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KCl-assisted activation: Moringa oleifera branch-derived porous carbon for high performance supercapacitor
KCl-assisted activation: Moringa oleifera branch-derived porous carbon for high performance supercapacitor
- Source :
- New Journal of Chemistry. 45:5712-5719
- Publication Year :
- 2021
- Publisher :
- Royal Society of Chemistry (RSC), 2021.
-
Abstract
- The effective preparation of high porosity carbonaceous electrode materials is a critical and challenging issue for obtaining superior supercapacitors. In this work, a novel KCl-assisted KOH strategy is developed for the preparation of Moringa oleifera branch-based porous carbon materials (PCMs). Benefiting from the liquid environment of in situ formed molten salts, KCl-assisted KOH activation can effectively decrease the usage of KOH, and thus increase the yield of PCMs from 9.8% to 15.6% whilst maintaining their high porosity. Therefore, the obtained PCMs possess a high specific surface area (i.e., 2314–3470 m2 g−1) and pore volume (i.e., 0.94–1.69 cm3 g−1). When used in supercapacitors, a typical PCM electrode exhibits a high capacitance of 421 F g−1 at 0.5 A g−1 and with an excellent cyclic stability of 4% capacity decay after 20 000 charge/discharge cycles in 6 M KOH electrolyte. Additionally, a maximum energy density of 33.0 W h kg−1 can be achieved at 224.0 W kg−1. This attractive electrochemical performance shows PCMs to be a promising material for use in supercapacitors. Furthermore, this research provides a cost-effective and promising route for the preparation of porous carbon with high porosity.
Details
- ISSN :
- 13699261 and 11440546
- Volume :
- 45
- Database :
- OpenAIRE
- Journal :
- New Journal of Chemistry
- Accession number :
- edsair.doi...........763b6153af80192b9c49207f9890655b
- Full Text :
- https://doi.org/10.1039/d1nj00046b