Electrical conductivity of conductive carbon blacks: influence of surface chemistry and topology

Pantea, Dana; Darmstadt, Hans; Kaliaguine, Serge; Roy, Christian

doi:10.1016/s0169-4332(03)00550-6

Cited by 414 publications

(309 citation statements)

References 35 publications

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“…Increasing pressure, however, decreases the contact resistance and reveals their bulk properties. The trend and absolute value for Vulcan agree well with published data [24]. Unlike PtO 2 , which is an insulator, Co-Pt bronze shows a high electrical conductivity comparable with Vulcan XC-72 and IrO 2 .…”

Section: Introductionsupporting

confidence: 88%

“…XPS (X-ray photoelectron spectroscopy) was conducted with ULVAC PHI Quantera SXM (Kanagawa, Japan). Electric conductivities of powder samples were measured with a compression cell shown in Figure 18 that allows to apply a controlled pressure to the powder samples [24]. Brunauer-Emmett-Teller (BET) surface area was determined by Quantachrome Autosorb-1 (Boynton Beach, FL, USA).…”

Section: Characterizationmentioning

confidence: 99%

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Assessing the Potential of Co-Pt Bronze for Electrocatalysis in Acidic Media

2018

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An electron-conducting mixed oxide, Co-Pt bronze was synthesized and examined as a candidate for a highly durable electrocatalyst for both the polymer electrolyte fuel cells and electrolyzers. The motivation of this study comes from the fact that this material has not been studied as an electrocatalyst in acidic media, although past studies showed a high electronic conductivity and a high corrosion resistance. Co-Pt bronze without metallic Pt was obtained by solid-state synthesis and hot aqua regia rinsing. The OER activity was found to be among the highest as a material without Ir and Ru in acidic media, and it showed extremely high electrochemical stability in the OER potential range. Its oxygen reduction reaction (ORR) was obtained after potential cycles down to the hydrogen region, which formed a thin Pt metallic layer over the oxide. While its specific activity was not more than that of pure platinum nanoparticles, its durability against the potential cycles was much higher.

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Section: Introductionsupporting

confidence: 88%

Section: Characterizationmentioning

confidence: 99%

Assessing the Potential of Co-Pt Bronze for Electrocatalysis in Acidic Media

2018

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“…Regarding future work, it would be interesting to investigate the effect of surface properties of carbon nanofillers on the synergistic effect observed, since the surface properties of CB is reported to be closely related with its electrical percolating behavior in CPCs [38]. This might give explanation for the difference between current study and the ones report in literature, where such a synergistic effect was not observed in similar systems [26,29].…”

Section: Discussionmentioning

confidence: 67%

Synergistic effect in conductive networks constructed with carbon nanofillers in different dimensions

Zhang¹,

Li²,

Deng³

et al. 2012

Express Polym. Lett.

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Abstract. Herein, investigation on synergistic effect during network formation for conductive network constructed with carbon nanofillers in different dimensions is conducted. Multi-walled carbon nanotubes (MWNTs) and carbon black (CB) are employed as conductive fillers in this system. Morphological control of the conductive network is realized by adjusting the ratio between different fillers. Classical percolation threshold theory and adjusted excluded volume theory are used to analyze the electrical percolating behavior of these systems. It is observed that the percolation threshold of hybrid fillers filled conductive polymer composites (CPCs) is much lower than that of MWNTs or CB filled CPCs, and it can be reduced from 2.4 to 0.21 wt% by replacing half of the MWNTs with CB. Possible mechanism of this phenomenon is discussed together with morphological observation. A model is proposed to understand the mechanism of the percolation behavior in the composites containing various proportions of nanofillers. Our work is important for the design and preparation of low cost conductive polymer composites with novel electrical property. Vol.6, No.2 (2012) 159-168 Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2012.17 * Corresponding author, e-mail: huadeng@scu.edu.cn © BME-PT PE/MWNTs composites prepared by melt blending. The value is often between 1 to 5 wt% for melt compounded systems and considered as statistical percolation threshold [22]. The mechanism behind this significant difference between kinetic and statistical percolation is the prohibition of re-aggregation between CNTs during melt compounding process [22,24]. It was reported that the re-aggregation process of CNTs within polymer melt can take hours to complete [25]. To achieve better conductivity or lower cost, more than one kind of filler, particularly fillers in different aspect ratios, are used to prepare CPCs. Regarding the formation of conductive network with fillers in different aspect ratios, theoretical study has shown that it is not necessary to build conductive network with high aspect ratio filler alone [26], and the percolation threshold is sensitive to the portion of high aspect ratio filler in a system containing fillers in different aspect ratios [27]. There are a number of investigations reported in the literature on mixed carbon fillers filled CPCs [26,[28][29][30][31]. However, the percolation thresholds of these systems filled with mixed fillers are only simple average of that for systems filled with a particular kind of carbon filler. Therefore, more study is needed to study the true synergistic effect between conductive fillers of different dimensionality in building conductive network. In current study, CPCs based on mixed filler between carbon nanofillers in different dimensions and polypropylene will be fabricated. It is well known that polyolefin is a widely used material and its processability is prominent. Moreover, due to the difference in filler dimension and intrinsic structure, the networ...

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“…Graphite is a layered planar structure, typically tens of microns in length, and is conductive primarily along its planes. Carbon black on the other hand is a sub-micron scale high surface area particle with a roughly spherical shape [8]. Within a polymeric bonder, the complimentary interaction between these two types of carbon gives rise to a conductive matrix which is substantially more conductive than if these materials are used in isolation.…”

Section: Introductionmentioning

confidence: 99%

The effect of graphite and carbon black ratios on conductive ink performance

et al. 2017

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Conductive inks based on graphite and carbon black are used in a host of applications including energy storage, energy harvesting, electrochemical sensors and printed heaters. This requires accurate control of electrical properties tailored to the application; ink formulation is a fundamental element of this. Data on how formulation relates to properties have tended to apply to only single types of conductor at any time, with data on mixed types of carbon only empirical thus far. Therefore, screen printable carbon inks with differing graphite, carbon black and vinyl polymer content were formulated and printed to establish the effect on rheology, deposition and conductivity. The study found that at a higher total carbon loading ink of 29.4% by mass, optimal conductivity (0.029 X cm) was achieved at a graphite to carbon black ratio of 2.6 to 1. For a lower total carbon loading (21.7 mass %), this ratio was reduced to 1.8 to 1. Formulation affected viscosity and hence ink transfer and also surface roughness due to retention of features from the screen printing mesh and the inherent roughness of the carbon components, as well as the ability of features to be reproduced consistently.

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Electrical conductivity of conductive carbon blacks: influence of surface chemistry and topology

Cited by 414 publications

References 35 publications

Assessing the Potential of Co-Pt Bronze for Electrocatalysis in Acidic Media

Assessing the Potential of Co-Pt Bronze for Electrocatalysis in Acidic Media

Synergistic effect in conductive networks constructed with carbon nanofillers in different dimensions

The effect of graphite and carbon black ratios on conductive ink performance

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