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Journal article
Free-Standing alpha-MoO3/Ti3C2 MXene Hybrid Electrode in Water-in-Salt Electrolytes
Energy & environmental materials (Hoboken, N.J.)
03 Jan 2023
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
While transition-metal oxides such as alpha-MoO3 provide high capacity, their use is limited by modest electronic conductivity and electrochemical instability in aqueous electrolytes. Two-dimensional (2D) MXenes, offer metallic conductivity, but their capacitance is limited in aqueous electrolytes. Insertion of partially solvated cations into Ti3C2 MXene from lithium-based water-in-salt (WIS) electrolytes enables charge storage at positive potentials, allowing a wider potential window and higher capacitance. Herein, we demonstrate that alpha-MoO3/Ti3C2 hybrids combine the high capacity of alpha-MoO3 and conductivity of Ti3C2 in WIS (19.8 m LiCl) electrolyte in a wide 1.8 V voltage window. Cyclic voltammograms reveal multiple redox peaks from alpha-MoO3 in addition to the well-separated peaks of Ti3C2 in the hybrid electrode. This leads to a higher specific charge and a higher rate capability compared to a carbon and binder containing alpha-MoO3 electrode. These results demonstrate that the addition of MXene to less conductive oxides eliminates the need for conductive carbon additives and binders, leads to a larger amount of charge stored, and increases redox capacity at higher rates. In addition, MXene encapsulated alpha-MoO3 showed improved electrochemical stability, which was attributed to the suppressed dissolution of alpha-MoO3. The work suggests that oxide/MXene hybrids are promising for energy storage.
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Details
- Title
- Free-Standing alpha-MoO3/Ti3C2 MXene Hybrid Electrode in Water-in-Salt Electrolytes
- Creators
- Mohit Saraf - Drexel UniversityChristopher E. Shuck - Drexel UniversityNazgol Norouzi - Drexel UniversityKyle Matthews - Drexel UniversityAlex Inman - Drexel UniversityTeng Zhang - Drexel UniversityEkaterina Pomerantseva - Drexel UniversityYury Gogotsi - Drexel University
- Publication Details
- Energy & environmental materials (Hoboken, N.J.)
- Publisher
- Wiley
- Number of pages
- 9
- Grant note
- 2558/FNPDR/2020 / United States-India Educational Foundation, New Delhi, India DE-SC0012673 / U.S. Department of Energy, Office of Science, Basic Energy Sciences; United States Department of Energy (DOE) U.S. Department of Energy, Office of Science, Basic Energy Sciences; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; A.J. Drexel Nanomaterials Institute
- Web of Science ID
- WOS:000911419800001
- Scopus ID
- 2-s2.0-85145475441
- Other Identifier
- 991020008557104721
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Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Materials Science, Multidisciplinary