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Stable ionic-liquid-based symmetric supercapacitors from Capsicum seed-porous carbons

Momodu, Damilola (författare)
Universiteit van Pretoria,University of Pretoria
Sylla, Ndeye Fatou (författare)
Universiteit van Pretoria,University of Pretoria
Mutuma, Bridget (författare)
Universiteit van Pretoria,University of Pretoria
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Bello, Abdulhakeem (författare)
African University of Science and Technology (AUST),Universiteit van Pretoria,University of Pretoria
Masikhwa, Tshifhiwa (författare)
Universiteit van Pretoria,University of Pretoria
Lindberg, Simon, 1987 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
Matic, Aleksandar, 1968 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
Manyala, Ncholu (författare)
Universiteit van Pretoria,University of Pretoria
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 (creator_code:org_t)
Elsevier BV, 2019
2019
Engelska.
Ingår i: Journal of Electroanalytical Chemistry. - : Elsevier BV. - 1572-6657. ; 838, s. 119-128
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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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

TEKNIK OCH TEKNOLOGIER  -- Kemiteknik -- Kemiska processer (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)
NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Kemiteknik -- Annan kemiteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Chemical Engineering -- Other Chemical Engineering (hsv//eng)
NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)

Nyckelord

Ionic electrolyte
Cyclic stability
Nanoporous carbons
High specific energy
Biomass waste

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