Electrochemical oxidation of carbon fibres in aqueous solutions and analysis of the surface oxides

Jannakoudakis, A.D.; Jannakoudakis, P. D.; Θεοδωρίδου, Ε.; Besenhard, Jürgen

doi:10.1007/bf01008872

Cited by 82 publications

(31 citation statements)

References 17 publications

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“…Consequently, it appears that most oxidized carbon electrodes have carboxyl (O-C=O), carbonyl (C=O), and phenol (C-OH) functionalities [20,[25][26][27].…”

Section: Resultsmentioning

confidence: 99%

Surface Modifications of a Carbon Anode Catalyst by Control of Functional Groups for Vitamin C Fuel Cells

Kim

Lee

et al. 2011

Electrocatal

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We report that electro-oxidation treatment of carbon paper generates specific functional groups, and controllable coating of metal oxide films on carbon surface alters capacitive behaviors. Electrochemical characteristics, I-V curves in fuel cells, and a structural analysis of XPS represent that the carboxyl group is the most effective functional group in an electro-oxidation of L-ascorbic acid. The appropriate film thickness of titania on electro-oxidized carbon electrode further increases fuel cell performance and electrostatic capacitance by facilitating electron transfer reaction. An excessive amount of titania on carbon reduces contribution of carboxyl groups to electro-oxidation of L-ascorbic acid resulting in decline of catalytic effects since they prohibit L-ascorbic acid molecules from access to the adsorption sites on the carbon surface.

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“…Consequently, it appears that most oxidized carbon electrodes have carboxyl (O-C=O), carbonyl (C=O), and phenol (C-OH) functionalities [20,[25][26][27].…”

Section: Resultsmentioning

confidence: 99%

Surface Modifications of a Carbon Anode Catalyst by Control of Functional Groups for Vitamin C Fuel Cells

Kim

Lee

et al. 2011

Electrocatal

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“…The amount of the adsorbed 2N1N was accurately evaluated from the charge under peak b more preferably than under peak a, since the reduction of 2N1N to the corresponding amine (peak a ) is followed by the reduction of the surface functional groups (13,14). The estimated values were used in Fig.…”

Section: Results and Discussion ( A ) Adsorption Of Nitro Compoundsmentioning

confidence: 99%

“…The application of repetitive anodic oxidation and cathodic reduction by potentiostatic double pulses favours the generation of numerous -OH and X O O H groups on the carbon fibre surface without affecting the mechanical properties and electronic conductivity of the graphitic material (12)(13)(14).…”

Section: Introductionmentioning

confidence: 99%

Electrochemically oxidized carbon fibres as an adsorbent for the attachment of dissolved substances. Adsorption of nitro compounds and ion-exchange of heavy metals

Θεοδωρίδου¹,

Jannakoudakis²,

Jannakoudakis³

et al. 1991

Can. J. Chem.

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, and S. ANTONIADOU. Can. J. Chem. 69, 1881 (1991).The adsorption of several aromatic nitro compounds and the ion-exchange of heavy metal ions on electro-oxidized carbon fibres have been investigated using cyclic voltammetric and polarographic techniques. Electro-oxidation is performed by potentiostatic double pulse application. This procedure results in the generation of many functional --OH and 4 O O H groups with adsorptive and ion-exchanging properties.Multimolecular layers of adsorbed substances may be formed through a procedure of successive adsorption of the nitrocompound and electro-reduction to the corresponding amine, resulting in the attachment of considerable amounts of the nitro-compound to the carbon fibres.The ion-exchange capacity is estimated to be ca. 1 mequiv. g-I and with slight deviations it follows the rank Ag, Cu, Cd, Pb, Hg. After the electro-reduction of the exchanged metal ions, the ion-exchange process can be repeated several times. This procedure is of importance for the removal of significant amounts of heavy and toxic metals from industrial waste waters.

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“…The platinum anode and cathode (platinum) were placed inside and in the bottom side of the column, respectively. The electrochemical oxidation was carried out at currents of 1 mA.m 2 according to literature (Jannakoudakis et al, 1989;Alexander and Jones, 1994) at different oxidation times of 1, 3, and 5 h. Several experiments were performed under the same conditions, using fresh electrolyte each time. The current applied throughout the experiments was high in order to introduce as much surface functional groups as possible in the minimum period of time.…”

Section: Production Of Activated Carbonmentioning

confidence: 99%

Study of Cherry Stones as a Precursor in the Preparation of Low Cost Carbonaceous Adsorbent

Beker¹,

Dertli²,

Duranoglu-Gulbayir³

et al. 2010

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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A cherry stone-based activated carbon was electrochemically and chemically oxidized to enhance its adsorbent property for comparison with as-produced. The samples obtained were characterized by Boehm's titration, pH titration, zeta potential measurement, FT-IR, Brunauer-Emmet-Teller surface area, and pore size distribution. A significant increase in the concentration of surface functional groups was obtained from the oxidation of the samples due to the introduction of oxygencontaining functional groups, as confirmed by Boehm's titration, FT-IR, PZC, and IEP analyses. Activation methods significantly improved the amount of oxygen-containing surface functional groups that make the carbonaceous adsorbents more hydrophilic and acidic, decreasing the pH of their point of zero charge, and increasing their surface charge density. The activated carbon samples obtained were predominantly microporous, and their pore volumes decreased as a function of activation period and temperature. The surface chemistry development of carbons was correlated to increasing removal ability of heavy metals.

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Electrochemical oxidation of carbon fibres in aqueous solutions and analysis of the surface oxides

Cited by 82 publications

References 17 publications

Surface Modifications of a Carbon Anode Catalyst by Control of Functional Groups for Vitamin C Fuel Cells

Surface Modifications of a Carbon Anode Catalyst by Control of Functional Groups for Vitamin C Fuel Cells

Electrochemically oxidized carbon fibres as an adsorbent for the attachment of dissolved substances. Adsorption of nitro compounds and ion-exchange of heavy metals

Study of Cherry Stones as a Precursor in the Preparation of Low Cost Carbonaceous Adsorbent

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