Electrocapacitance of hybrid film based on graphene oxide reduced by ascorbic acid

Prună, A.; Tamvakos, Dimitrios; Sgroi, Mauro Francesco; Pullini, D.; Nieto, Esther Asedegbega; Busquets-Mataix, D.

doi:10.3139/146.111193

Cited by 12 publications

(4 citation statements)

References 41 publications

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“…Graphene is a two-dimensional (2D) nanomaterial composed of a hexagonal honeycomb lattice [ 1 ]. With the distinguished properties in electronics, thermal conductivity, optical transparence and mechanics, graphene has powerful potential in nanosensors, nano-resonators, supercapacitors [ 2 , 3 , 4 ], batteries [ 5 , 6 , 7 ], etc. The covalent bonds between carbon atoms in graphene ensure the stability in mechanical and chemical properties [ 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Random Porosities in Resonant Frequencies of Graphene Based on the Monte Carlo Stochastic Finite Element Model

Chu

Shi

et al. 2021

IJMS

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With the distinguished properties in electronics, thermal conductivity, optical transparence and mechanics, graphene has a powerful potential in nanosensors, nano-resonators, supercapacitors, batteries, etc. The resonant frequency of graphene is an important factor in its application and working environment. However, the random dispersed porosities in graphene evidently change the lattice structure and destroy the integrity and geometrical periodicity. This paper focuses on the effects of random porosities in resonant frequencies of graphene. Monte Carlo simulation is applied to propagate the porosities in the finite element model of pristine graphene. The statistical results and probability density distribution of porous graphene with atomic vacancy defects are computed based on the Monte Carlo finite element model. The results of porous graphene with atomic vacancy defects are compared and discussed with the results of graphene with bond vacancy defects. The enhancement effects of atomic vacancy defects are confirmed in porous graphene. The influences of atomic vacancy defects on displacement and rotation vector sums of porous graphene are more concentrated in local places.

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Section: Introductionmentioning

confidence: 99%

The Effects of Random Porosities in Resonant Frequencies of Graphene Based on the Monte Carlo Stochastic Finite Element Model

Chu

Shi

et al. 2021

IJMS

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“…The CV was performed in the −1.4 and 0 V potential range vs. Ag/AgCl at 50 mV s −1 for 10 cycles [ 15 ]. The obtained electrode was named rGO E .The chemical reduction of GO was performed using L-ascorbic acid in an ascorbic acid:GO w/w ratio of 10:1 at 60 °C for 10 h [ 27 ]. The obtained rGO substrates were rinsed with distilled water and air-dried.…”

Section: Methodsmentioning

confidence: 99%

Graphene Oxide-Polypyrrole Coating for Functional Ceramics

2020

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Ceramic substrates were metallized with a Ni-Mo-P electroless coating and further modified with a polypyrrole (PPy) coating by the electrodeposition method. The properties of the polypyrrole coating were studied with the addition of a graphene oxide (GO) nanomaterial prior to the electrodeposition and its reduction degree. Fourier Transform Infrared Spectroscopy, Field-Emission Scanning Electron Microscopy, Raman spectroscopy and cyclic voltammetry were employed to characterize the properties of the coatings. The results indicated the successful synthesis of conductive electrodes by the proposed approach. The electrodeposition of PPy and its charge storage properties are improved by chemically reduced GO. The surface capacitive contribution to the total stored charge was found to be dominant and increased 2–3 fold with the reduction of GO. The chemically reduced GO-modified PPy exhibits the highest capacitance of 660 F g−1 at 2 mV s−1, and shows a good cyclability of 94% after 500 charge/discharge cycles. The enclosed results indicate the use of an NiMoP electroless coating, and modification with a carbon nanomaterial and conducting polymer is a viable approach for achieving functional ceramics.

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“…The material was obtained by using a modified Hummers' method as described previously. 67 Basically, graphite powder was oxidized in two steps with H 2 SO 4 and KMnO 4 . The chemical conversion of GO into rGO was performed using ascorbic acid as a reducing agent.…”

Section: Synthesis Of Chemically Reduced Graphene Oxide and Preparatimentioning

confidence: 99%

In vitro and environmental toxicity of reduced graphene oxide as an additive in automotive lubricants

et al. 2018

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Despite the ground-breaking potential of nanomaterials, their safe and sustainable incorporation into an array of industrial markets prompts a deep and clear understanding of their potential toxicity for both humans and the environment. Among the many materials with great potential, graphene has shown promise in a variety of applications; however, the impact of graphene based products on living systems remains poorly understood. In this paper, we illustrate that via exploiting the tribological properties of graphene nanosheets, we can successfully improve both the frictional behaviour and the anti-wear capacity of lubricant oil for mechanical transmission. By virtue of reducing friction and enhancing lubricant lifetimes, we can forecast a reduction in friction based energy loss, in addition to a decrease in the carbon footprint of vehicles. The aforementioned positive environmental impact is further strengthened considering the lack of acute toxicity found in our extensive in vitro investigation, in which both eukaryotic and prokaryotic cells were tested. Collectively, our body of work suggests that by the use of safe nanoadditives we could contribute to reducing the environmental impact of transportation and therein take a positive step towards a more sustainable automotive sector. The workflow proposed here for the evaluation of human and environmental toxicity will allow for the study of nanosized bare graphene material and can be broadly applied to the translation of graphene-based nanomaterials into the market.

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Electrocapacitance of hybrid film based on graphene oxide reduced by ascorbic acid

Cited by 12 publications

References 41 publications

The Effects of Random Porosities in Resonant Frequencies of Graphene Based on the Monte Carlo Stochastic Finite Element Model

The Effects of Random Porosities in Resonant Frequencies of Graphene Based on the Monte Carlo Stochastic Finite Element Model

Graphene Oxide-Polypyrrole Coating for Functional Ceramics

In vitro and environmental toxicity of reduced graphene oxide as an additive in automotive lubricants

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