Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 21, Issue 3, Pages 859-872Publisher
SPRINGER
DOI: 10.1007/s10008-016-3432-z
Keywords
Activated carbon; Tree bark; Biomass waste; Supercapacitor; Neutral electrolyte
Categories
Funding
- South African Research Chairs Initiative of the Department of Science and Technology, Republic of South Africa
- National Research Foundation of South Africa [97994]
- University of Pretoria
Ask authors/readers for more resources
Activated carbon from tree bark (ACB) has been synthesized by a facile and environmentally friendly activation and carbonization process at different temperatures (600, 700 and 800 A degrees C) using potassium hydroxide (KOH) pellets as an activation agent with different mass loading. The physicochemical and microstructural characteristics of the as-obtained material revealed interconnected microporous/mesoporous architecture with increasing trend in specific surface area (SSA) as carbonization temperatures rises. The SSA values of up to 1018 m(2) g(-1) and a high pore volume of 0.67 cm(3) g(-1) were obtained. The potential of the ACB material as suitable supercapacitor electrode was investigated in both a three and two-electrode configuration in different neutral aqueous electrolytes. The electrodes exhibited electric double-layer capacitor (EDLC) behaviour in all electrolytes with the Na2SO4 electrolyte working reversibly in both the negative (-0.80 V to -0.20 V) and positive (0.0 V to 0.6 V) operating potentials. A specific capacitance (C (s) ) of up to 191 F g(-1) at a current density of 1 A g(-1) was obtained for the optimized ACB electrode material in 1 M Na2SO4 electrolyte. A symmetric device fabricated exhibited specific C (s) of 114 F g(-1) at 0.3 A g(-1) and excellent stability with a coulombic efficiency of a 100 % after 5000 constant charge-discharge cycles at 5.0 A g(-1) and a low capacitance loss for a floating time of 70 h.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available