conductivity. The electrochemical performance of s-PANINa/q-graphene nanohybrid as an electrode material for supercapacitors application is evaluated using cyclic voltammetry and galvanostatic charge/discharge tests in 1.0 M of H 2 SO 4 as an electrolyte. The maximum capacitance of 682 F g -1 is obtained for s-PANINa/qgraphene nanohybrid at the current density of 1.0 A g -1 . 70.0% retention of the initial specific capacitance (from current density of 1.0-30 A g -1 ), which indicates the excellent rate capability and consequently high power characteristics of s-PANINa/q-graphene nanohybrid. Moreover, the proposed nanohybrid shows an excellent stability (less than 5% drop after 2000 cycles) with about 100% of coulombic efficiency. The improved electrochemical performance because of the synergistic effects between q-graphene and the s-PANINa indicates that nanohybrid is a good candidate for high-performance supercapacitors.

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Three-dimensional graphene layers prepared by a gas-foaming method for supercapacitor applications

Cited by 109 publications

References 58 publications

Effect of hydrothermal reaction time and alkaline conditions on the electrochemical properties of reduced graphene oxide

Effect of hydrothermal reaction time and alkaline conditions on the electrochemical properties of reduced graphene oxide

Progress of Nanostructured Electrode Materials for Supercapacitors

Synergetic effect of synthesized sulfonated polyaniline/quaternized graphene and its application as a high-performance supercapacitor electrode

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