Rice husk char 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, Andhrapradesh 530003, India https://orcid.org/0000-0003-0150-2814
  • Bhujanga Rao Annepu Department of Instrument Technology, Andhra University College of Engineering (A), Visakhapatnam, Andhrapradesh 530003, India
  • Satya Srinivasa Babu Patcha Center for Flexible Electronics, Department of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India https://orcid.org/0000-0002-9597-4873
  • Subhakaran Singh Rajaputra Centre for Advanced Energy Studies, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India https://orcid.org/0000-0003-1049-2275
Keywords: Biochar, carbon-SiO2 composite, superhydrophilicity, carbon cloth, nanocomposite gel polymer electrolyte, electric double layer capacitor (EDLC)
Graphical Abstract


Rice husk char (RHC), a carbon-based material, was obtained by thermal decomposition of rice husk (RH) biological waste. Physicochemical properties of RHC were determined using XRD, FTIR, FESEM, TGA, N2 adsorption-desorption studies and contact angle mea­surement. A lab-scale supercapacitor (SC) was fabricated using as-prepared RHC and its super­capa­citive behaviour was investigated using techniques like CV, GCD and EIS studies. Each of RHC electrode showed a specific capacitance of 80.2 F g-1 at the constant charging/disharging current density of 0.05 A g-1. RHC exhibited 90 % retention of its initial capacitance even after 5000 GCD. The presence of amorphous SiO2 in RHC could contribute to the excellent wettability of RHC towards the water, enhancing its effective sur­face area by improving access of electrolyte ions into RHC. This remarkable super­capa­citi­ve performance of biological waste-derived RHC demonstrates its potential as a cost ef­fecttive and environ­mentally benign electrode material for aqueous electrolyte-based SCs.


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