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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.


The Nyquist diagrams for capacitor systems based on NCM. C31 —□—, C32 — Δ—, C33 —○—, C34 —◊—.
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Fig8: The Nyquist diagrams for capacitor systems based on NCM. C31 —□—, C32 — Δ—, C33 —○—, C34 —◊—.

Mentions: The structural modeling of a predictable processes based on the experimental data obtained by EIS is a systematic approach in which the object is seen as EEC, which includes elements that characterize the boundary phase of electrode/electrolyte. EEC is a simplified model of real processes in the studied system, which creates resistance to electric current. The main criterion for the choice of the equivalent circuit is a complete physical design of all its structural elements providing the optimal approximation of experimental impedance hodograph − ImZ = f(ReZ) (Figure 8).Figure 8


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)

The Nyquist diagrams for capacitor systems based on NCM. C31 —□—, C32 — Δ—, C33 —○—, C34 —◊—.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig8: The Nyquist diagrams for capacitor systems based on NCM. C31 —□—, C32 — Δ—, C33 —○—, C34 —◊—.
Mentions: The structural modeling of a predictable processes based on the experimental data obtained by EIS is a systematic approach in which the object is seen as EEC, which includes elements that characterize the boundary phase of electrode/electrolyte. EEC is a simplified model of real processes in the studied system, which creates resistance to electric current. The main criterion for the choice of the equivalent circuit is a complete physical design of all its structural elements providing the optimal approximation of experimental impedance hodograph − ImZ = f(ReZ) (Figure 8).Figure 8

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.