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Journal article
MXene//MnO2 Asymmetric Supercapacitors with High Voltages and High Energy Densities
Batteries & supercaps, v 5(10), pn/a
Oct 2022
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Aqueous asymmetric supercapacitors (AASCs) can have high voltages and high energy densities. However, the rational design of AASCs with proper negative and positive electrodes remains a challenge. Herein, we report on an AASC using Mo1.33CTz MXene films as the negative electrode, and tetramethylammonium cation intercalated birnessite (TMA+‐MnO2) films as the positive electrode in a 21 mol kg−1 lithium bis(trifluoromethanesulphonyl)imide (LiTFSI) electrolyte. Benefiting from a high, stable voltage of 2.5 V, an energy density of 86.5 Wh L−1 at 2 mV s−1 and a power density of 10.3 kW L−1 at 1 V s−1 were achieved. The cells also exhibit excellent cycling stability (>98 % after 1,0000 cycles at 100 mV s−1) and a 51.1 % voltage retention after 10 h. This good performance is attributed to the high stable potential window and high volumetric capacitances of both Mo1.33CTz and TMA+‐MnO2 electrodes in highly concentrated electrolytes. This work provides a roadmap for developing high performance AASCs with high voltages and high energy/power densities, with relatively slow self‐discharge rates.
High performed supercapacitor: 2D TMA+‐MnO2 birnessite flakes were obtained by heating Mn3O4 powders in TMAH solution. This technique is facile, inexpensive and scalable, with high yields and uses earth abundant materials. When coupled with 2D Mo1.33CTz MXene, the Mo1.33CTz(−)//TMA+‐MnO2(+) aqueous asymmetric supercapacitors have a high voltage (2.5 V), high energy and power densities (86.5 Wh L−1 at 2 mV s−1 and 10.3 kW L−1 at 1 V s−1), with slow self‐discharge rates.
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Details
- Title
- MXene//MnO2 Asymmetric Supercapacitors with High Voltages and High Energy Densities
- Creators
- Wei Zheng - Linköping UniversityJoseph Halim - Linköping UniversityLi Yang - Linköping UniversityHussein O. Badr - Drew UniversityZhengMing Sun - Southeast UniversityPer O. Å. Persson - Linköping UniversityJohanna Rosen - Linköping UniversityMichel W. Barsoum - Drexel University
- Publication Details
- Batteries & supercaps, v 5(10), pn/a
- Publisher
- Wiley
- Number of pages
- 8
- Grant note
- Strategic Research (SSF) (EM16-0004) Knut and Alice Wallenberg (KAW) foundation Swedish Foundation for Strategic Research (SSF) (RIF 14–0074)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000810453000001
- Scopus ID
- 2-s2.0-85131766894
- Other Identifier
- 991019169701204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Electrochemistry
- Materials Science, Multidisciplinary