Amorphous vanadium oxides with metallic character for asymmetric supercapacitors

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Amorphous vanadium oxides with metallic character for asymmetric supercapacitors

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Amorphous vanadium oxides with metallic character for asymmetric supercapacitors

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemical Engineering Journal

ISSN

1385-8947

e-ISSN

—

Svazek periodika

403

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

—

Kód UT WoS článku

000579752500099

EID výsledku v databázi Scopus

2-s2.0-85088640033