Journal article
Effect of vacancies on the electrochemical behavior of Mo-based MXenes in aqueous supercapacitors
Journal of power sources, v 525, 231064
30 Mar 2022
Abstract
i-MXenes, a new family of 2D transition metal carbides with in-plane ordered vacancies, have shown great potential in aqueous supercapacitor (SC) applications due to their high volumetric capacitances and energy densities. However, how vacancies affect their electrochemical performance, in general, and their self-discharge (SD) behavior in particular, remains unexplored. Herein, we compare the electrochemical performance of vacancy-rich, ordered Mo1.33CTzi-MXene to that of Mo2CTz (with much less vacancies) in a 1 M sulfuric acid (H2SO4) or 15 M of lithium bromide (LiBr) electrolyte. The Mo1.33CTz exhibits higher volumetric capacitances and energy densities, but at the cost of a higher SD rate. Specifically, the Mo1.33CTz symmetric SCs deliver an energy density as high as 25.4 mWh cm−3 at 152.4 mW cm−3, with 65.4% voltage retention after 10 h in 15 M LiBr. In comparison, the Mo2CTz symmetric SCs have a maximum energy density of 20.8 mWh cm−3 at 124.9 mW cm−3, with 73.1% voltage retention after 10 h in the same electrolyte. The SD rates in the H2SO4 electrolyte are quite rapid.
•The self-discharge behavior of i-MXene-based SCs is still virgin territory.•Mo1.33CTzi-MXene has higher energy/power densities but faster self-discharge.•The tradeoff between self-discharge and other performance needs to be considered.
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Details
- Title
- Effect of vacancies on the electrochemical behavior of Mo-based MXenes in aqueous supercapacitors
- Creators
- Wei Zheng - Linköping UniversityJoseph Halim - Linköping UniversityPer O.Å. Persson - Materials Design Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, 581 83, Linköping, SwedenJohanna Rosen - Linköping UniversityMichel W. Barsoum - Drexel University
- Publication Details
- Journal of power sources, v 525, 231064
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000781812100003
- Scopus ID
- 2-s2.0-85124097173
- Other Identifier
- 991019168460104721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Electrochemistry
- Energy & Fuels
- Materials Science, Multidisciplinary