Mechanically activated carbonized rayon fibers as an electrochemical supercapacitor in aqueous solutions
Authors
Vujković, Milica
Matovic, Ljiljana

Krstić, Jugoslav

Stojmenović, Marija

Dukić, Andelka
Babić, Biljana M.
Mentus, Slavko

Article (Accepted Version)
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The activated carbon cloth (ACC), obtained by chemical/physical activation of carbonized rayon fibers, was grinded in a ball mill and studied from the aspect of double layer capacitance. The changes in pore structure, morphology and acid/basic properties caused by ball milling were studied by means of N-2 adsorption/desorption, Fourier-transformed infrared spectrometry, Boehm's titration and Scanning Electron Microscopy. Both potentiodynamic and galvanostatic cycling were used to evaluate the double layer capacitance in three alkaline, acidic and neutral aqueous solutions (KOH, H2SO4 and Na2SO4). While double layer capacitance of original ACC was found to be negligible, ball milled material (ACCm) displayed capacitance in the range of supercapacitors. In order to explain this huge capacitance improvement, we found that ball milling substantially increased the concentration of lactone, phenolic and quinone groups on the surface. We suggest that these groups, through improved hydrophilic...ity, enable faster ion diffusion into carbon micropores. The energy density stored by double layer was highest in neutral sodium sulphate solution. Namely, operational voltage of similar to 2 V and double layer capacitance of 220 F g(-1) at 1A g(-1), enable the energy density of ACCm/Na2SO4/ACCm capacitor of 31.7 Wh kg(-1) at 2000 W kg(-1), much higher than that of commercial EDLC carbon capacitors. According to the here presented literature survey in a tabular form, the energy density of the studied sample is also higher from that of numerous thus far published aqueous carbon capacitors.
Keywords:
carbon supercapacitor / mechanochemical activation / Na2SO4 aqueous electrolyte / high energySource:
Electrochimica Acta, 2017, 245, 796-806Publisher:
- Pergamon-Elsevier Science Ltd, Oxford
Projects:
- Lithium-ion batteries and fuel cells - research and development (RS-45014)
- Synthesis, processing and characterization of nanostructured materials for application in the field of energy, mechanical engineering, environmental protection and biomedicine (RS-45012)
- Serbian Academy of Sciences and Arts "Electrocatalysis in the contemporary processes of energy conve
- NATO through the Science for Peace Project - EAP. SFPP 984925-DURAPEM
Note:
- This is peer-reviewed version of the article: Milica Vujkovic, Ljiljana Matovic, Jugoslav Krstic, Marija Stojmenovic, Anelka Ðukic, Biljana Babic, Slavko Mentus, Mechanically activated carbonized rayon fibers as an electrochemical supercapacitor in aqueous solutions, Electrochimica Acta 2017, 245, 796-806, https://dx.doi.org/10.1016/j.electacta.2017.06.018
- http://cer.ihtm.bg.ac.rs/handle/123456789/2135
DOI: 10.1016/j.electacta.2017.06.018
ISSN: 0013-4686