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Stable ionic-liquid...
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Momodu, DamilolaUniversiteit van Pretoria,University of Pretoria
(författare)
Stable ionic-liquid-based symmetric supercapacitors from Capsicum seed-porous carbons
- Artikel/kapitelEngelska2019
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Nummerbeteckningar
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LIBRIS-ID:oai:research.chalmers.se:819ac4cf-7907-4d3e-a409-61313f344f50
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https://doi.org/10.1016/j.jelechem.2019.02.045DOI
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https://research.chalmers.se/publication/509020URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
Anmärkningar
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In this study, a symmetric ionic-liquid based supercapacitor was assembled with porous carbon derived from Capsicum (bell pepper) seeds. The “peppered”-activated carbon (ppAC) was synthesized using varying amounts of KHCO 3 activating agent (AA) at 850 °C carbonization temperature. The best device performance reported was recorded with optimum amounts of AA to raw material. The need for less amount of AA is crucial if the entire activation/carbonization process is to be scaled-up with the cost and final product yield also being important for a viable synthesis. A mechanism of saturation of pores with unreacted AA which leads to lower porosity metrics in the samples with increasing the amount of AA during carbonization/activation was also proposed. Using an ionic liquid electrolyte, 1-ethyl-3-methylimidazolium bistrifluorosulfonylimide (EMIM-TFSI), the ppAC-based supercapacitor operated up to a maximum cell voltage of 3.20 V. A specific energy of 37 Wh kg −1 was obtainable with a corresponding practical power density of 0.6 kW kg −1 at 0.5 A g −1 . A specific energy of ∼26 Wh kg −1 was still achievable when the applied current was doubled to 1.0 A g −1 and a high cyclic stability (approx. 99% coulombic efficiency) was proven over 25,000 cycles. Further ageing test performed on the device revealed a remarkable improvement in the electrochemical performance after a 180 h (ca. 1 week) floating time. The obtained results also confirmed a uniquely distributed porous carbon in which the complete utilization of the entire less-corrosive KHCO 3 AA for optimal pore activation at elevated carbonization temperatures. Thus, the efficient design combinations for stable, high-energy and power ionic liquid-based supercapacitors with cheaper biomass-based materials are demonstrated.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Sylla, Ndeye FatouUniversiteit van Pretoria,University of Pretoria
(författare)
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Mutuma, BridgetUniversiteit van Pretoria,University of Pretoria
(författare)
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Bello, AbdulhakeemAfrican University of Science and Technology (AUST),Universiteit van Pretoria,University of Pretoria
(författare)
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Masikhwa, TshifhiwaUniversiteit van Pretoria,University of Pretoria
(författare)
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Lindberg, Simon,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lisimo
(författare)
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Matic, Aleksandar,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matic
(författare)
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Manyala, NcholuUniversiteit van Pretoria,University of Pretoria
(författare)
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Universiteit van PretoriaAfrican University of Science and Technology (AUST)
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Electroanalytical Chemistry: Elsevier BV838, s. 119-1281572-6657
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