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Journal article
Surface Redox Pseudocapacitance of Partially Oxidized Titanium Carbide MXene in Water-in-Salt Electrolyte
ACS energy letters, v 7(1), pp 30-35
14 Jan 2022
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Achieving pseudocapacitive intercalation in MXenes with neutral aqueous electrolytes and driving reversible redox reactions is scientifically appealing and practically useful. Here, we report that the partial oxidation of MXene intensifies pseudocapacitive Li+ intercalation into Ti3C2T x MXene from neutral water-in-salt electrolytes. An in situ X-ray absorption near-edge structure analysis shows that the Ti oxidation state changes during the Li+ intercalation, indicating the presence of a surface redox reaction. The Ti oxidation/reduction is further confirmed by an in situ extended X-ray absorption fine structure analysis, which shows a reversible contraction/expansion of the Ti–C interatomic distance. The intensified Li+ pseudocapacitive intercalation can be explained by the higher oxidation state of Ti at the open circuit potential. This work demonstrates the possibility of tuning the pseudocapacitive intercalation by adjusting the initial oxidation state of the transition metal on the MXene and offers a facile way to enhance the pseudocapacitance of various MXenes.
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Details
- Title
- Surface Redox Pseudocapacitance of Partially Oxidized Titanium Carbide MXene in Water-in-Salt Electrolyte
- Creators
- Xuehang Wang - Drexel UniversitySeong-Min Bak - Brookhaven National LaboratoryMeikang Han - Drexel UniversityChristopher E Shuck - Drexel UniversityConlan McHugh - Drexel UniversityKe Li - Drexel UniversityJianmin Li - Drexel UniversityJun Tang - Drexel UniversityYury Gogotsi - Drexel University, Materials Science and Engineering
- Publication Details
- ACS energy letters, v 7(1), pp 30-35
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; A.J. Drexel Nanomaterials Institute
- Web of Science ID
- WOS:000769973900005
- Scopus ID
- 2-s2.0-85120630324
- Other Identifier
- 991019167346504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Electrochemistry
- Energy & Fuels
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology