Stable graphene–polyoxometalate nanomaterials for application in hybrid supercapacitors

2014 ◽  
Vol 16 (38) ◽  
pp. 20411-20414 ◽  
Author(s):  
Jullieth Suárez-Guevara ◽  
Vanesa Ruiz ◽  
Pedro Gómez-Romero
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
Charge Storage ◽  
Hybrid Supercapacitors ◽  
Reduced Graphene

Stable anchoring of polyoxometalate H3PMo12O40 onto in situ reduced graphene oxide leads to a hybrid electrode with combined capacitive (GO) and faradaic (H3PMo12O40) charge storage mechanisms featuring increased capacitance, energy density and extended cyclability.

High Volumetric Energy Density Hybrid Supercapacitors Based on Reduced Graphene Oxide Scrolls

2017 ◽  
Vol 9 (27) ◽  
pp. 22398-22407 ◽  
Author(s):  
Janardhanan R. Rani ◽  
Ranjith Thangavel ◽  
Se-I Oh ◽  
Jeong Min Woo ◽  
Nayan Chandra Das ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
Hybrid Supercapacitors ◽  
Reduced Graphene

Stabilizing NiCo2O4 hybrid architectures by reduced graphene oxide interlayers for improved cycling stability of hybrid supercapacitors

2018 ◽  
Vol 6 (44) ◽  
pp. 22106-22114 ◽  
Author(s):  
Kyu Hyun Oh ◽  
Girish Sambhaji Gund ◽  
Ho Seok Park
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
Structural Stability ◽  
Nickel Foam ◽  
Cyclic Stability ◽  
Hybrid Architectures ◽  
Hybrid Supercapacitors ◽  
Nickel Cobaltite ◽  
Reduced Graphene

Nickel cobaltite@reduced graphene oxide (NiCo2O4@rGO) hybrid architectures directly deposited on nickel-foam (NF) are synthesized, showing kinetic and structural stability achieved by the rGO interlayers for improved energy density and cyclic stability of the hybrid supercapacitors.

scholarly journals Magnetite ultrafine particles/porous reduced graphene oxide in situ grown onto Ni foam as a binder-free electrode for supercapacitors

RSC Advances ◽  
2020 ◽  
Vol 10 (35) ◽  
pp. 20753-20764
Author(s):  
Yingling Mao ◽  
Benhu Zhou ◽  
Sen Peng
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Ultrafine Particles ◽  
Nickel Foam ◽  
Charge Storage ◽  
Free Charge ◽  
Ni Foam ◽  
Reduced Graphene ◽  
Binder Free

Here, we report a simple and green electrochemical route to deposition of Fe3O4 nanoparticle-porous reduced graphene oxide (p-rGO) nanocomposite onto nickel foam substrate, which is directly used as a binder-free charge storage electrode.

scholarly journals Epitaxial Crystallization of Poly(ε-caprolactone) on Reduced Graphene Oxide at a Low Shear Rate by In Situ SAXS/WAXD Methods

ACS Omega ◽  
2020 ◽  
Vol 5 (49) ◽  
pp. 31535-31542
Author(s):  
Weijun Miao ◽  
Feng Wu ◽  
Shiman Zhou ◽  
Guibin Yao ◽  
Yiguo Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Shear Rate ◽  
Reduced Graphene Oxide ◽  
Epitaxial Crystallization ◽  
Reduced Graphene ◽  
Low Shear

scholarly journals In-situ synthesis of Fe2O3/rGO using different hydrothermal methods as anode materials for lithium-ion batteries

2020 ◽  
Vol 59 (1) ◽  
pp. 477-487 ◽  
Author(s):  
Zhuang Liu ◽  
Haiyang Fu ◽  
Bo Gao ◽  
Yixuan Wang ◽  
Kui Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oleic Acid ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Anode Materials ◽  
Lithium Ion ◽  
In Situ Synthesis ◽  
Cycle Performance ◽  
Reduced Graphene

AbstractThis paper studies in-situ synthesis of Fe2O3/reduced graphene oxide (rGO) anode materials by different hydrothermal process.Scanning Electron Microscopy (SEM) analysis has found that different processes can control the morphology of graphene and Fe2O3. The morphologies of Fe2O3 prepared by the hydrothermal in-situ and oleic acid-assisted hydrothermal in-situ methods are mainly composed of fine spheres, while PVP assists The thermal in-situ law presents porous ellipsoids. Graphene exhibits typical folds and small lumps. X-ray diffraction analysis (XRD) analysis results show that Fe2O3/reduced graphene oxide (rGO) is generated in different ways. Also, the material has good crystallinity, and the crystal form of the iron oxide has not been changed after adding GO. It has been reduced, and a characteristic peak appears around 25°, indicating that a large amount of reduced graphene exists. The results of the electrochemical performance tests have found that the active materials prepared in different processes have different effects on the cycle performance of lithium ion batteries. By comprehensive comparison for these three processes, the electro-chemical performance of the Fe2O3/rGO prepared by the oleic acid-assisted hydrothermal method is best.

Chemically reduced graphene oxide-coated knitted fabric imparted conductivity and outstanding hydrophobicity

2021 ◽  
pp. 004051752199547
Author(s):  
Min Hou ◽  
Xinghua Hong ◽  
Yanjun Tang ◽  
Zimin Jin ◽  
Chengyan Zhu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Chemical Reduction ◽  
Knitted Fabric ◽  
Mesh Structure ◽  
Reduced Graphene ◽  
Chemically Reduced Graphene Oxide ◽  
Modified Hummers Method

Functionalized knitted fabric, as a kind of flexible, wearable, and waterproof material capable of conductivity, sensitivity and outstanding hydrophobicity, is valuable for multi-field applications. Herein, the reduced graphene oxide (RGO)-coated knitted fabric (polyester/spandex blended) is prepared, which involves the use of graphite oxide (GO) by modified Hummers method and in-situ chemical reduction with hydrazine hydrate. The treated fabric exhibits a high electrical conductivity (202.09 S/cm) and an outstanding hydrophobicity (140°). The outstanding hydrophobicity is associated with the morphology of the fabric and fiber with reference to pseudo-infiltration. These properties can withstand repeated bending and washing without serious deterioration, maintaining good electrical conductivity (35.70 S/cm) and contact angle (119.39°) after eight standard washing cycles. The material, which has RGO architecture and continuous loop mesh structure, can find wide use in smart garment applications.

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