Carbons of high surface area. A study by adsorption and high resolution electron microscopy

Marsh, H.; Crawford, D.; O'Grady, T.M.; Wennerberg, A.

doi:10.1016/0008-6223(82)90042-2

Cited by 125 publications

(52 citation statements)

References 9 publications

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“…This structure is due to the presence of aromatic (or graphitic) sheets, reminiscent of the structure of non-porous carbon blacks. Larger micropores, sometimes called supermicropores, have more complicated and cage-like structures [5][6][7]. The pore size distribution (PSD) depends strongly on the preparation of the carbon and it can be assessed by independent techniques: As shown by the present authors [8,9], immersion calorimetry with liquids of molecular dimensions between 0.35 and 1.5 nm provides reliable information for carbons without ÔgateÕ effects [10].…”

Section: Introductionmentioning

confidence: 92%

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On the determination of surface areas in activated carbons

Stoeckli

Centeno

2005

Carbon

112

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The paper examines the validity of two approaches frequently used to determine surface areas in activated carbons, namely the BET method and the use of immersion calorimetry. The study is based on 21 well characterized carbons, whose external and microporous surface areas, S e and S mi , have been determined by a variety of independent techniques. It appears clearly that S BET and the real surface area S mi + S e are in agreement only for carbons with average pore widths L o around 0.8-1.1 nm. Beyond, S BET increases rapidly and S BET À S e is practically the monolayer equivalent of the micropore volume W o . This confirms that a characterization of surface properties based on S BET is, a priori, not reliable. The study of the enthalpy of immersion of the carbons into benzene at 293 K, based on DubininÕs theory, shows that D i H consists of three contributions, namely from the interactions with the micropore walls (À0.136 J m À2 ), the external surface (À0.114 J m À2 ), and from the volume W Ã o of liquid found between the surface layers in the micropores (À141 J cm À3 ). It appears that for carbons where L o > 1 nm, the real surface area cannot be determined in a reliable way from the enthalpy of immersion and a specific heat of wetting alone.

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Section: Introductionmentioning

confidence: 92%

“…A number of studies, for example [1,[4][5][6][7], suggest that micropores are ideally slit-shaped, at least up to widths L and extensions of 1-1.2 nm. This structure is due to the presence of aromatic (or graphitic) sheets, reminiscent of the structure of non-porous carbon blacks.…”

Section: Introductionmentioning

confidence: 99%

On the determination of surface areas in activated carbons

Stoeckli

Centeno

2005

Carbon

112

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“…As a result, the process of methanol oxidation became more active. Qiao et al [13] observed improved electric conductivity followed by the increase of specific surface area of a device that utilized activated carbon produced through KOH activation with needle coke [14][15][16][17].…”

Section: Analysis Of Shape and Electrochemical Quality Of The Catalystmentioning

confidence: 99%

Activating needle coke to develop anode catalyst for direct methanol fuel cell

Park¹,

Im²,

Lee³

et al. 2016

Carbon letters

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Physical and electrochemical qualities were analyzed after KOH activation of a direct methanol fuel cell using needle coke as anode supporter. The results of research on support loaded with platinum-ruthenium suggest that an activated KOH needle coke container has the lowest onset potential and the highest degree of catalyst activity among all commercial catalysts. Through an analysis of the CO stripping voltammetry, we found that KOH activated catalysis showed a 21% higher electrochemical active surface area (ECSA), with a value of 31.37 m 2 /g, than the ECSA of deactivated catalyst (25.82 m 2 /g). The latter figure was 15% higher than the value of one specific commercial catalyst (TEC86E86).

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“…This may be owing to the intercalation of vapor potassium between the carbon layers. [18][19][20] 3.2 Electrochemical properties for EDLC of activated carbon from A. pedunculata shell Figure 3 shows CV curves for the electrodes prepared by using the activated carbon from A. pedunculata shell at the different scan rates from 1 to 50 mV s…”

Section: ¹1mentioning

confidence: 99%

Preparation of Activated Carbon by KOH Activation from <i>Amygdalus Pedunculata</i> Shell and its Application for Electric Double-layer Capacitor

et al. 2015

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Activated carbon was prepared from Amygdalus pedunculata shell by carbonization and KOH activation. A. pedunculata is a good candidate plant for desert greening in China. By choosing the activation conditions, the activated carbon with the microporous structure and the large surface area (2900 m 2 g −1 ) was obtained. The resulting activated carbon exhibited the good electrochemical capacitive behavior. The present activated carbon from A. pedunculata is a promising electrode material for high-performance electric double-layer capacitor.

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Carbons of high surface area. A study by adsorption and high resolution electron microscopy

Cited by 125 publications

References 9 publications

On the determination of surface areas in activated carbons

On the determination of surface areas in activated carbons

Activating needle coke to develop anode catalyst for direct methanol fuel cell

Preparation of Activated Carbon by KOH Activation from <i>Amygdalus Pedunculata</i> Shell and its Application for Electric Double-layer Capacitor

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