Back to Search
Start Over
Rationally tuning ratio of micro- to meso-pores of biomass-derived ultrathin carbon sheets toward supercapacitors with high energy and high power density.
- Source :
-
Journal of Colloid & Interface Science . Jan2022:Part 1, Vol. 606, p817-825. 9p. - Publication Year :
- 2022
-
Abstract
- Schematic illustration of the effect of the electrode pore structure on electrochemical supercapacitor performance. [Display omitted] The carbon pore structure could have a significant effect on supercapacitor performance; however, this effect has not yet been systematically studied. A facile approach for synthesizing porous, ultrathin carbon sheets while rationally tuning the ratio of micro-to meso -pores via partial corrosion has been developed for the fabrication of high-performance devices. The prepared carbon from biomass with an optimal ratio of micro- to meso -pores has a large specific surface area of 1785 m2 g −1, a high specific capacitance of 447F g −1 at 0.5 A g−1, a high energy density of 15.5–9.7 Wh kg−1, and an excellent power density of 0.062–6.24 kW kg−1. After 10,000 charge–discharge cycles, the capacitance retention was maintained at 95%, which exceeded most of the biomass-carbon-based capacitors. Volcano relationships were found to exist through plots of both specific surface area and specific capacitance versus the micro-to meso -pore ratio. An enhancement mechanism with a rational pore structure is proposed, which not only networks micropores to remove died-end micropores to achieve the largest specific active surface area and high specific capacitance but also realizes fast mass-transport channels, resulting in high power density. This work provides an effective approach based on waste re-use by tuning a rational pore structure for achieving high energy/power density toward green energy applications with universal significance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 606
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 154374977
- Full Text :
- https://doi.org/10.1016/j.jcis.2021.08.042