TY  - JOUR
AU  - Burtsev, Vasilii
AU  - Miliutina, Elena
AU  - Shilenko, Vera
AU  - Kukralova, Karolina
AU  - Chumakov, Andrei
AU  - Schwartzkopf, Matthias
AU  - Svorcik, Vaclav
AU  - Lancok, Jan
AU  - Chertopalov, Sergii
AU  - Lyutakov, Oleksiy
TI  - Covalent surface grafting of Ti<sub>3</sub>C<sub>2</sub>T flakes for enhancement of symmetric supercapacitor performance
JO  - Journal of power sources
VL  - 609
SN  - 0378-7753
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - PUBDB-2024-04919
SP  - 234710
PY  - 2024
AB  - In this work the covalent surface modification of MXene flakes (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) was proposed for the increasing of the performance of subsequently created symmetric supercapacitor. Covalent surface modification was performed with utilization of diazonium salts (hydrophobic or hydrophilic) and plasmon-assisted photochemistry. Applied procedure allows to block the reactive (weak and/or catalytically active) sites on flakes surface and increase the flakes interplanar spacing, both enhancing the functionality of an MXene-based supercapacitor. Especially pronounced positive effect gives the surface modification with hydrophilic chemical moieties. In particular, we observed increase of supercapacitance from 197 to 284 F g<sup>−1</sup> in acidic and from 86 to 142 F g<sup>−1</sup> in alkaline conditions for flakes grafted with –C<sub>6</sub>H<sub>4</sub>–COOH chemical moieties at scan rate 20 mV/s. The flakes grafted with hydrophobic chemical moieties allow to achieve almost constant value of supercapacitance for different speed of charge discharge. In addition, the surface grafting prevents the supercapacitor degradation and decelerates the spontaneous discharge in open circuit mode. These results suggest strategy for further improvement of MXene-based supercapacitors as energy storage device.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001241775700001
DO  - DOI:10.1016/j.jpowsour.2024.234710
UR  - https://bib-pubdb1.desy.de/record/611450
ER  -