scholarly journals The Importance of Structural Factors for the Electrochemical Performance of Graphene/Carbon Nanotube/Melamine Powders towards the Catalytic Activity of Oxygen Reduction Reaction

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2448
Author(s):  
Piotr Kamedulski ◽  
Jerzy P. Lukaszewicz ◽  
Lukasz Witczak ◽  
Pawel Szroeder ◽  
Przemyslaw Ziolkowski
Keyword(s):  
Catalytic Activity ◽  
Electrochemical Performance ◽  
Electrode Materials ◽  
Reduction Reaction ◽  
Carbon Composites ◽  
Structural Factors ◽  
Governing Factor ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this paper, we show the carbonization of binary composites consisting of graphene nanoplatelets and melamine (GNP/MM), multi-walled carbon nanotubes and melamine (CNT/MM) and trinary composites containing GNP, CNT, and MM. Additionally, the manuscript presents results on the influence of structural factors for the electrochemical performance of carbon composites on their catalytic activity. This study contributes to the wide search and design of novel hybrid carbon composites for electrochemical applications. We demonstrate that intensive nitrogen atom insertion is not the governing factor since hybrid system modifications and porous structure sometimes play a more crucial role in the tailoring of electrochemical properties of the carbon hybrids seen as a noble metal-free alternative to traditional electrode materials. Additionally, HRTEM and Raman spectra study allowed for the evaluation of the quality of the obtained hybrid materials.

scholarly journals Preparation and characterization of PANI/MWCNT/RGO ternary composites as electrode materials for supercapacitors

2021 ◽  
Author(s):  
Huimin Dai ◽  
Li Rong ◽  
Siyu Su ◽  
Yifan Cui ◽  
Yueming Lin ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Reduced Graphene ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Ratio Of Components

Abstract Electrode materials for supercapacitors are being extensively studied at present, the structural and electrochemcial properties of which are still required to be further improved. Hence, a series of polyaniline/reduced graphene oxide binary composites (PANI/RGO, PG-i, i=2, 4, 5) and polyaniline/multi-walled carbon nanotubes/reduced graphene oxide ternary composites (PANI/MWCNT/RGO, PCG-i, i=2, 4, 5) were prepared by a facile hydrothermal method. The morphology, structure and electrochemical performance of these samples are systematically analyzed and discussed. Analysis exhibits that all the samples have abundant pore structure. By changing the ratio of components, PCG-5 shows superior comprehensive electrochemical performance, including a high specific capacitance of 478 F g-1 at 1 A g-1, a considerable capacitance retention (63.56%, from 1 to 20 A g-1, and 55.33%, from 1 to 50 A g-1) and an extraordinary cycling stability (66.28% after 3500 cycles, at 2 A g-1) in 1 M H2SO4. The results prove that the PANI/MWCNT/RGO ternary composite has great potential as supercapacitor electrodes.

Calibration of reaction parameters for the improvement of thermal stability and crystalline quality of multi-walled carbon nanotubes

2010 ◽  
Vol 45 (3) ◽  
pp. 783-792 ◽  
Author(s):  
Saveria Santangelo ◽  
Giacomo Messina ◽  
Giuliana Faggio ◽  
Maurizio Lanza ◽  
Alessandro Pistone ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Crystalline Quality ◽  
Reaction Parameters ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Effect of nanofiller on fibre laser drilling quality of carbon fibre reinforced polymer composite laminates

2018 ◽  
Vol 233 (4) ◽  
pp. 857-870
Author(s):  
Dhiraj Kumar ◽  
Kalyan Kumar Singh
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fibre ◽  
Polymer Matrix ◽  
Composite Laminates ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Multi Walled Carbon Nanotubes ◽  
Fibre Reinforced Polymer ◽  
Walled Carbon Nanotubes

Laser machining of carbon fibre reinforced polymer composites is a challenging task due to a significant difference between physical and thermal properties of the constituent materials, i.e. polymer matrix and carbon fibres. This results in extended heat-affected zone (HAZ), taper kerf and poor surface finishing. This paper focuses on an investigation, attempting to minimise the divergence in the decomposition temperature of carbon fibres and epoxy resin by adding multi-walled carbon nanotubes in polymer matrix as a secondary reinforcement. High thermal conductivity of multi-walled carbon nanotubes increases the thermal diffusivity of polymer matrix, which in turn reduces the matrix recession. In addition, laser power and scan speed was also considered as an input parameter and their influence on output responses such as HAZ, taper angle and surface roughness has been studied. To analyse the effect of multi-walled carbon nanotubes on the resultant thermal damage, an innovative technique, i.e. scanning acoustic microscopy was used. This technique provides a ply-by-ply damage analysis. C-scans of the top and bottom surface of the machined holes in the composite were also carried out. Further, micrographs of the holes were taken to analyse the quality of the holes using field-emission scanning electron microscope. The obtained results indicated that HAZ, taper angle and surface roughness of holes decreased by ∼30%, ∼47% and ∼43%, respectively, with 1.5 wt% multi-walled carbon nanotubes doped carbon fibre reinforced polymer laminates, when compared with the results obtained from experiments with neat carbon fibre reinforced polymer composite laminates.

Multi-Walled Carbon Nanotubes as Electrocatalyst Supports for H2O2 Reduction Reaction

2013 ◽  
Vol 860-863 ◽  
pp. 831-834
Author(s):  
Dan Zheng ◽  
Ting Fang Yang ◽  
Zhang Fei Guo
Keyword(s):  
Cyclic Voltammetry Curve ◽  
Chemical Reduction ◽  
Reduction Reaction ◽  
Carbon Substrate ◽  
Acid Media ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Current Densities ◽  
Reaction Activation Energy ◽  
Walled Carbon Nanotubes

This work studies the use of Multi-walled carbon nanotube (MWCNT) as catalyst supports for H2O2 electro-reduction in acid media. Using impregnation-chemical reduction method, we prepared Pt-Ag/CNTs, Pt-Co/CNTs, Pt-Ag/C and Pt-Co/C nanocatalysts. Four catalysts were analyzed by XRD and TEM. Their electrochemical performance was studied via cyclic voltammetry curve. The results show that: the nanoparticles have a better dispersion on CNTs substrate than on XC-72 carbon substrate. Comparing with Pt-Ag and Pt-Co on XC-72 carbon substrate, the H2O2 reduction reaction activation energy of catalysts on CNTs substrate is bigger, and the peak current densities of catalysts on CNTs substrate are larger than that on XC-72 carbon.

scholarly journals Improving the Performance of Zn-Air Batteries with N-Doped Electroexfoliated Graphene

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2115 ◽  
Author(s):  
Anna Ilnicka ◽  
Malgorzata Skorupska ◽  
Piotr Romanowski ◽  
Piotr Kamedulski ◽  
Jerzy P. Lukaszewicz
Keyword(s):  
Catalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Noble Metals ◽  
Electrode Materials ◽  
Low Cost ◽  
Rapid Development ◽  
Reduction Reaction ◽  
Graphene Sheets ◽  
High Catalytic Activity ◽  
Energy Storage Devices

The constantly growing demand for active, durable, and low-cost electrocatalysts usable in energy storage devices, such as supercapacitors or electrodes in metal-air batteries, has triggered the rapid development of heteroatom-doped carbon materials, which would, among other things, exhibit high catalytic activity in the oxygen reduction reaction (ORR). In this article, a method of synthesizing nitrogen-doped graphene is proposed. Few-layered graphene sheets (FL-graphene) were prepared by electrochemical exfoliation of commercial graphite in a Na2SO4 electrolyte with added calcium carbonate as a separator of newly-exfoliated FL-graphene sheets. Exfoliated FL-graphene was impregnated with a suspension of green algae used as a nitrogen carrier. Impregnated FL-graphene was carbonized at a high temperature under the flow of nitrogen. The N-doped FL-graphene was characterized through instrumental methods: high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Electrochemical performance was determined using cyclic voltamperometry and linear sweep voltamperometry to check catalytic activity in ORR. The N-doped electroexfoliated FL-graphene obeyed the four-electron transfer pathways, leading us to further test these materials as electrode components in rechargeable zinc-air batteries. The obtained results for Zn-air batteries are very important for future development of industry, because the proposed graphene electrode materials do not contain any heavy and noble metals in their composition.

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