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Status: 
| Verfasst von: | Sylla, Ndeye F. |
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| | Ndiaye, Ndeye M. |
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| | Ngom, Balla D. |
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| | Mutuma, Bridget K. |
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| | Momodu, Damilola |
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| | Chaker, Mohamed |
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| | Manyala, Ncholu |
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| Titel: | Ex-situ nitrogen-doped porous carbons as electrode materials for high performance supercapacitor |
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| Verlagsort: | United States |
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| Verlag: | Elsevier Inc |
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| Jahr: | 2020 |
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| Fussnoten: | ObjectType-Article-1 ; ObjectType-Feature-2 ; SourceType-Scholarly Journals-1 ; content type line 23 |
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| Inhalt: | [Display omitted]
Nitrogen (N) doping of porous carbon materials is an effective strategy for enhancing the electrochemical performance of electrode materials. Herein, we report on ex-situ (post) nitrogen-doped porous carbons prepared using a biomass waste, peanut shell (PS) as a carbon source and melamine as the nitrogen source. The synthesis method involved a two-step mechanism, initial chemical activation of the PS using KOH and post N-doping of the activated carbon. The effect of the activating agent/precursor ratio and the ex-situ N-doping on the structural, textural, electrochemical properties of the porous carbons was studied. The ex-situ N-doped porous carbon with an optimum amount of KOH to PS exhibited the best capacitance performance with a specific surface area (SSA) of 1442 m2 g−1 and an enriched nitrogen content (3.2 at %). The fabricated symmetric device exhibited a 251.2 F g−1 specific capacitance per electrode at a gravimetric current of 1 A g−1 in aqueous electrolyte (2.5 M KNO3) at a wide cell voltage of 2.0 V. A specific energy of 35 Wh kg−1 with a corresponding specific power of 1 kW kg−1 at 1 A g−1 was delivered with the device still retaining up to 22 Wh kg−1 and a 20 kW kg−1 specific power even at 20 A g−1. Moreover, long term device stability was exhibited with an 83.2% capacity retention over 20 000 charge/discharge cycles and also a good rate capability after 180 h of floating at 5 A g−1. This great performance of the symmetric supercapacitor can be correlated to the surface porosity and post nitrogen-doping effect which increased the electrochemically-active sites resulting in a remarkable charge storage capability. |
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| ISSN: | 0021-9797 |
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| Titel Quelle: | Journal of colloid and interface science |
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| Jahr Quelle: | 2020 |
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| Band/Heft Quelle: | 569, S. 332-345 |
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| DOI: | doi:10.1016/j.jcis.2020.02.061 |
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| URL: | http://www.ub.uni-heidelberg.de/cgi-bin/edok?dok=https%3A%2F%2Ffanyv88.com%3A443%2Fhttps%2Fdx.doi.org%2F10.1016%2Fj.jcis.2020.02.061 |
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| | http://www.ub.uni-heidelberg.de/cgi-bin/edok?dok=https%3A%2F%2Ffanyv88.com%3A443%2Fhttps%2Fwww.ncbi.nlm.nih.gov%2Fpubmed%2F32126346 |
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| | http://www.ub.uni-heidelberg.de/cgi-bin/edok?dok=https%3A%2F%2Ffanyv88.com%3A443%2Fhttps%2Fsearch.proquest.com%2Fdocview%2F2371145949 |
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| | DOI: https://doi.org/10.1016/j.jcis.2020.02.061 |
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| Sprache: | English |
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| Sach-SW: | Biomass |
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| | Chemical activation |
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| | Nitrogen-doped carbon |
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| | Porosity |
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| | Supercapacitor |
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| Verknüpfungen: | → Sammelwerk |
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