Boosting the capacity of MXene electrodes in neutral aqueous electrolytes
Malchik F. Maldybayev K. Kan T. Kokhmetova S. Chae M.S. Kurbatov A. Galeyeva A. Kaupbay O. Nimkar A. Bergman G. Levi N. Zhang H. Jin Q. Lin Z. Shpigel N. Mandler D.
19 July 2023Cell Press
Cell Reports Physical Science
2023#4Issue 7
The use of Ti3C2Tx (MXene) electrodes for energy storage applications is gaining momentum. Considering the low flammability, high safety, and low cost of neutral aqueous electrolyte solutions, significant efforts have been devoted to the utilization of MXenes in this environment. However, despite the high stability and the excellent rate capability of MXene electrodes in neutral aqueous electrolytes, their capacity remains insufficient, usually below 30 mAh/g. This work aims to benefit from the spontaneous oxidation of MXene materials under ambient conditions to produce TiO2-coated MXene flakes. By using concentrated lithium chloride solutions, an extended potential window is obtained, allowing reversible insertion of lithium ions into MXene flakes and titanium dioxide nanoparticles. This results in significant capacity enhancement in MXene electrodes (by more than 200%) without impeding the MXene capacitive activity or its mechanical integrity. The prepared electrode presents long-term stability and high rate capability.
aqueous electrolyte , hybrid batteries , MXene , supercapacitors , Ti3C2Tx , TiO2 , water in salt
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Center of Physical-Chemical Methods of Research and Analysis, al-Farabi Kazakh National University, Almaty, 050012, Kazakhstan
Department of Nanotechnology Engineering, Pukyong National University, Busan, 48547, South Korea
Department of Chemistry and BINA – BIU Center for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
School of Microelectronics and Materials Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China
Institute of Chemistry, the Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
Center of Physical-Chemical Methods of Research and Analysis
Department of Nanotechnology Engineering
Department of Chemistry and BINA – BIU Center for Nanotechnology and Advanced Materials
Advanced Membranes and Porous Materials Center
School of Microelectronics and Materials Engineering
College of Materials Science and Engineering
Institute of Chemistry
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