Modification of the oxygen-containing functional group on activated carbon fiber in electrodes of an electric double-layer capacitor

Oda, Hirokazu; Yamashita, Akira; Minoura, Shinsaku; Okamoto, Masahiro; Morimoto, Tatsuya

doi:10.1016/j.jpowsour.2005.10.061

Cited by 229 publications

(104 citation statements)

References 26 publications

Supporting

Mentioning

101

Contrasting

Order By: Relevance

“…2, there is a good agreement between the data from two-and three-electrode configurations. This suggests that, in accordance with Oda et al [34], the capacitance of both electrodes does not differ significantly in H 2 SO 4 . As mentioned in Section 2, preliminary results obtained for a few carbons of Table 2, using three-electrode cells, also show a good agreement between the two techniques.…”

Section: The Influence Of Chemical Groups On the Capacitance At Low Csupporting

confidence: 89%

The role of textural characteristics and oxygen-containing surface groups in the supercapacitor performances of activated carbons

Centeno

Stoeckli

2006

Electrochimica Acta

143

116

View full text Add to dashboard Cite

It is suggested that the specific capacitance C 0 of activated carbons at low current densities (d ∼ 1 mA cm −2 ) consists, to a good first approximation, of two contributions. For the H 2 SO 4 electrolyte they correspond to approximately 0.080 F m −2 from the total accessible surface area and an additional pseudo-capacitance of 63 F mmol −1 from the surface species generating CO in thermally programmed desorption (TPD). The new correlation proposed here is an alternative to Shi's earlier approach which considered contributions from the microporous and the external surface areas. Furthermore, it appears that the variation of the specific capacitance C at high current densities d (up to 100-150 mA cm −2 ) depends essentially on the CO 2 -generating surface groups and on 1/L 0 , the inverse of the average micropore width.

show abstract

Section: The Influence Of Chemical Groups On the Capacitance At Low Csupporting

confidence: 89%

The role of textural characteristics and oxygen-containing surface groups in the supercapacitor performances of activated carbons

Centeno

Stoeckli

2006

Electrochimica Acta

143

116

View full text Add to dashboard Cite

show abstract

“…All spectra were then curve-fitted using bands with a Gaussian-Lorentzian line shape and a Shirley baseline, and binding energies were calibrated versus the carbon signal at 284.7 eV using an Mg Kα X-ray source (1253.6 eV). We used the C1s level of saturated hydrocarbons that are not bonded to oxygen at 284.7 eV from internal reference in this paper [20].…”

Section: Electrochemical and Structural Analysismentioning

confidence: 99%

“…The oxidation of ascorbic acid has been studied on various types of electrode materials [16][17][18][19][20][21] including platinum group metals, glassy carbon, and conducting polyaniline. However, the high cost of noble metals and their low performance, as well as that of polyaniline and glassy carbon blocked direct ascorbic acid fuel cells (DAAFCs) from being applied in PEFCs.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…Moreover, the occurrence of functional groups on the surface of the electrode material and their character has high impact on the whole device. It can be found that the oxygen and nitrogen functional groups are the most commonly studied in the context of the electrochemical performance of materials [8,[11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Persulfate treatment as a method of modifying carbon electrode material for aqueous electrochemical capacitors

Kopczyński

Pęziak-Kowalska

Lota

et al. 2016

J Solid State Electrochem

View full text Add to dashboard Cite

The activated carbon was modified by the wet method with a solution of ammonium persulfate at room temperature with different times. Kinetics studies showed that the modification took place mostly during the first 60 min of the process. The physicochemical properties of the obtained carbon were evaluated by thermogravimetric studies, Raman and FTIR spectroscopy, elementary and BET analyses. Furthermore, the fabricated material was applied in symmetric capacitors operated on the three aqueous electrolytes (1 M H 2 SO 4 , 6 M KOH and 1 M Na 2 SO 4 ). Mild conditions of the modification process are optimal to obtain electroactive groups on the carbon surface, which make this material useful in a supercapacitor application. In our studies, we noticed that this type of functional groups mainly appears on the surface of the activated carbon, in the first oxidation stage. With prolonged oxidation, they may transform into undesirable groups. The results show that this kind of modification improves the capacity of all the tested supercapacitors. It was connected mainly with an increase of the carbon material's wettability and in the case of capacitor operated in acid and base electrolytes due to a redox reaction of oxygen functional groups.

show abstract

Modification of the oxygen-containing functional group on activated carbon fiber in electrodes of an electric double-layer capacitor

Cited by 229 publications

References 26 publications

The role of textural characteristics and oxygen-containing surface groups in the supercapacitor performances of activated carbons

The role of textural characteristics and oxygen-containing surface groups in the supercapacitor performances of activated carbons

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

Persulfate treatment as a method of modifying carbon electrode material for aqueous electrochemical capacitors

Contact Info

Product

Resources

About