Reduced graphene oxide paper based nanocomposite materials for flexible supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 26666-26674 ◽  
Author(s):  
Tanmoy Rath ◽  
Patit Paban Kundu
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Power Density ◽  
Nanocomposite Materials ◽  
Flexible Supercapacitor ◽  
Flexible Supercapacitors ◽  
Reduced Graphene ◽  
Graphene Oxide Paper

A flexible supercapacitor is developed by combining reduced graphene oxide (rGO), cellulose and RTIL. The device exhibited good electrochemical performance with an energy density of 6.28 W h kg−1 at a power density of 1.32 kW kg−1 in a 6 M KOH electrolyte.

A reduced graphene oxide modified metallic cobalt composite with superior electrochemical performance for supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (78) ◽  
pp. 63553-63560 ◽  
Author(s):  
Guijing Liu ◽  
Lei Wang ◽  
Bo Wang ◽  
Tiantian Gao ◽  
Dianlong Wang
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Power Density ◽  
Maximum Energy ◽  
Asymmetric Supercapacitor ◽  
Metallic Cobalt ◽  
Reduced Graphene

The prepared rGO/Co//AC asymmetric supercapacitor displayed good electrochemical performance, and it achieved a maximum energy density of 40.7 W h kg−1 at a power density of 1585.0 W kg−1.

Stacking Cell Model Supercapacitor Asymmetry with Multilayer Reduced Graphene Oxide Films Fabricated Using UV Oven Spraying Technique

2021 ◽  
Vol 1028 ◽  
pp. 127-132
Author(s):  
Norman Syakir ◽  
Diyan Unmu Dzujah ◽  
Rahmat Hidayat ◽  
Fitrilawati
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Single Cell ◽  
Reduced Graphene Oxide ◽  
Power Density ◽  
Cell Model ◽  
Oxide Films ◽  
Capacitance Density ◽  
Reduced Graphene ◽  
Power And Energy

We report the fabrication of multilayer reduced graphene oxide films using UV oven spraying technique for stacking cell model supercapacitor asymmetry. In report, we used nickel and carbon substrates as asymmetric current collectors. Using UV oven spraying technique, graphene oxide was coated and insitu converted on substrate surfaces forming reduced graphene oxide films that act as active materials in supercapacitor asymmetry. The films consist of 70 layers with delay time between consecutive layer prior to irradiation is 4 minutes to ensure the photoreduction take place on each layer. UV light source using Mercury lamp 125 watt at 30 cm above the substrates. The model structures consist of three cells stacked serial in 1M KCl electrolyte system. Device performance was characterized using charge-discharge technique for constant current at 2, 3, 4, 5, and 10 mA. Performance parameters are the capacitance density, power and energy density. Single cell supercapacitor has energy density in range of 0.072 Wh/kg to 0.256 Wh/kg and power density in range of 123.06 W/kg to 644.14 W/kg. Meanwhile for stacked cell supercapacitor has energy density in range of 0.377 Wh/kg to 0.755 Wh/kg, and power density in range of 169.95 W/kg to 849.79 W/kg. According to Ragone Plot, the results have feature as supercapacitor, even as single cell. Stacked cell has feature better than single cell in all parameter of capacitance density, power and energy density, and electrical working potential.

scholarly journals Fabrication and Performance of Self-Supported Flexible Cellulose Nanofibrils/Reduced Graphene Oxide Supercapacitor Electrode Materials

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2793 ◽  
Author(s):  
Wen He ◽  
Bo Wu ◽  
Mengting Lu ◽  
Ze Li ◽  
Han Qiang
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
Retention Rate ◽  
Rapid Development ◽  
Cellulose Nanofibrils ◽  
Flexible Supercapacitors ◽  
Reduced Graphene

With the rapid development of portable and wearable electronic devices, self-supporting flexible supercapacitors have attracted much attention, and higher requirements have been put forward for the electrode of the device, that is, it is necessary to have good mechanical properties while satisfying excellent electrochemical performance. In this work, a facile method was invented to obtain excellent self-supported flexible electrode materials with high mechanical properties and outstanding electrochemical performance by combining cellulose nanofibrils (CNFs) and reduced graphene oxide (RGO). We focused on the effect of the ratio of the addition of CNFs and the formation process of the film on the electrochemical and mechanical properties. The results show that the CNFs/RGO12 (where the ratio of CNFs to GO is 1:2) film displayed outstanding comprehensive properties; its tensile strength and conductivity were up to 83 MPa and 202.94 S/m, respectively, and its CA value was as high as 146 mF cm−2 under the current density of 5 mA cm−2. Furthermore, the initial retention rate of the specific capacitance was about 83.7% when recycled 2000 times; moreover, its capacitance did not change much after perpendicular bending 200 times. Therefore, the films prepared by this study have great potential in the field of flexible supercapacitors.

Reduced graphene oxide anchored Cu(OH)2as a high performance electrochemical supercapacitor

2015 ◽  
Vol 44 (33) ◽  
pp. 14604-14612 ◽  
Author(s):  
Atin Pramanik ◽  
Sandipan Maiti ◽  
Sourindra Mahanty
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
Power Density ◽  
High Performance ◽  
Electrochemical Supercapacitor ◽  
Reduced Graphene ◽  
Symmetric Supercapacitor

A Cu(OH)2@RGO symmetric supercapacitor cell shows an excellent energy density and power density (84.5 Wh kg−1at 550 W kg−1).

Multilayer Reduced Graphene Oxide Deposited on Carbon Sheet as Electrodes for Supercapacitor Device

2021 ◽  
Vol 1028 ◽  
pp. 157-161
Author(s):  
Diyan Unmu Dzujah ◽  
Rahmat Hidayat ◽  
Fitrilawati ◽  
Norman Syakir
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
Power Density ◽  
Large Scale ◽  
High Surface ◽  
Reduced Graphene ◽  
Symmetric Supercapacitor ◽  
Carbon Sheet ◽  
Charge Discharge

Supercapacitor or often referred to as ultracapacitor is well-known for its long-life cycle, rapid charge-discharge cycles, its ability to bridge between battery and conventional capacitor in terms of power density and energy density values [1]. Carbon allotropes like graphene, carbon nanotube, etc. are widely used as electrodes for supercapacitor mainly due to its large porosity and high electrical conductivity. Pure graphene is very difficult to be prepared in large scale, then Reduced Graphene Oxide (rGO) is used as an alternative to graphene with properties similar to graphene. On the previous work [2], it was shown that carbon sheet can act as electrodes for supercapacitor, thus depositing rGO on carbon sheet (C-rGO) as electrode of supercapacitor can be a good choice to increase the capacitance through their high surface area. This research focused on studying the characteristics of symmetric supercapacitor device with C-rGO|C-rGO device configuration in 1M KCl electrolyte system. 0.5 mg/ml GO was deposited on carbon sheet by using UV-Oven Spraying method, creating multilayer rGO with total of 70 layers. The system then measured in Galvanostatic Charge-Discharge with current variations of 1, 2, 3, 4, 5, and 10 mA. Energy storage characteristics of supercapacitor is then to be determined from the obtained measurement results. The measurement showed that the device has energy density of 0.25 Wh/kg to 0.72 Wh/kg and power density of 250 W/kg to 3,000 W/kg. Based on the value of energy density and power density showed that the device made had met requirements as supercapacitor.

All-porous heterostructure of reduced graphene oxide–polypyrrole–nanoporous gold for a planar flexible supercapacitor showing outstanding volumetric capacitance and energy density

2018 ◽  
Vol 6 (45) ◽  
pp. 22858-22869 ◽  
Author(s):  
Taniya Purkait ◽  
Guneet Singh ◽  
Navpreet Kamboj ◽  
Manisha Das ◽  
Ramendra Sundar Dey
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
Nanoporous Gold ◽  
Flexible Supercapacitor ◽  
Reduced Graphene ◽  
Volumetric Capacitance ◽  
Porous Morphology

We propose a new prototype of flexible planar supercapacitor with highly conductive all-porous morphology of all the electroactive layers that shows outstanding volumetric stack capacitance (245.34 F cm−3) and energy density (98.48 mW h cm−3).

Porous reduced graphene oxide paper as a binder-free electrode for high-performance supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 27175-27180 ◽  
Author(s):  
Yu Liu ◽  
Yulong Ying ◽  
Yiyin Mao ◽  
Pan Hu ◽  
Xinsheng Peng
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Power Density ◽  
High Performance ◽  
Specific Capacity ◽  
High Specific Capacity ◽  
Reduced Graphene ◽  
Binder Free ◽  
Graphene Oxide Paper ◽  
Good Cycling Stability

Porous rGO exhibited an excellent high specific capacity of 173.5 F g−1, good cycling stability, and 28.5 W h kg−1 and power density of 4000 W kg−1, far beyond those of pure stacked rGO paper.

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