A study of the topography of a glassy carbon surface following low-power radio-frequency oxygen plasma treatment

Brown, N. M. D.; Cui, Nai-Yi; McKinley, A

doi:10.1016/s0169-4332(98)00198-6

Cited by 20 publications

(11 citation statements)

References 17 publications

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“…With short treatment times craters with random size distribution are visible. This morphology change could be caused by etching via formation of CO radicals and CO2 molecules, as already observed earlier (Brown et al 1998;Elersic 2011). With increasing exposure time roughening of the fiber surface occurs giving rise most probably to higher catalytic surface area (Fig.…”

Section: Resultssupporting

confidence: 69%

“…According to the literature using oxygen plasma treatment hydroxyl or keto-enol functional groups can be introduced on the surface of pyrolytic graphite [Nakahara & Sanada 1993;Nakahara & Sanada 1994;Cvelbar, et al 2006). Thereby the reported microscopy studies on plasma treated carbon based samples reveal changes in the topographies propagating with increasing treatment durations (Brown, et al 1998;Paredes et al 2000;Elersic et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Improvement of the Performance of Graphite Felt Electrodes for Vanadium-Redox-Flow-Batteries by Plasma Treatment

Hammer¹,

Berger²,

Komsiyska³

2014

Int. J. Renew. Energy Dev.

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In the frame of the present contribution oxidizing plasma pretreatment is used for the improvement of the electrocatalytic activity of graphite felt electrodes for Vanadium-Redox-Flow-Batteries (VRB). The influence of the working gas media on the catalytic activity and the surface morphology is demonstrated. The electrocatalytical properties of the graphite felt electrodes were examined by cyclic voltammetry and electrochemical impedance spectroscopy. The obtained results show that a significant improvement of the redox reaction kinetics can be achieved for all plasma modified samples using different working gasses (Ar, N2 and compressed air) in an oxidizing environment. Nitrogen plasma treatment leads to the highest catalytical activities at the same operational conditions. Through a variation of the nitrogen plasma treatment duration a maximum performance at about 14 min cm-2 was observed, which is also represented by a minimum of 90 Ω in the charge transfer resistance obtained by EIS measurements. The morphology changes of the graphitized surface were followed using SEM.

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Section: Resultssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Improvement of the Performance of Graphite Felt Electrodes for Vanadium-Redox-Flow-Batteries by Plasma Treatment

Hammer¹,

Berger²,

Komsiyska³

2014

Int. J. Renew. Energy Dev.

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“…This is approximately the size of the graphitelike ribbons. 11 Brown et al 12 claim that the plasma etching left only the amorphous part of the GC at the surface. In this sense, the plasma reveals the pores between the graphitic phases.…”

Section: E Topography Of the S0 2 Plasma Treated Polypropylene And Gmentioning

confidence: 99%

Functionalization of graphite, glassy carbon, and polymer surfaces with highly oxidized sulfur species by plasma treatments

Coen¹,

Keller

Groening

2002

Journal of Applied Physics

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S0 2 and S0 2 + H 2 0 plasma treatments have been performed on highly oriented pyrolytic graphite, glassy carbon and several polymers in order to functionalize their surface with sulfur in different oxidation states. X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectroscopy measurements prove that highly oxidized sulfur species (S0 3 , S0 3 H, 80 4 , and S0 4 H) as well as covalently bound sulfur and. low oxidized sulphur species (SO and 80 2) are formed and chemisorbed at the surface by plasma treatment. The oxidation state of the adsorbed sulfur species depends on the bias potential applied to the sample. The greater the bias, the lower the oxidation state. The same behavior as a function of the plasma parameters is found for all substrates. The maximal coverage of the surface with sulfur functionalities has been estimated to be about one monolayer. The modifications of the surface topography have also been measured with atomic force microscopy.

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“…Due to their superior electrical and physical properties, [30][31][32] carbon materials are of interest for developing modified nanostructured surfaces with high specific area, for example, by plasma treatment. [33][34][35] Moreover, carbon is a commonly used material in PEMFC in the form of microfibers of a gas diffusion layer (GDL).…”

Section: Introductionmentioning

confidence: 99%

Growth and composition of nanostructured and nanoporous cerium oxide thin films on a graphite foil

et al. 2015

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The morphology and composition of CeOx films prepared by r.f. magnetron sputtering on a graphite foil have been investigated mainly by using microscopy methods. This study presents the formation of nanocrystalline layers with porous structure due to the modification of a carbon support and the formation of cerium carbide crystallites as a result of the deposition process. Chemical analyses of the layers with different thicknesses performed by energy dispersive X-ray spectroscopy, electron energy loss spectroscopy and X-ray photoelectron spectroscopy have pointed to the reduction of the cerium oxide layers. In the deposited layers, cerium was present in mixed Ce(3+) and Ce(4+) valence. Ce(3+) species were located mainly at the graphite foil-CeOx interface and the chemical state of cerium was gradually changing to Ce(4+) going to the layer surface. It became more stoichiometric in the case of thicker layers except for the surface region, where the presence of Ce(3+) was associated with oxygen vacancies on the surface of cerium oxide grains. The degree of cerium oxide reduction is discussed in the context of particle size.

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A study of the topography of a glassy carbon surface following low-power radio-frequency oxygen plasma treatment

Cited by 20 publications

References 17 publications

Improvement of the Performance of Graphite Felt Electrodes for Vanadium-Redox-Flow-Batteries by Plasma Treatment

Improvement of the Performance of Graphite Felt Electrodes for Vanadium-Redox-Flow-Batteries by Plasma Treatment

Functionalization of graphite, glassy carbon, and polymer surfaces with highly oxidized sulfur species by plasma treatments

Growth and composition of nanostructured and nanoporous cerium oxide thin films on a graphite foil

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