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).

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.

High-strength graphene composite films by molecular level couplings for flexible supercapacitors with high volumetric capacitance

2017 ◽  
Vol 5 (29) ◽  
pp. 15008-15016 ◽  
Author(s):  
Jun Cao ◽  
Chen Chen ◽  
Kena Chen ◽  
Qiongqiong Lu ◽  
Qingrong Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Reduced Graphene Oxide ◽  
Molecular Level ◽  
Composite Films ◽  
High Strength ◽  
Flexible Supercapacitor ◽  
Graphene Composite ◽  
Reduced Graphene ◽  
Volumetric Capacitance

A strategy to prepare freestanding reduced graphene oxide@polyvinyl alcohol composite films was developed. After introducing H2SO4, they can serve as flexible supercapacitor electrodes with high volumetric capacitance.

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

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.

Pseudocapacitance and excellent cyclability of 2,5-dimethoxy-1,4-benzoquinone on graphene

2016 ◽  
Vol 9 (8) ◽  
pp. 2586-2594 ◽  
Author(s):  
Muhammad Boota ◽  
Chi Chen ◽  
Matthieu Bécuwe ◽  
Ling Miao ◽  
Yury Gogotsi
Keyword(s):  
Graphene Oxide ◽  
Hydrothermal Method ◽  
Reduced Graphene Oxide ◽  
Three Dimensional ◽  
Covalent Functionalization ◽  
Redox Active ◽  
Reduced Graphene ◽  
One Step ◽  
Volumetric Capacitance ◽  
Graphene Oxide Sheets

Non-covalent functionalization of 2,5-dimethoxy-1,4-benzoquinone and hydroquinone on reduced graphene oxide sheets led to the formation of a redox-active three-dimensional gel architecture via a one-step hydrothermal method, where the former exhibited high gravimetric and volumetric capacitance and 99% capacitance retention after 25 000 cycles at 50 mV s−1.

Sandwich-like NiCo layered double hydroxide/reduced graphene oxide nanocomposite cathodes for high energy density asymmetric supercapacitors

2019 ◽  
Vol 48 (16) ◽  
pp. 5193-5202 ◽  
Author(s):  
Kai Le ◽  
Zhou Wang ◽  
Fenglong Wang ◽  
Qi Wang ◽  
Qian Shao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
Layered Double Hydroxide ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitors ◽  
Reduced Graphene ◽  
Excellent Cycling Stability ◽  
Double Hydroxide

Lab-synthesized sandwich-like LDH/rGO composites were assembled into asymmetric supercapacitors exhibiting high energy density and excellent cycling stability.

A supercapacitor with ultrahigh volumetric capacitance produced by self-assembly of reduced graphene oxide through phosphoric acid treatment

2020 ◽  
Vol 8 (36) ◽  
pp. 18933-18944 ◽  
Author(s):  
Zhaoyuan Liu ◽  
Lidong Wang ◽  
Guizhi Ma ◽  
Yinan Yuan ◽  
Henan Jia ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Graphene Oxide ◽  
Phosphoric Acid ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Acid Treatment ◽  
Treatment Method ◽  
Reduced Graphene ◽  
Volumetric Capacitance ◽  
Heat Treatment Method

Self-assembled reduced graphene oxide was prepared by a phosphoric acid heat-treatment method and exhibited an ultra-high volumetric capacitance.

A ternary MnO2-deposited RGO/lignin-based porous carbon composite electrode for flexible supercapacitor applications

2019 ◽  
Vol 43 (35) ◽  
pp. 14084-14092 ◽  
Author(s):  
Linlin Cui ◽  
Chen Cheng ◽  
Feng Peng ◽  
Yupeng Yang ◽  
Yue Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
Porous Carbon ◽  
Composite Electrode ◽  
Carbon Composite ◽  
Flexible Supercapacitor ◽  
Reduced Graphene ◽  
Carbon Composite Electrode ◽  
Supercapacitor Applications

MnO2 nanoparticles were successfully synthesized on a reduced graphene oxide/lignin-based porous carbon (RGO/PC) composite film by a simple electrodeposition method, and a ternary RGO/PC/MnO2 composite electrode for flexible supercapacitors was prepared.

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