Char of Tagetes erecta (African marigold) flower as a potential electrode material for supercapacitors

Original scientific paper


  • Venkata Naga Kanaka Suresh Kumar Nersu Department of Instrument Technology, Andhra University College of Engineering (A), Visakhapatnam, Andhra Pradesh 530003, India
  • Bhujanga Rao Annepu Department of Instrument Technology, Andhra University College of Engineering (A), Visakhapatnam, Andhra Pradesh 530003, India
  • Subhakaran Singh Rajaputra Centre for Advanced Energy Studies, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India
  • Satya Srinivasa Babu Patcha Center for Flexible Electronics, Department of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India



Biochar, gel polymer electrolyte, flower waste, electric double layer capacitor (EDLC), carbon cloth, hydrophilicity
Graphical Abstract


A char of Tagetes erecta flowers (TFC) was derived through simple thermal decompo­sition of Tagetes erecta flowers (TF). Physico-chemical properties of as-prepared TFC were evaluated using XRD, FESEM, FTIR, TGA, N2 adsorption-desorption isotherm analysis and water contact angle measurements. The practicality and applicability of TFC as promising electrode material in supercapacitors (SCs) were evaluated in full-cell configuration by performing electrochemical characterizations like CV, GCD and EIS on a lab-scale TFC-based symmetric SC. TFC exhibited a remarkable specific capacitance of 118.4 F g-1 at a constant current density of 0.2 A g-1 and a specific energy of 4.1 Wh kg-1 at specific power of 0.1 kW kg-1. TFC showed excellent cyclic stability by retaining 92 % of its initial capacitance even after 6000 GCD cycles at 2 A g-1. The superior capacitive behaviour and cyclic stability of TFC could be attributed to its good wettability towards water. This excellent supercapacitive performance of TFC estab­lishes it as a potential floral waste-derived carbon-based electrode material for SCs.


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How to Cite

Nersu, V. N. K. S. K., Annepu, B. R. ., Rajaputra, S. S., & Patcha, S. S. B. (2022). Char of Tagetes erecta (African marigold) flower as a potential electrode material for supercapacitors: Original scientific paper. Journal of Electrochemical Science and Engineering, 12(4), 787–797.



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