Titanium Carbide MXene Shows an Electrochemical Anomaly in Water-in-Salt Electrolytes
Wang X. Mathis T.S. Sun Y. Tsai W.-Y. Shpigel N. Shao H. Zhang D. Hantanasirisakul K. Malchik F. Balke N. Jiang D.-E. Simon P. Gogotsi Y.
28 September 2021American Chemical Society
ACS Nano
2021#15Issue 915274 - 15284 pp.
Identifying and understanding charge storage mechanisms is important for advancing energy storage. Well-separated peaks in cyclic voltammograms (CVs) are considered key indicators of diffusion-controlled electrochemical processes with distinct Faradaic charge transfer. Herein, we report on an electrochemical system with separated CV peaks, accompanied by surface-controlled partial charge transfer, in 2D Ti3C2Tx MXene in water-in-salt electrolytes. The process involves the insertion/desertion of desolvation-free cations, leading to an abrupt change of the interlayer spacing between MXene sheets. This unusual behavior increases charge storage at positive potentials, thereby increasing the amount of energy stored. This also demonstrates opportunities for the development of high-rate aqueous energy storage devices and electrochemical actuators using safe and inexpensive aqueous electrolytes.
abnormal electrochemical behavior , charge storage mechanism , desolvation-free cation insertion , partial charge transfer , titanium carbide MXene , water-in-salt electrolytes
Text of the article Перейти на текст статьи
A. J. Drexel Nanomaterials Institute, Department of Materials Science and Engineering, Drexel University, Philadelphia, 19104, PA, United States
Department of Chemistry, University of California, Riverside, 92521, CA, United States
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, 37831, TN, United States
Department of Chemistry, Bar-Ilan University, Ramat-Gan, 52900, Israel
Materials Science Department - CIRIMAT, Université Toulouse III Paul Sabatier, 118 route de Narbonne, Toulouse, 31062, France
Center for Physical and Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, 37830, TN, United States
A. J. Drexel Nanomaterials Institute
Department of Chemistry
Chemical Sciences Division
Department of Chemistry
Materials Science Department - CIRIMAT
Center for Physical and Chemical Methods of Research and Analysis
Center for Nanophase Materials Sciences
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026