Approaching the theoretical capacitance of graphene through copper foam integrated three-dimensional graphene networks

2015 ◽  
Vol 3 (12) ◽  
pp. 6324-6329 ◽  
Author(s):  
Ramendra Sundar Dey ◽  
Hans Aage Hjuler ◽  
Qijin Chi
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Cost Effective ◽  
Copper Foam ◽  
Cost Effective Approach ◽  
Reduced Graphene

A facile and cost-effective approach to fabricate all-in-one supercapacitor electrodes is achieved with copper foam integrated three-dimensional reduced graphene oxide networks. The resulting electrodes display high specific capacitance close to the theoretical value of graphene and good charging–discharging stability.

scholarly journals Dissected carbon nanotubes functionalized by 1-hydroxyanthraquinone for high-performance asymmetric supercapacitors

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48341-48353 ◽  
Author(s):  
Xia Yang ◽  
Yuying Yang ◽  
Quancai Zhang ◽  
Xiaotong Wang ◽  
Yufeng An ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Covalent Modification ◽  
Asymmetric Supercapacitors ◽  
Reduced Graphene

1-Hydroxyanthraquinone (HAQ) is selected to functionalize the dissected carbon nanotubes (rDCNTs) with reduced graphene oxide layers through non-covalent modification. The composite achieves high specific capacitance and ultrahigh rate capability.

α-NiS grown on reduced graphene oxide and single-wall carbon nanotubes as electrode materials for high-power supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (35) ◽  
pp. 27940-27945 ◽  
Author(s):  
Ji Yan ◽  
Gregory Lui ◽  
Ricky Tjandra ◽  
Xiaolei Wang ◽  
Lathankan Rasenthiram ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
High Power ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Single Wall Carbon Nanotubes ◽  
Rate Performance ◽  
Reduced Graphene

α-NiS combined with SWNTs and graphene exhibits high specific capacitance, and excellent rate performance and cycling stability.

Thermally reduced graphene oxide/polymelamine formaldehyde nanocomposite as a high specific capacitance electrochemical supercapacitor electrode

2018 ◽  
Vol 6 (14) ◽  
pp. 6045-6053 ◽  
Author(s):  
Ali A. Ensafi ◽  
Hossein A. Alinajafi ◽  
B. Rezaei
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
High Specific Capacitance ◽  
Supercapacitor Electrode ◽  
Electrochemical Supercapacitor ◽  
Reduced Graphene ◽  
Excellent Stability

Thermally rGO/polymelamine formaldehyde nanocomposite shows good behavior as supercapacitor electrode with 2271 F g−1 specific capacitance in 10 A g−1 with excellent stability.

Reduced graphene oxide/nickel cobaltite nanoflake composites for high specific capacitance supercapacitors

2013 ◽  
Vol 111 ◽  
pp. 937-945 ◽  
Author(s):  
Li Wang ◽  
Xiaohong Wang ◽  
Xianping Xiao ◽  
Fugang Xu ◽  
Yujing Sun ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
High Specific Capacitance ◽  
Nickel Cobaltite ◽  
Reduced Graphene

scholarly journals Silver Nanoparticles Embedded on Reduced Graphene Oxide@Copper Oxide Nanocomposite for High Performance Supercapacitor Applications

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5032
Author(s):  
Akhalakur Rahman Ansari ◽  
Sajid Ali Ansari ◽  
Nazish Parveen ◽  
Mohammad Omaish Ansari ◽  
Zurina Osman
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
High Specific Capacitance ◽  
Hydrothermal Route ◽  
X Ray ◽  
Reduced Graphene ◽  
Cuo Nanosheets

In this work, silver (Ag) decorated reduced graphene oxide (rGO) coated with ultrafine CuO nanosheets (Ag-rGO@CuO) was prepared by the combination of a microwave-assisted hydrothermal route and a chemical methodology. The prepared Ag-rGO@CuO was characterized for its morphological features by field emission scanning electron microscopy and transmission electron microscopy while the structural characterization was performed by X-ray diffraction and Raman spectroscopy. Energy-dispersive X-ray analysis was undertaken to confirm the elemental composition. The electrochemical performance of prepared samples was studied by cyclic voltammetry and galvanostatic charge-discharge in a 2M KOH electrolyte solution. The CuO nanosheets provided excellent electrical conductivity and the rGO sheets provided a large surface area with good mesoporosity that increases electron and ion mobility during the redox process. Furthermore, the highly conductive Ag nanoparticles upon the rGO@CuO surface further enhanced electrochemical performance by providing extra channels for charge conduction. The ternary Ag-rGO@CuO nanocomposite shows a very high specific capacitance of 612.5 to 210 Fg−1 compared against rGO@CuO which has a specific capacitance of 375 to 87.5 Fg−1 and the CuO nanosheets with a specific capacitance of 113.75 to 87.5 Fg−1 at current densities 0.5 and 7 Ag−1, respectively.

Performance of Fast Thermally Reduced Graphene Oxide for Supercapacitor

2013 ◽  
Vol 785-786 ◽  
pp. 783-786 ◽  
Author(s):  
Hong Juan Wang ◽  
Dong Zhou ◽  
Feng Peng ◽  
Hao Yu
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
Current Density ◽  
High Specific Capacitance ◽  
Thermal Reduction ◽  
Exfoliated Graphite ◽  
Capacitive Performance ◽  
Reduced Graphene ◽  
A Current

Graphene with different reduction degrees was prepared by fast thermally reduction of exfoliated graphite oxide (GO) at 200-700 °C. Structure and the electrochemical capacitive performance were characterized and measured. The results show that different thermal reduction temperatures can obtain reduced graphene oxide (rGO) with different reduction degrees and influence the electrochemical capacitive performance. The rGO-400 by thermal treat at 400 °C exhibits a significantly high specific capacitance of 407 F g-1 in 6.0 M KOH electrolyte at a current density of 0.4 A g-1 and outstanding cyclic stability with 96.1% of its origin specific capacitance maintained after 2000 cycles at the current density of 10 A g-1 in GCD test.

scholarly journals Template-free synthesis of Se-nanorods-rGO nanocomposite for application in supercapacitors

2019 ◽  
Vol 8 (1) ◽  
pp. 661-670 ◽  
Author(s):  
Zafar Khan Ghouri ◽  
Moaaed Motlak ◽  
Shagufta Afaq ◽  
Nasser A. M. Barakat ◽  
Ahmed Abdala
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
High Specific Capacitance ◽  
Nitrogen Adsorption ◽  
X Ray ◽  
Reduced Graphene ◽  
Template Free

AbstractBoth selenium and reduced graphene oxide have low specific capacitance due to their chemical nature. Nevertheless, their specific capacitance could be enhanced by hybridizing Se nanomaterials with reduced graphene oxide via formation of electrochemical double layer at their interfacial area. Therefore, novel Se-nanorods/rGO nanocomposite was successfully synthesized by template free hot reflux route starting with graphene oxide and selenium dichloride. The composite of rGO decorated by Se-nanorods is characterized using X-ray diffractometry (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption– desorption. The unique architecture of the composite exhibits high specific capacitance of 390 F/ g at 5 mV/s scan rate in 1.0 M KOH solution with ~ 90% cyclic stability after 5000 cycles making it very promising electrode material for supercapacitor applications.

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