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.

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.

Construction of (Ni, Cu) Se2 //Reduced Graphene Oxide for High Energy Density Asymmetric Supercapacitor

2017 ◽  
Vol 4 (11) ◽  
pp. 3004-3010 ◽  
Author(s):  
Bo Chen ◽  
Yifan Tian ◽  
Zhaoxi Yang ◽  
Yunjun Ruan ◽  
Jianjun Jiang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
Reduced Graphene

Electrochemical performance of an asymmetric supercapacitor based on graphene and cobalt molybdate electrodes

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16319-16327 ◽  
Author(s):  
Ganesh Kumar Veerasubramani ◽  
Karthikeyan Krishnamoorthy ◽  
Sang Jae Kim
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Negative Electrode ◽  
Positive Electrode ◽  
Asymmetric Supercapacitor ◽  
Asymmetric Supercapacitors ◽  
Reduced Graphene ◽  
Cobalt Molybdate

In this article, we report the fabrication and electrochemical performance of asymmetric supercapacitors (ASCs) based on a reduced graphene oxide (rGO) negative electrode and a cobalt molybdate (CoMoO4) positive electrode.

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.

Two-dimensional heterostructures of V2O5 and reduced graphene oxide as electrodes for high energy density asymmetric supercapacitors

2014 ◽  
Vol 2 (40) ◽  
pp. 17146-17152 ◽  
Author(s):  
D. H. Nagaraju ◽  
Qingxiao Wang ◽  
P. Beaujuge ◽  
H. N. Alshareef
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
High Energy ◽  
High Conductivity ◽  
High Energy Density ◽  
Asymmetric Supercapacitor ◽  
Two Dimensional ◽  
Asymmetric Supercapacitors ◽  
Reduced Graphene

The 2D layered heterostructures of V2O5 nanosheets and reduced graphene oxide show high conductivity and superior asymmetric supercapacitor properties.

A polypyrrole-adorned, self-supported, pseudocapacitive zinc vanadium oxide nanoflower and nitrogen-doped reduced graphene oxide-based asymmetric supercapacitor device for power density applications

2020 ◽  
Vol 44 (3) ◽  
pp. 1063-1075 ◽  
Author(s):  
Lopamudra Halder ◽  
Amit Kumar Das ◽  
Anirban Maitra ◽  
Aswini Bera ◽  
Sarbaranjan Paria ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Vanadium Oxide ◽  
Reduced Graphene Oxide ◽  
Power Density ◽  
Electrode Material ◽  
Asymmetric Supercapacitor ◽  
Supercapacitor Electrode ◽  
Nitrogen Doped ◽  
Reduced Graphene ◽  
Battery Material

Herein, a distinctive approach has been implemented for exploiting a typical battery material zinc vanadium oxide (ZV) as a supercapacitor electrode material.

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.

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