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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.

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.


Discharge curves of the EC based on the carbon material C31. The arrow indicates the direction of growth of the discharge current from 10 to 100 mA in step of 10 mA.
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Fig5: Discharge curves of the EC based on the carbon material C31. The arrow indicates the direction of growth of the discharge current from 10 to 100 mA in step of 10 mA.

Mentions: According to the galvanostatic studies, the sample C31 has the largest capacity (Table 2). The discharge curves show a linear voltage dependence of the discharge current, which is a characteristic of the capacitive behavior of the supercapacitors formed on the studied material (Figure 5).Figure 5


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)

Discharge curves of the EC based on the carbon material C31. The arrow indicates the direction of growth of the discharge current from 10 to 100 mA in step of 10 mA.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig5: Discharge curves of the EC based on the carbon material C31. The arrow indicates the direction of growth of the discharge current from 10 to 100 mA in step of 10 mA.
Mentions: According to the galvanostatic studies, the sample C31 has the largest capacity (Table 2). The discharge curves show a linear voltage dependence of the discharge current, which is a characteristic of the capacitive behavior of the supercapacitors formed on the studied material (Figure 5).Figure 5

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.