3D percolation modeling for predicting the thermal conductivity of graphene-polymer composites

Aryanfar, Asghar; Medlej, Sajed; Tarhini, Ali; Damadi, S. R.; Tehrani, R B Ali; Goddard, William A.

doi:10.1016/j.commatsci.2021.110650

Cited by 16 publications

(9 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reduction of Rh species occurred when the applied E was more negative than 0.03 V RHE , resulting in an increase in the concentration of reduced Rh species and the creation of an electron pathway from the reduced Rh to the FTO conductive substrate. This electron pathway is described as a percolation process. , The reduced Rh species served as catalytic sites for H + adsorption, facilitating electron transfer from the RhNP to produce H 2 molecules. H 2 was rereleased at a potential more negative than 0.0 V RHE .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Understanding the Activation Mechanism of RhCrO_x Cocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes

Higashi,

Seki,

Nandal

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Mixed oxides of Rh−Cr (RhCrO x ), containing Rh 3+ and Cr 3+ cations, are commonly used as cocatalysts for the hydrogen evolution reaction (HER) on particulate photocatalysts. The precise physicochemical mechanisms of the HER at the catalytic sites of these oxides are not well understood. In this study, model cocatalyst electrodes, composed of nanoparticulate RhCrO x , were fabricated to investigate the physicochemical mechanisms of the HER. Electroanalytical and X-ray photoelectron spectroscopic measurements revealed that nanoparticulate RhCrO x produces reduced Rh (Rh 0 ) species by maintaining an electrode potential more negative than 0.03 V versus the reversible hydrogen electrode (V RHE ). This results in significant enhancement of the HER activity. The catalytic activity for the HER stems from the reduced Rh species, and the inclusion of Cr 3+ (CrO x ) aided in the electron transfer process at the solid/ liquid interface, resulting in a higher current density during the HER. To achieve a solar-to-hydrogen efficiency of over 3%, the conduction band minimum of the particulate photocatalyst should be positioned more negatively than −0.10 V RHE . Moreover, the formation of electron trap states at potentials more positive than 0.03 V RHE should be avoided. This study highlights the importance of understanding the catalytic sites on metal oxide cocatalysts. Moreover, it offers a design strategy for enhancing the efficiency of photocatalytic water splitting.

show abstract

Section: Resultsmentioning

confidence: 99%

“…This electron pathway is described as a percolation process. 57,58 The reduced Rh species served as catalytic sites for H + adsorption, facilitating electron transfer from the RhNP to produce H 2 molecules. H 2 was rereleased at a potential more negative than 0.0 V RHE .…”

Section: Electrochemical Properties Of Nanoparticulate Rhomentioning

confidence: 99%

Understanding the Activation Mechanism of RhCrO_x Cocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes

Higashi,

Seki,

Nandal

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The thermal conductivity of a polymer material doped with carbon nanoparticles is determined by several factors [70], the most important among which are (1) the characteristics of the particles used (defect content, the geometry, aspect ratio), (2) the dispersion of carbon nanoparticles within composite, (3) the percent content loading of particles (volume% or weight%), and (4) the interfacial contact between the polymer matrix and the nanocarbon filler. The heat transport in both polymer matrix and nanocarbon particles is provided by phonon propagation.…”

Section: Thermal Conduction Of Polymer Composites Doped With Carbon N...mentioning

confidence: 99%

“…As is seen, both calculated and measured thermal conductivity demonstrate a slightly increasing temperature dependence which is typical for percolation phonon thermal conduction. A careful study of the thermal conductivity of graphene doped polymer-based composites has been performed by the authors of [70] who prepared a set of composite samples based on polymer PVDFHEP. The polymer was doped with 98.5% pure graphene A careful study of the thermal conductivity of graphene doped polymer-based composites has been performed by the authors of [70] who prepared a set of composite samples based on polymer PVDFHEP.…”

Section: Thermal Conduction Of Polymer Composites Doped With Carbon N...mentioning

confidence: 99%

“…A careful study of the thermal conductivity of graphene doped polymer-based composites has been performed by the authors of [70] who prepared a set of composite samples based on polymer PVDFHEP. The polymer was doped with 98.5% pure graphene A careful study of the thermal conductivity of graphene doped polymer-based composites has been performed by the authors of [70] who prepared a set of composite samples based on polymer PVDFHEP. The polymer was doped with 98.5% pure graphene flakes in weight percentages wg varying between 0.1% and 50%.…”

Section: Thermal Conduction Of Polymer Composites Doped With Carbon N...mentioning

confidence: 99%

See 1 more Smart Citation

Phase Change Materials with Enhanced Thermal Conductivity and Heat Propagation in Them

Елецкий¹

2022

Physchem

View full text Add to dashboard Cite

The review contains information o; n the properties of phase-change materials (PCM) and the possibilities of their use as the basis of thermal energy storage. Special attention is given to PCMs with a phase transition temperature ranging between 20 and 80 °C since such materials can be effectively used to reduce temperature variations in residential and industrial rooms. Thus, the application of PCMs in the construction industry enables one to considerably reduce the power consumption and reduce the negative environmental impact of industrial facilities. Thermophysical characteristics of the main types of PCMs are presented. The heat balance for a room with walls made of PCM-added materials is estimated. The calculations demonstrate that such structures can stabilize the temperature in practical applications as a result of the usage of such materials. The construction of a thermal accumulator on the basis of PCM is proposed and analyzed. This facility uses water as a working fluid and paraffin as a PCM. The thermal accumulator has a modular structure so that the number of similar modules is determined by the quantity of energy to be stored. The potential of wide application of PCMs as a basis for thermal energy storage is rather limited due to a very low conductivity (less than 1 W/(m K)) inherent to these materials. This drawback can be overcome by adding carbon nanoparticles whose thermal conductivity is four to five orders of magnitude greater than that of the matrix material. The problem of fabrication of polymer composites with enhanced thermal conductivity due to nanocarbon particles doping is discussed in detail.

show abstract

Correlation between the electrical and thermal conductivity of acrylonitrile butadiene styrene composites with carbonaceous fillers with different dimensionality

Tubio,

Merazzo,

Abad

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

Acrylonitrile butadiene styrene (ABS) polymer has received considerable attention due to its high versatility for applications, including additive manufacturing. However, its electrical and thermal transport properties limit its application potential. One route to enhance electrical and thermal conductivities is the development of ABS‐based composites by using carbonaceous fillers, which have exceptional mechanical properties and remarkable functional properties. Here, we testing the presence of carbonaceous fillers with different dimensionalities on the electrical and thermal conductivity of ABS composites. In particular, one dimensional (1D) carbon nanotubes (CNT), two dimensional (2D) reduced graphene oxide (rGO), and three dimensional (3D) carbon black (CB) have been used to develop ABS‐based composites with different filler contents. A similar trend exist for the electrical and thermal conductivity results, where the highest conductivity values (electrical conductivity 0.0305 S·cm−1 and thermal conductivity 0.56 W·mK−1) being achieved for ABS‐based composites with 2D rGO filler, highlighting the relevance of specific characteristics of the 2D type filler. In addition, electromagnetic interference (EMI) shielding effectiveness (SE) of the ABS‐based composites containing rGO was superior to other 1D and 3D fillers. The stated correlation between electrical and thermal properties and their dependence on carbonaceous filler dimensionality are essential to be taken into account for properly tailoring functional properties of ABS‐based composites.Highlights Carbonaceous fillers are used to tailor several properties of ABS composites Significant differences are established between filler type or content Electrical percolation threshold strongly depends on the dimensionally 2D rGO more effective to improve electrical/thermal conductivities 1D CNT and 2D rGO fillers exhibit best EMI shielding properties

show abstract

3D percolation modeling for predicting the thermal conductivity of graphene-polymer composites

Cited by 16 publications

References 59 publications

Understanding the Activation Mechanism of RhCrO_x Cocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes

Understanding the Activation Mechanism of RhCrO_x Cocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes

Phase Change Materials with Enhanced Thermal Conductivity and Heat Propagation in Them

Correlation between the electrical and thermal conductivity of acrylonitrile butadiene styrene composites with carbonaceous fillers with different dimensionality

Contact Info

Product

Resources

About

3D percolation modeling for predicting the thermal conductivity of graphene-polymer composites

Cited by 16 publications

References 59 publications

Understanding the Activation Mechanism of RhCrOx Cocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes

Understanding the Activation Mechanism of RhCrOx Cocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes

Phase Change Materials with Enhanced Thermal Conductivity and Heat Propagation in Them

Correlation between the electrical and thermal conductivity of acrylonitrile butadiene styrene composites with carbonaceous fillers with different dimensionality

Contact Info

Product

Resources

About

Understanding the Activation Mechanism of RhCrO_x Cocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes

Understanding the Activation Mechanism of RhCrO_x Cocatalysts for Hydrogen Evolution with Nanoparticulate Electrodes