Waste coffee grounds-derived nanoporous carbon nanosheets for supercapacitors
Waste coffee grounds-derived nanoporous carbon nanosheets for supercapacitors
- 한국탄소학회
- Carbon Letters
- 제19권
- : SCOPUS, SCIE, KCI등재
- 2016.07
- 66 - 71 (6 pages)
The development of nanostructured functional materials derived from biomass and/or waste is of growing importance for creating sustainable energy-storage systems. In this study, nanoporous carbonaceous materials containing numerous heteroatoms were fabricated from waste coffee grounds using a top-down process via simple heating with KOH. The nanoporous carbon nanosheets exhibited notable material properties such as high specific surface area (1960.1 m2 g?1), numerous redox-active heteroatoms (16.1 at% oxygen, 2.7 at% nitrogen, and 1.6 at% sulfur), and high aspect ratios (>100). These unique properties led to good electrochemical performance as supercapacitor electrodes. A specific capacitance of ~438.5 F g?1 was achieved at a scan rate of 2 mV s?1, and a capacitance of 176 F g?1 was maintained at a fast scan rate of 100 mV s?1. Furthermore, cyclic stability was achieved for over 2000 cycles.
1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusions
References