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Application of octanohydroxamic acid for liquid-liquid extraction of manganese oxides and fabrication of supercapacitor electrodes
- Source :
- Journal of Colloid and Interface Science. 515:50-57
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- MnO2 and Mn3O4 particles were prepared by wet chemical methods and efficiently dispersed and mixed with multiwalled carbon nanotubes (MWCNT) for the fabrication of composite MnO2-MWCNT and Mn3O4-MWCNT electrodes for electrochemical supercapacitors (ES). The problem of particle agglomeration was addressed by particle extraction through a liquid-liquid interface (PELLI) using octanohydroxamic acid (OHA) as a new extractor. OHA exhibited remarkable adsorption on particles due to a bidentate bonding mechanism. The use of OHA broadened the application of PELLI technology, because it allowed good extraction of particles from an aqueous phase at high pH. Moreover, OHA allowed efficient extraction by strong adsorption on particles not only at the liquid-liquid interface, but also in the bulk of an aqueous phase. Building on the advantages offered by the PELLI method and OHA as an extractor we found that Mn3O4-MWCNT electrodes exhibited a remarkably high capacitance of 4.2F cm−2. Another major finding was that capacitance of Mn3O4-MWCNT electrodes was higher than that of MnO2-MWCNT electrodes at active mass of 33 mg cm−2. This finding showed processing advantages of PELLI and paved the way for applications of novel colloidal and surface modification strategies for the development of advanced ES. A conceptually new approach has been proposed based on the use of hydroxamic acids as capping agents for synthesis and extractor molecules for PELLI.
- Subjects :
- Supercapacitor
Materials science
Extraction (chemistry)
Aqueous two-phase system
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Biomaterials
Colloid
Colloid and Surface Chemistry
Adsorption
Chemical engineering
Electrode
Particle
Surface modification
0210 nano-technology
Subjects
Details
- ISSN :
- 00219797
- Volume :
- 515
- Database :
- OpenAIRE
- Journal :
- Journal of Colloid and Interface Science
- Accession number :
- edsair.doi.dedup.....2ffc8ee70420125418386f44b88bdf5e