Fast-Charging High-Energy Battery–Supercapacitor Hybrid: Anodic Reduced Graphene Oxide–Vanadium(IV) Oxide Sheet-on-Sheet Heterostructure

ACS Nano ◽  
2019 ◽  
Vol 13 (9) ◽  
pp. 10776-10786 ◽  
Author(s):  
Ramkrishna Sahoo ◽  
Tae Hoon Lee ◽  
Duy Tho Pham ◽  
Thi Hoai Thuong Luu ◽  
Young Hee Lee
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Energy ◽  
Reduced Graphene ◽  
Fast Charging ◽  
Oxide Vanadium

Hybrid Supercapacitors Based on Self-Assembled Electrochemical Deposition of Reduced Graphene Oxide/Polypyrrole Composite Electrodes

2021 ◽  
Vol 16 (6) ◽  
pp. 949-956
Author(s):  
Jun Ma ◽  
Junaid Ali Syed ◽  
Dongyun Su
Keyword(s):  
Graphene Oxide ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
Electrochemical Deposition ◽  
High Energy ◽  
Carbon Cloth ◽  
Discharge Process ◽  
Rate Performance ◽  
Reduced Graphene ◽  
Self Assembled

Conductive polymers (CPs) have potential application to commercial energy storage because of their high electrochemical activity and low cost. However, an obstacle in developing CP-based supercapacitors is the degradation in their capacitance during the charge-discharge process that leads to poor rate performance. This study fabricates layers of a high-performance self-assembled polypyrrole/reduced graphene oxide (PPY/RGO) composite material on a carbon cloth through electrochemical deposition. The layered graphene improved the electrochemical properties of PPY. Carbon fiber rods were coated with the PPY/RGO composite layer, the thickness of which depends on the deposition time. Adequate capacitive behaviors were achieved by using 16 layers of polypyrrole/reduced graphene oxide, with a specific capacitance of 490 F g−1 (0.6 A g−1) and good rate performance. The results here provide a novel means of preparing graphene-based nanocomposites films for a variety of functions. A symmetric device was subsequently assembled by using electrodes featuring 16 layers of the polypyrrole/reduced graphene oxide composite. It yielded a specific capacitance of 205 F g−1 and a high energy density of 16.4 Wh kg−1. It also exhibited good cycle stability, with a capacitance retention rate of 85% for 5,000 cycles.

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

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.

Hydrogen storage in a chemical bond stabilized Co9S8–graphene layered structure

Nanoscale ◽  
2015 ◽  
Vol 7 (47) ◽  
pp. 20180-20187 ◽  
Author(s):  
Wei Qin ◽  
Lu Han ◽  
Hai Bi ◽  
Jiahuang Jian ◽  
Xiaohong Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Hydrogen Storage ◽  
Reduced Graphene Oxide ◽  
Layered Structure ◽  
Storage Capacity ◽  
High Energy ◽  
Hydrogen Storage Capacity ◽  
Reduced Graphene ◽  
Milling Method ◽  
Energy Ball

With the high energy ball milling method, a Co9S8-decorated reduced graphene oxide (RGO) composite, which shows excellent hydrogen storage capacity, has been successfully fabricated with a well-organized layered structure.

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