Journal article
Boosting the volumetric capacitance of MoO3-x free-standing films with Ti3C2 MXene
Electrochimica acta, v 370, 137665
20 Feb 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
•MoO3-x/Ti3C2 MXene free-standing films show high volumetric capacitances with excellent cyclability.•The asymmetric supercapacitors delivered maximum energy density of 48.6 Wh L−1 with outstanding output voltage (2.1 V).•The impressive electrochemical performance, low cost and green nature bode well for practical applications.
The high theoretical capacitance of molybdenum trioxide (MoO3) renders it an attractive supercapacitor electrode material. However, its low electronic conductivity restricts charge transfer and slows its reaction kinetics. Herein, we vacuum filtered porous, free-standing, flexible and highly conductive films comprised of oxygen vacancy-rich MoO3-x nanobelts and delaminated Ti3C2 MXene in a mass ratio of 80:20, respectively. When tested as supercapacitor electrodes, in a 5 M LiCl electrolyte, volumetric capacitances of 631 F cm−3 at 1 A g−1, and 474 F cm−3 at 10 A g−1 were obtained. To increase the energy density, asymmetric supercapacitors, wherein the anodes were MoO3-based and the cathodes were nitrogen-doped activated carbon were assembled and tested. The resulting volumetric energy density was 48.6 Wh L−1. After 20,000 continuous charge/discharge cycles at 20 A g−1, 96.3 % of the initial charge remained. These values are outstanding for free-standing supercapacitor electrodes, especially in aqueous electrolytes.
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Details
- Title
- Boosting the volumetric capacitance of MoO3-x free-standing films with Ti3C2 MXene
- Creators
- Wei Zheng - Linköping UniversityJoseph Halim - Linköping UniversityAhmed S. Etman - Linköping UniversityAhmed El Ghazaly - Thin Film Physics, Department of Physics, Chemistry and Biology (IFM), Linkoping University, SE-581 83 Linkoping, SwedenJohanna Rosen - Linköping UniversityMichel W. Barsoum - Drexel University
- Publication Details
- Electrochimica acta, v 370, 137665
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000623410600005
- Scopus ID
- 2-s2.0-85099451891
- Other Identifier
- 991019168615704721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Electrochemistry