Journal article
Porous Cryo-Dried MXene for Efficient Capacitive Deionization
Joule, v 2(4), pp 778-787
18 Apr 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Aerogel-like, porous Ti3C2Tx MXene architecture electrode displayed a high electroadsorption capacity for capacitive deionization of saline water. A vacuum freeze-drying process was employed to prevent the restacking of MXene nanosheets due to van der Waals forces, leading to the formation of a porous structure with a large specific surface area. When applied as electrode materials for capacitive deionization, porous MXene demonstrated a high specific capacitance of 156 F/g and a volumetric capacitance of 410 F/cm3 in 1 M sodium chloride (NaCl) electrolyte. The porous Ti3C2Tx MXene electrodes can deliver a high electroadsorption capacity of 118 mg/cm3 (45 mg/g) in 10,000 mg/L NaCl solution (applied voltage: 1.2 V) and excellent cycling stability (up to 60 cycles) in comparison with the restacked MXene and activated carbon electrodes, indicating its promising potential for desalination applications.
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•Novel synthesis of aerogel-like porous MXene architectures•Porous MXene architectures can effectively prevent the restack of MXene nanosheets•Porous MXene demonstrated a high electroadsorption capacity•MXene electrodes achieved a high capacitive deionization capacity
We report a rationally designed process to produce an aerogel-like porous MXene electrode material for capacitive deionization. The intercalation-delamination of organic compounds and a vacuum freeze-drying technique were employed to prevent the restacking of MXene nanosheets due to van der Waals forces. The porous Ti3C2Tx is hydrophilic and has a well-defined porous structure with a high surface area and high electrical conductivity. When applied as electrodes in a capacitive deionization cell, porous Ti3C2Tx MXene electrodes exhibited an impressively high ion adsorption capacity of 118 mg/cm3 in a salt solution with the concentration of 10,000 mg/L, which is more than 12 times higher than previously reported carbon-based electrode materials. The porous MXene materials may open a new avenue for high-performance capacitive desalination.
Porous Ti3C2Tx MXene architectures were prepared and used as electrode materials with a high electrosorption capacity for capacitive deionization of saline or brackish water. The porous Ti3C2Tx MXene electrodes can deliver a high electrosorption capacity of 118 mg/cm3 (45 mg/g) in 10,000 mg/L NaCl solution (applied voltage: 1.2 V), indicating its promising application in pure water production.
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Details
- Title
- Porous Cryo-Dried MXene for Efficient Capacitive Deionization
- Creators
- Weizhai Bao - Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, AustraliaXiao Tang - Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, AustraliaXin Guo - Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, AustraliaSinho Choi - Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, AustraliaChengyin Wang - College of Chemistry and Chemical Engineering, Yangzhou University, 180 Si-Wang-Ting Road, Yangzhou 225002, ChinaYury Gogotsi - A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USAGuoxiu Wang - Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia
- Publication Details
- Joule, v 2(4), pp 778-787
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000435091900019
- Scopus ID
- 2-s2.0-85045579917
- Other Identifier
- 991014969882004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Materials Science, Multidisciplinary