Role of conducting carbon in electrodes for electric double layer capacitors

Dangler, Chris; Rane-Fondacaro, Manisha V.; Devarajan, Thamarai Selvi; Higashiya, Seiichiro; Snyder, Jeremy; Haldar, Pradeep

doi:10.1016/j.matlet.2010.09.067

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…Third, the Warburg element, Z W , models the diffusion of ions at high frequency into the active material. , For both electrode materials, the SiO 2 coating results in a smaller Warburg coefficient, which could suggest that the coating provides less diffusion limitations for the ions and/or is decreasing the ionic charge-transfer resistance. , Fourth, the semicircle region that corresponds to the parallel connection of R 1 and Z CPE has several reported meanings in the literature. This connection could be due to the electrical charge transfer in the electrode material (possibly between electrode particles), resistance across the separator due to ion depletion, or passivation layer between the electrode and current collector. − In addition, the constant phase element has been attributed to the capacitance of the geometric surface area of the electrode. Due to its low exponential value, this element is not proportional to the electrochemical capacitance .…”

Section: Resultsmentioning

confidence: 99%

Evaluating the Electrochemical Capacitance of Surface-Charged Nanoparticle Oxide Coatings

Leonard¹,

Suyama

Anderson

2012

Langmuir

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While transition metal oxides have been thoroughly investigated as coatings for electrochemical capacitors due to their pseudocapacitance, little work has been done investigating other oxide coatings. There exists a whole class of nanoporous oxides typically synthesized by sol-gel chemistry techniques that have very high differential capacitance. This high differential capacitance has been attributed to the surface potential of these materials and the close approach of counterions near the surface of these oxides. This study focuses on investigating the electrochemical capacitance of non-transition metal oxide nanoparticle coatings when deposited on supporting electrodes. Here, we show that, by adding coatings of SiO(2), AlOOH, TiO(2), and ZrO(2) nanoparticles to graphite support electrodes, we can increase the electrochemical capacitance. We also show that the measured electrochemical capacitance of these oxide-coated electrodes directly relates to the electrophoretic mobility of these materials with the lowest values in capacitance occurring at or near the respective isoelectric pH (pH(IEP)) of each oxide.

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Section: Resultsmentioning

confidence: 99%

Evaluating the Electrochemical Capacitance of Surface-Charged Nanoparticle Oxide Coatings

Leonard¹,

Suyama

Anderson

2012

Langmuir

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“…Electrical conductivity (i.e. the ability of a material to conduct electric current), is a very important property, especially in materials used for energy storage [1,2], metal-polymer composites manufacture [3], electronic devices, etc. For this reason, it is essential to employ a simple and reliable method to determine the electrical conductivity as a control property of many solid materials after their production.…”

Section: Introductionmentioning

confidence: 99%

An electrical conductivity translator for carbons

et al. 2014

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The variety of methodologies used to determine the electrical conductivity of carbons makes it very difficult to compare samples and establish reference values. In this study, the electrical conductivity of a wide range of carbons was determined using two different methods: fourpoint probe and compression. Although the methodologies and the operating conditions are very different, linear correlations between the values measured by these two methods can be established for some of the materials studied. Only materials with a very high conductivity (graphite and carbon black) could not be correlated.

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“…However, this same characteristic limits the transport of both the electrolyte ions and electrons in the electrode framework. [17][18][19][20] Mesophase pitch, which consists of parallel-stacked lamellar macromolecules and has a dense structure, has drawn attention as a raw material for high-density isotropic graphite. [21][22][23][24] The specific structural features of mesophase pitch also facilitate its activation into porous carbon of extremely high specific surface area.…”

Section: Introductionmentioning

confidence: 99%