Resourceful utilization of methylene blue-contaminated water for the fabrication of an ultra-stable supercapacitor device
- Authors
- Acharya, Sourav; Bag, Subhodip; De, Shrabani; Maity, Chandan Kumar; Nayak, Ganesh Chandra
- Issue Date
- Feb-2023
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- SUSTAINABLE ENERGY & FUELS, v.7, no.4, pp 1011 - 1026
- Pages
- 16
- Journal Title
- SUSTAINABLE ENERGY & FUELS
- Volume
- 7
- Number
- 4
- Start Page
- 1011
- End Page
- 1026
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/91873
- DOI
- 10.1039/d2se01022d
- ISSN
- 2398-4902
- Abstract
- The current work reports a unique solution for two of the major problems of the 21st century, dye-contaminated water and the increasing demand for energy storage devices. Methylene blue, from contaminated water, was utilized to enhance the electrochemical performance of a supercapacitor electrode through adsorption and subsequent stabilization. Firstly, carbon obtained from the carbonization of waste grass was converted to carbon-SnS2 composite through a single-step hydrothermal process. The synthesized composite was subsequently used to remove methylene blue from the contaminated water with a removal efficiency of 40 mg g(-1) in 20 min. The adsorbed methylene blue was stabilized on the adsorbent through heat treatment, forming S- and N-doped carbon, thus enhancing the electrochemical performance of asymmetric supercapacitor device. The methylene blue-stabilized composite achieved highest specific capacitance of 426.5 F g(-1) at 2 A g(-1) in a 3-electrode setup. A device fabricated with this sample as the cathode and carbonized grass as the anode achieved a maximum specific capacitance of 98.3 F g(-1) with an energy density of 44.3 W h kg(-1) at a high power density of 1.8 kW kg(-1). The device showed high capacitance retention of 97% after 10 000 charging-discharging cycles, which is excellent for practical applications.
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