Effects of Polypyrrole/Graphene Oxide Composites with Different Reaction Times on Electrochemical Performance

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Minzhen Feng
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reaction Times ◽  
Second Step ◽  
Hummers Method ◽  
Oxide Composites ◽  
Oxide Composite Material ◽  
Modified Hummers Method

Abstract: Graphene oxide (GO) was prepared using the modified Hummers method and used as a template for polypyrrole. Polypyrrole was polymerized in situ on the surface of GO to finally obtain the polypyrrole/graphene oxide composite material. The effects of different reaction times on the electrochemical performance of polypyrrole/graphene oxide in the second step were studied. It was obtained that the composite material had optimal properties when the reaction time was 24 h.

Preparation of Amino-Graphene Electrode Slice

2014 ◽  
Vol 543-547 ◽  
pp. 3810-3813
Author(s):  
Yu Hong Du ◽  
Li Li Lv ◽  
Bao Liu ◽  
Dong Mei Zhao
Keyword(s):  
High Pressure ◽  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Flake Graphite ◽  
Electrochemical Catalysis ◽  
Hummers Method ◽  
Ag Electrode ◽  
Ft Ir ◽  
Modified Hummers Method

The graphene oxide (GO) was prepared by oxidizing flake graphite via the modified Hummers method, and it was halogenated by thionyl chloride after clearing. Then it became amino-graphene (AG) by the action of ethanediamine in methylbenzene. The as-prepared AG was dried and pulverized, then was crushed into slice-like electrode at high pressure using machine made-oneself. The GO and AG in this experiment was analyzed and characterized by SEM, TEM, XRD AND FT-IR. The cyclic voltammetry (CV) was used to illustrate the electrochemical performance of AG electrode. The results revealed that groups containing oxygen of the GO were obviously reduced and the COOH was replaced by-NH2, and the prepared electrode could be applied to the electrochemical catalysis.

Effective removal of arsenic from an aqueous solution by ferrihydrite/goethite graphene oxide composites using the modified Hummers method

2020 ◽  
Vol 8 (6) ◽  
pp. 104416
Author(s):  
M. Vazquez-Jaime ◽  
J.A. Arcibar-Orozco ◽  
C.E. Damian-Ascencio ◽  
A.L. Saldaña-Robles ◽  
M. Martínez-Rosales ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Hummers Method ◽  
Effective Removal ◽  
Removal Of Arsenic ◽  
Oxide Composites ◽  
Modified Hummers Method

Cobalt-iron spinel/reduced graphene oxide composite material for supercapacitor applications

2021 ◽  
Vol 717 (1) ◽  
pp. 60-71
Author(s):  
M. A. Hodlevska ◽  
R. I. Zapukhlyak ◽  
V. M. Boychuk ◽  
V. O. Kotsyubynsky ◽  
A. I. Kachmar ◽  
...  
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Oxide Composite ◽  
Reduced Graphene ◽  
Cobalt Iron ◽  
Oxide Composite Material ◽  
Supercapacitor Applications

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.

Unusual morphologies of reduced graphene oxide and polyaniline nanofibers-reduced graphene oxide composites for high performance supercapacitor applications

RSC Advances ◽  
2014 ◽  
Vol 4 (43) ◽  
pp. 22551-22560 ◽  
Author(s):  
Rahul S. Diggikar ◽  
Dattatray J. Late ◽  
Bharat B. Kale
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Polyaniline Nanofibers ◽  
Pani Nanofibers ◽  
Reduced Graphene ◽  
Oxide Composites ◽  
Enhanced Electrochemical Performance ◽  
Supercapacitor Applications

The unique morphologies of reduced graphene oxide (RGO) and RGO–PANI nanofibers (NF) composites have been demonstrated. The enhanced electrochemical performance was observed for honeycomb like RGO–PANI NFs composites.

Graphene Oxide as a Substrate for Biosensors: Synthesis and Characterization

2021 ◽  
Vol 324 ◽  
pp. 87-93
Author(s):  
Mohamed Adel ◽  
Abdel Hady A. Abdel-Wahab ◽  
Ahmed Abdel-Mawgood ◽  
Ahmed Osman Egiza
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Acidic Solution ◽  
Cost Effective ◽  
Sem Analysis ◽  
Visible Spectroscopy ◽  
Sem Images ◽  
Hummers Method ◽  
Uv Visible ◽  
Modified Hummers Method

Graphene oxide (GO) is an oxidized nanosheets of graphite with a 2D planar structure. GO could be readily complexed with bio-entities as it possesses many oxygen-containing functionalities on its surface. The preparation process is fast, easy, and cost-effective. It was prepared using modified Hummers’ method in acidic solution as a primary solvent and potassium permanganate as an oxidizing agent. Afterwards, it was successfully characterized by FTIR, UV-visible spectroscopy, as well as XRD and Raman spectroscopy, and finally, SEM analysis. It was observed that the formed GO is mainly composed of carbon and oxygen elements rich in oxygen functional groups. Furthermore, the existence of (001) plane in XRD interprets the complete oxidation of graphite with d-spacing 9 Å. Moreover, Raman spectroscopy displayed the sp3 carbon hybridization, besides, the ID/IG ratio is found to be 0.84, which confirms the disorder between graphene oxide layers. The SEM images also pointed out that graphene oxide sheets were regularly stacked together as flake-like structures. Accordingly, the richness of oxygen-containing functionalities was confirmed. Hence, it is appropriate to be used as a base transducer for biosensing applications.

A novel magnetic calcium silicate/graphene oxide composite material for selective adsorption of acridine orange from aqueous solutions

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 34770-34781 ◽  
Author(s):  
Huan Wang ◽  
Youning Chen ◽  
Yinmao Wei
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Acridine Orange ◽  
Calcium Silicate ◽  
Selective Adsorption ◽  
Adsorption Behavior ◽  
Oxide Composite ◽  
Oxide Composite Material

The adsorption behavior of acridine orange on magnetic calcium silicate/graphene oxide composite material.

The Synthesis and Characterization of the Graphene Oxide Covalent Modified Phenolic Resin Nanocomposites

2011 ◽  
Vol 327 ◽  
pp. 115-119 ◽  
Author(s):  
Duo Wang ◽  
Jie Gao ◽  
Wei Fang Xu ◽  
Feng Bao ◽  
Rui Ma ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Phenolic Resin ◽  
Synthesis And Characterization ◽  
Infrared Spectrometry ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Hummers Method ◽  
Modified Hummers Method ◽  
Thermal Stability Of

Graphene oxide (GO) was made by a modified Hummers method. Graphene oxide modified phenolic resin nanocomposites (GO/PF) were prepared by Steglich esterification, catalyzed by dicyclohexyl carbodiimide and 4-dimethylaminopyridine. The composites were characterized by Fourier transform infrared spectrometry, differential scanning calorimetry, X-ray powder diffraction, and scanning electron microscopy. The result revealed that the graphene oxide was absolutely exfoliated and covalent linked GO/PF composite was obtained. The thermal stability of PF is remarkably improved by modification with GO.

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