Amorphous vanadium oxides with metallic character for asymmetric supercapacitors

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F21%3A63527459" target="_blank" >RIV/70883521:28610/21:63527459 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S1385894720325080" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1385894720325080</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cej.2020.126380" target="_blank" >10.1016/j.cej.2020.126380</a>

Result language
angličtina
Original language name
Amorphous vanadium oxides with metallic character for asymmetric supercapacitors
Original language description
Exploiting high-capacitance and broad-potential anode materials is of critical for boosting the energy density of aqueous asymmetric supercapacitors. Herein, we have reported the synthesis of the amorphous vanadium oxide nanosheet arrays with metallicity by defect engineering, which enables the oxygen vacancy content as high as 28.5%. The DOS calculations and the XPS analysis further disclose the disappearance of band gap. The oxygen vacancy can also accelerate the ions migration on their (sub-) surface with lower energy barrier. Consequently, the as-obtained anode delivers an ultrahigh specific capacitance of 554 mF·cm−2 (346 F·g−1) at 1 mA·cm−2 (0.625 A·g−1) with a capacitance retention of 66% even at 32 mA·cm−2. After assembling into a flexible quasi-solid-state asymmetric supercapacitor, the energy density can reach as high as 161.8 μWh·cm−2 at 0.5 mW·cm−2. This finding has extended the defect engineering strategy to regulate the crystal structure and electrical conductivity for high-performance electrochemical devices.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20402 - Chemical process engineering

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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