Covalent alteration of Ti3C2Tx MXene layers by selenium decoration for enhanced electrochemical capacitance

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F22%3A43924206" target="_blank" >RIV/60461373:22310/22:43924206 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2352152X22019065" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352152X22019065</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.est.2022.105918" target="_blank" >10.1016/j.est.2022.105918</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Covalent alteration of Ti3C2Tx MXene layers by selenium decoration for enhanced electrochemical capacitance

Popis výsledku v původním jazyce

Covalent surface modification of two-dimensional nanomaterials, such as MXene, is a crucial technique to tune the properties of such nanomaterials. Ti3C2Tx with semi-metallic selenium (Se) atoms has been rationally designed and successfully synthesized by facile solid-state chemistry. The electrochemical capacitance of the synthesized pristine Ti3C2Tx and Se/Ti3C2Tx has been assessed basis on assembled symmetric and asymmetric supercapacitors with 1 M Na2SO4 neutral electrolyte. The Se/Ti3C2Tx supercapacitor exhibited a high specific capacitance of 96 F g-1, which is about 53 % higher than the synthesized Ti3C2Tx. Furthermore, a high areal capacitance (485.97 mF cm-2), very good energy density (30 Wh kg -1) and power density (124.7 W kg -1), as well as cycling stability (-90 % capacitance retention over 3000 cycles) were obtained for the Se/Ti3C2Tx supercapacitor. These enhancements are attributed to the larger specific surface area, the reduction of fluorine content, and charge polarization imposed by the TiSe2 binding sites. The asymmetric integrated supercapacitor also not only delivered a good capacitive performance but also demonstrated very high energy and power densities in comparison with the pristine Ti3C2Tx nanosheets.

Název v anglickém jazyce

Covalent alteration of Ti3C2Tx MXene layers by selenium decoration for enhanced electrochemical capacitance

Popis výsledku anglicky

Covalent surface modification of two-dimensional nanomaterials, such as MXene, is a crucial technique to tune the properties of such nanomaterials. Ti3C2Tx with semi-metallic selenium (Se) atoms has been rationally designed and successfully synthesized by facile solid-state chemistry. The electrochemical capacitance of the synthesized pristine Ti3C2Tx and Se/Ti3C2Tx has been assessed basis on assembled symmetric and asymmetric supercapacitors with 1 M Na2SO4 neutral electrolyte. The Se/Ti3C2Tx supercapacitor exhibited a high specific capacitance of 96 F g-1, which is about 53 % higher than the synthesized Ti3C2Tx. Furthermore, a high areal capacitance (485.97 mF cm-2), very good energy density (30 Wh kg -1) and power density (124.7 W kg -1), as well as cycling stability (-90 % capacitance retention over 3000 cycles) were obtained for the Se/Ti3C2Tx supercapacitor. These enhancements are attributed to the larger specific surface area, the reduction of fluorine content, and charge polarization imposed by the TiSe2 binding sites. The asymmetric integrated supercapacitor also not only delivered a good capacitive performance but also demonstrated very high energy and power densities in comparison with the pristine Ti3C2Tx nanosheets.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

<a href="/cs/project/GC20-16124J" target="_blank" >GC20-16124J: Dvojdimenzionální vrstevnaté dichalkogenidy přechodných kovů / nanostrukturované uhlíkové kompozity pro aplikace na elektrochemické uchovávání energie</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Journal of Energy Storage

ISSN

2352-152X

e-ISSN

2352-1538

Svazek periodika

56

Číslo periodika v rámci svazku

1 December 2022

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

nestrankovano

Kód UT WoS článku

000883362100004

EID výsledku v databázi Scopus

2-s2.0-85141332340