Charge storage and operando electrochemical dilatometry of MXene electrodes in ionic liquids

Masoud Foroutan Koudahi; Andres Camilo Parejo Tovar; François Béguin; Elżbieta Frąckowiak

doi:10.1016/j.ensm.2024.103771

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Title

Charge storage and operando electrochemical dilatometry of MXene electrodes in ionic liquids

Authors

Masoud Foroutan Koudahi (WTCH) ^{[ 1 ][ 7.6 ][ SzD ]}
Andres Camilo Parejo Tovar (WTCH) ^{[ 1 ][ 7.6 ][ SzD ]}
François Béguin (WTCH) ^{[ 1 ][ 7.6 ][ P ]}
Elżbieta Frąckowiak (WTCH) ^{[ 1 ][ 7.6 ][ P ]}

^{[ 1 ]} Instytut Chemii i Elektrochemii Technicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | ^{[ SzD ]} doctoral school student | ^{[ P ]} employee

Scientific discipline (Law 2.0)

[7.6] Chemical sciences

Year of publication

2024

Published in

Energy Storage Materials

Journal year: 2024 | Journal volume: vol. 72

Article type

scientific article

Publication language

english

Keywords

EN

Molybdenum titanium carbide
Titanium carbide
Ionic Liquids
Electrochemical dilatometry expansion
Electrochemical capacitors

Abstract

EN This study offers detailed information regarding the charge storage and structural behavior of the titanium (Ti3C2Tx) and molybdenum/titanium (Mo2Ti2C3Tx) MXenes in three ionic liquids (ILs) with different cations, i.e., [EMIm][TFSI], [BMP][TFSI] and [C3mpyr][TFSI]. The MXene preparation method, based on the MAX phase delamination by HCl/LiF or HF, affected the physicochemical properties and electrochemical response of electrodes. It was found that the interlayer spacing, as well as chemical properties affected by functionality, play an important role on determining the energy storage mechanism of MXenes. Titanium carbide (Ti3C2Tx) was characterized with an extremely delaminated structure and a high amount of surface functional groups, demonstrating hybrid charge storage of both capacitive and faradaic response. On the other hand, the Mo/Ti-based MXene showed a more compact structure with a lower surface accessibility and limited amount of surface functional groups. Therefore, a smaller rate of ionic insertion/deinsertion was observed. Interestingly, operando dilatometry measurements supplied crucial data on volumetric expansion of MXene electrodes under negative and positive polarization with cyclic voltammetry and chronoamperometry. A volumetric expansion (from 0.2% to ca. 6% strain) has been proven depending on the MXene preparation method, electrode polarization, potential range, and dimensions of ionic species in ILs.

Date of online publication

05.09.2024

Pages (from - to)

103771-1 - 103771-13

DOI

10.1016/j.ensm.2024.103771

URL

https://doi.org/10.1016/j.ensm.2024.103771

Comments

Article number: 103771

License type

CC BY (attribution alone)