Simultaneous electro-synthesis of polyaniline graphene nanocomposite in dilute graphene oxide as dopant and aniline by electrochemical method and its high specific capacitance

2019 ◽  
Vol 6 (8) ◽  
pp. 085623 ◽  
Author(s):  
Karim Kakaei ◽  
Milad Hamidi ◽  
Nasrin Kakaei
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
Electrochemical Method ◽  
High Specific Capacitance ◽  
Graphene Nanocomposite

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.

High Specific Capacitance and Energy density of Synthesized Graphene Oxide based Hierarchical Al2S3 Nanorambutan for Supercapacitor Applications

2017 ◽  
Vol 246 ◽  
pp. 1097-1103 ◽  
Author(s):  
Muhammad Faisal Iqbal ◽  
Mahmood-Ul-Hassan ◽  
Muhammad Naeem Ashiq ◽  
Shahid Iqbal ◽  
Nasreen Bibi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Specific Capacitance ◽  
High Specific Capacitance ◽  
Supercapacitor Applications

Nanocomposite Sheets Composed of Polyaniline Nanoparticles and Graphene Oxide as Electrode Materials for High-performance Supercapacitor

2018 ◽  
Vol 21 (2) ◽  
pp. 097-102
Author(s):  
Shuhua Pang ◽  
Weiliang Chen ◽  
Zhewei Yang ◽  
Zheng Liu ◽  
Xin Fan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
High Performance ◽  
Electrode Materials ◽  
Monomer Concentration ◽  
High Specific Capacitance ◽  
Chemical Oxidation ◽  
Aniline Monomer ◽  
Chemical Oxidation Polymerization ◽  
Fast Ion

Composite materials based on the combination of graphene oxide and PANI are expected not only to improve the PANI conductivity, but also relieve graphene oxide aggregation via a synergistic effect. We report an easy synthesis of a polyaniline/graphene oxide (PGO) composite with a relatively high specific capacitance by chemical oxidation polymerization. As the employ of phytic acid and increasing aniline monomer concentration, more and more PANI nanoparticles deposited into the interval between GO layers. PGO3 composite exhibits the largest specific capacitance (349 F·g-1) and PGO4 composite follows (314 F·g-1), whereas PGO has a minimal specific capacitance (206 F·g-1). The enhanced capacitance originates from the high capacitance of more PANI nanoparticles and better configuration as well as higher surface area of PGO3 and PGO4 composites for fast ion transport. The as-prepared PGO3 sheets composite with improved electrochemical performance is a promising electrode material for supercapacitor.

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.

In situ assembly of MnO2 nanowires/graphene oxide nanosheets composite with high specific capacitance

2014 ◽  
Vol 116 ◽  
pp. 111-117 ◽  
Author(s):  
Kai Dai ◽  
Luhua Lu ◽  
Changhao Liang ◽  
Jianming Dai ◽  
Qinzhuang Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
High Specific Capacitance ◽  
Graphene Oxide Nanosheets ◽  
Mno2 Nanowires

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.

A FACILE ONE-STEP HYDROTHERMAL METHOD TO PRODUCE GRAPHENE OXIDE/Fe2O3-NANOTUBES COMPOSITES AND ITS ELECTROCHEMICAL PROPERTIES

NANO ◽  
2012 ◽  
Vol 07 (04) ◽  
pp. 1250032 ◽  
Author(s):  
WEN FU ◽  
CHUNNIAN CHEN
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Hydrothermal Method ◽  
High Specific Capacitance ◽  
Cyclic Voltammogram ◽  
Transmission Electron Microscopy Analysis ◽  
Electron Microscopy Analysis ◽  
One Step ◽  
Charge Discharge

The composites of graphene oxide/ Fe2O3-nanotubes (GO/ Fe2O3-NTs) have been fabricated through a facile one-step hydrothermal method. Fe2O3-NTs crystallines were homogeneously distributed on GO, which have been confirmed by transmission electron microscopy analysis (TEM). The structure, composition and electrochemical properties of GO/ Fe2O3-NTs composites were investigated by means of selective-area electron diffraction (SAED), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Raman spectra, cyclic voltammogram (CV) curves and galvanostatic charge–discharge curves. GO/ Fe2O3-NTs composites exhibit a high specific capacitance of 133.2 Fg-1in 1 M Li2SO4electrolyte. In addition, the GO/ Fe2O3-NTs composites electrode shows good long-term cycle stability (only 9% decrease of the specific capacitance is observed after 1000 charge–discharge cycles).

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.

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