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Adjustable electrochemical properties of solid-solution MXenes
Journal article   Open access   Peer reviewed

Adjustable electrochemical properties of solid-solution MXenes

Likui Wang, Meikang Han, Christopher E. Shuck, Xuehang Wang and Yury Gogotsi
Nano energy, v 88, 106308
Oct 2021
DOI: https://doi.org/10.1016/j.nanoen.2021.106308
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.1016/j.nanoen.2021.106308View
Accepted (AM)Open Access (Publisher-Specific),  Open

Abstract

MXene Solid solution Supercapacitor Titanium niobium carbide Vanadium niobium carbide
MXenes are promising pseudocapacitive materials with ultrahigh specific capacitance. Currently, more than 30 stoichiometric MXene compositions and about 20 solid solutions have been experimentally synthesized. However, most studies focus on Ti3C2Tx or a few other single-M MXenes, and little is known about the electrochemical properties of solid-solution MXenes. Herein, two sets of niobium-based solid-solution MXenes (Ti2−yNbyTx and V2−yNbyTx; 0 ≤ y ≤ 2) were synthesized and the dependence of their electrochemical properties on the ratio of M elements in the structure was investigated. Relationships between the chemistry and charge storage ability, including capacitive properties and cycling stability in aqueous protic electrolyte, were determined. There is an inverse relationship between the prominence of the redox peaks and cycling stability; the latter increases with the niobium content. For instance, the capacitance retention after 20,000 cycles is less than 1% for Ti2CTx, but 78% for Ti0.4Nb1.6CTx. This study shows that electrochemical properties of MXenes can be controlled by tuning the ratio of transition metals in the MXene structure. • Double-metal solid-solution MXenes (Ti2−yNbyTx and V2−yNbyTx; 0 < y < 2) were synthesized and investigated. • The capacitive properties and cycling stability of solid-solution MXenes directly depend on their composition. • The redox peak intensity decreases while the cycling stability increases with the Nb content. • This study provides a guide for adjusting the electrochemical properties of MXenes by tuning the M-site chemistry.

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Collaboration types
Domestic collaboration
International collaboration
Web of Science research areas
Chemistry, Physical
Materials Science, Multidisciplinary
Nanoscience & Nanotechnology
Physics, Applied
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