Influence of Ultrasonic Treatment of Activated Carbon in Cavitation and Precavitation Regimes on Capacitive and Pseudocapacitive Energy Storage in Electrochemical Supercapacitors
Influence of ultrasonic treatment of activated carbon on the electric double layer in interface between the carbon and the 7.6 m KOН, 4 m KI, and 2 m ZnI2 aqueous electrolyte solutions as well as on the working parameters of supercapacitors on their base is studied by means of precision porometry...
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| Datum: | 2013 |
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| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Інститут металофізики ім. Г.В. Курдюмова НАН України
2013
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| Schriftenreihe: | Наносистеми, наноматеріали, нанотехнології |
| Online Zugang: | https://nasplib.isofts.kiev.ua/handle/123456789/75915 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Influence of Ultrasonic Treatment of Activated Carbon in Cavitation and Precavitation Regimes on Capacitive and Pseudocapacitive Energy Storage in Electrochemical Supercapacitors / B.Ya. Venhryn, I.I. Grygorchak, B.P. Bakhmatyuk, Yu.O. Kulyk, S.I. Mudry // Наносистеми, наноматеріали, нанотехнології: Зб. наук. пр. — К.: РВВ ІМФ, 2013. — Т. 11, № 3. — С. 605-617. — Бібліогр.: 25 назв. — анг. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | Influence of ultrasonic treatment of activated carbon on the electric double
layer in interface between the carbon and the 7.6 m KOН, 4 m KI, and 2 m
ZnI2 aqueous electrolyte solutions as well as on the working parameters of
supercapacitors on their base is studied by means of precision porometry,
small angle X-ray scattering, cyclic voltamperometry, electrochemical impedance
spectroscopy, and computer simulation methods. As shown, the ultrasonic
treatment at precavitation regimes causes the significant (more
than by 200 times) increase of density of states at the Fermi level that is the
reason not only quantitative but also qualitative changes in farad–volt dependences.
At the same time, an acoustic cavitation field unblocks the Helmholtz
capacitance due to large decrease of volume-charge-region resistance.
Using these data, we propose the new electrochemical system of functionalhybrid
supercapacitor with specific capacitance 1100 F/g and specific energy
49 W·h/kg. |
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