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Thermochemically activated carbon as an electrode material for supercapacitors.

Ostafiychuk BK, Budzulyak IM, Rachiy BI, Vashchynsky VM, Mandzyuk VI, Lisovsky RP, Shyyko LO - Nanoscale Res Lett (2015)

Bottom Line: The results of electrochemical studies of nanoporous carbon as electrode material for electrochemical capacitors (EC) are presented in this work.It is established that there is an optimal ratio of 1:1 between content of KOH and carbon material at chemical activation, while the maximum specific capacity of NCM is 180 F/g.An equivalent electrical circuit, which allows modeling of the impedance spectra in the frequency range of 10(-2) to 10(5) Hz, is proposed, and a physical interpretation of each element of the electrical circuit is presented.

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Affiliation: Vasyl Stefanyk PreCarpathian National University, 57 Shevchenko Str., Ivano-Frankivsk, 76018 Ukraine.

ABSTRACT
The results of electrochemical studies of nanoporous carbon as electrode material for electrochemical capacitors (EC) are presented in this work. Nanoporous carbon material (NCM) was obtained from the raw materials of plant origin by carbonization and subsequent activation in potassium hydroxide. It is established that there is an optimal ratio of 1:1 between content of KOH and carbon material at chemical activation, while the maximum specific capacity of NCM is 180 F/g. An equivalent electrical circuit, which allows modeling of the impedance spectra in the frequency range of 10(-2) to 10(5) Hz, is proposed, and a physical interpretation of each element of the electrical circuit is presented.

No MeSH data available.


Related in: MedlinePlus

Dependence of specific capacity NCM (a) and IR drop (b) EC on discharge current. C31 —□—, C32 — Δ —, C33 —○—, C34 —◊—.
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Fig6: Dependence of specific capacity NCM (a) and IR drop (b) EC on discharge current. C31 —□—, C32 — Δ —, C33 —○—, C34 —◊—.

Mentions: The reduction of the specific capacity of the studied materials with the current density increase (Figure 6a) is due to the fact that not all micropores are involved in the charge/discharge processes of the material surface. The latter fact leads to a gradual increase in the ohmic resistance and, consequently, in the voltage drop of the EC at the discharge (Figure 6b).Figure 6


Thermochemically activated carbon as an electrode material for supercapacitors.

Ostafiychuk BK, Budzulyak IM, Rachiy BI, Vashchynsky VM, Mandzyuk VI, Lisovsky RP, Shyyko LO - Nanoscale Res Lett (2015)

Dependence of specific capacity NCM (a) and IR drop (b) EC on discharge current. C31 —□—, C32 — Δ —, C33 —○—, C34 —◊—.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385132&req=5

Fig6: Dependence of specific capacity NCM (a) and IR drop (b) EC on discharge current. C31 —□—, C32 — Δ —, C33 —○—, C34 —◊—.
Mentions: The reduction of the specific capacity of the studied materials with the current density increase (Figure 6a) is due to the fact that not all micropores are involved in the charge/discharge processes of the material surface. The latter fact leads to a gradual increase in the ohmic resistance and, consequently, in the voltage drop of the EC at the discharge (Figure 6b).Figure 6

Bottom Line: The results of electrochemical studies of nanoporous carbon as electrode material for electrochemical capacitors (EC) are presented in this work.It is established that there is an optimal ratio of 1:1 between content of KOH and carbon material at chemical activation, while the maximum specific capacity of NCM is 180 F/g.An equivalent electrical circuit, which allows modeling of the impedance spectra in the frequency range of 10(-2) to 10(5) Hz, is proposed, and a physical interpretation of each element of the electrical circuit is presented.

View Article: PubMed Central - PubMed

Affiliation: Vasyl Stefanyk PreCarpathian National University, 57 Shevchenko Str., Ivano-Frankivsk, 76018 Ukraine.

ABSTRACT
The results of electrochemical studies of nanoporous carbon as electrode material for electrochemical capacitors (EC) are presented in this work. Nanoporous carbon material (NCM) was obtained from the raw materials of plant origin by carbonization and subsequent activation in potassium hydroxide. It is established that there is an optimal ratio of 1:1 between content of KOH and carbon material at chemical activation, while the maximum specific capacity of NCM is 180 F/g. An equivalent electrical circuit, which allows modeling of the impedance spectra in the frequency range of 10(-2) to 10(5) Hz, is proposed, and a physical interpretation of each element of the electrical circuit is presented.

No MeSH data available.


Related in: MedlinePlus