2024-03-28T10:04:21Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1988812021-11-15T05:30:35Zcom_10261_84com_10261_5col_10261_337
Suárez Fernández, Loreto
Álvarez Centeno, Teresa
2020-01-24T12:14:54Z
2020-01-24T12:14:54Z
2019-11-14
Journal of Power Sources 448: 227413 (2020)
0378-7753
http://hdl.handle.net/10261/198881
10.1016/j.jpowsour.2019.227413
http://dx.doi.org/10.13039/100011941
With the awareness of the need for low-cost carbons for supercapacitors, the recycling of biomass wastes as precursors of activated carbons is focusing great interest. The comparison of a diversity of carbons derived from residues of industrial processing of grapes, apples and cherries reveals the utility of physical activation to achieve better volumetric performance in aqueous supercapacitors. Whereas the high porosity development of the materials obtained by KOH activation (mostly around 1500–2000 m2 g-1) provides a superior gravimetric capacitance up to nearly 300 F g-1 in 2 M H2SO4, the low density of the electrodes reduces the volumetric capacitance to 60–130 Fcm−3.
Porous carbons produced by steam or CO2 reaches higher efficiency for compact devices. The physically activated materials display an ultramicroporous structure with standard surface areas of around 900 m2 g−1 and, therefore, their gravimetric capacitance is limited to 100–150 F g-1. However, harnessing the balance of porosity, density and good packaging, the corresponding electrodes reach 80–170 F cm−3, without sacrificing power delivery by the supercapacitor. Higher carbon yield and lower environmental impact represent additional advantages of the physical activation to produce biomass wastes derived-carbons.
eng
https://creativecommons.org/licenses/by-nc-nd/4.0/
openAccess
Biomass derived-carbon
Gravimetric capacitance
Volumetric capacitance
Electrode density
Supercapacitor
Unravelling the volumetric performance of activated carbons from biomass wastes in supercapacitors
artículo