Influence of K3Fe(CN)6 on the electrochemical performance of carbon derived from waste tyres by K2CO3 activation

• Published in: Materials chemistry and physics Vol. 209; pp. 262 - 270
• Main Authors: Bello, A., Momodu, D.Y., Madito, M.J., Makgopa, K., Rambau, K.M., Dangbegnon, J.K., Musyoka, N.M., Manyala, N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2018
• Subjects: Electrochemical properties; Porous carbon; Redox-mediated electrolyte; Supercapacitors; Waste tyres; Supercapacitors; Redox-mediated electrolyte; Electrochemical properties; Porous carbon; Waste tyres
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2018.02.005

Revalorisation of waste tyres to sustainable value added carbons was studied as a possible means of addressing the challenges with rising demand for energy across the globe. Crumble tyres were used for the production of activated carbon (AC) in the presence of potassium carbonate (K2CO3) salt as the activating agent. The activated carbon (AC) materials exhibited predominantly mesoporous framework with specific surface area between 147 and 385 m2 g−1. Fabricated electrodes from these AC materials displayed a discharge capacity of 50 mAh g−1 at 0.25 A g−1 in a redox-mediated electrolyte of 1 M K3Fe(CN)6-1 M HNO3 corresponding to a specific capacitance of 140 F g−1 at the same specific current, with an energy efficiency of 70% after 1000 cycles. The enhanced electrochemical performance of the electrode is due to a coupling electrolyte additive, which offers an alternative approach for the design of an efficient electrochemical energy storage device. [Display omitted] •Revalorisation of waste tyres as a means to sustainable value added porous carbon.•K2CO3 activation and carbonization of the hydrochar to produce porous carbons.•Electrodes based on the porous carbon exhibit good electrochemical performance.•Investigate the influence of redox-mediated electrolytes on the porous carbon.