In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

Nanoscale Research Letters

Pinky Sagar¹  Sumit Kumar Pandey¹  Anchal Srivastava¹  S. K. Srivastava¹  Gopal Krishna Gupta²  Amit Srivastava²  Jai Singh³  Monika Srivastava⁴  A. K. Singh⁵ 

[1] Department of Physics, Institute of Science, Banaras Hindu University, 221005, Varanasi, India;Department of Physics, TDPG College, VBS Purvanchal University, 222001, Jaunpur, India;Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya, 495009, Bilaspur, India;School of Materials Science and Technology, Indian Institute of Technology (BHU), 221005, Varanasi, India;School of Physical Sciences, Jawaharlal Nehru University, 110067, New Delhi, India;

关键词: Bio-waste material;    Supercapacitor;    Electrochemical double-layer capacitance;    Kusha grass;    Activated carbon;    Porosity;   

DOI  :  10.1186/s11671-021-03545-8

来源: Springer

【 摘 要 】

Herein, we demonstrate the fabrication of highly capacitive activated carbon (AC) using a bio-waste Kusha grass (Desmostachya bipinnata), by employing a chemical process followed by activation through KOH. The as-synthesized few-layered activated carbon has been confirmed through X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy techniques. The chemical environment of the as-prepared sample has been accessed through FTIR and UV–visible spectroscopy. The surface area and porosity of the as-synthesized material have been accessed through the Brunauer–Emmett–Teller method. All the electrochemical measurements have been performed through cyclic voltammetry and galvanometric charging/discharging (GCD) method, but primarily, we focus on GCD due to the accuracy of the technique. Moreover, the as-synthesized AC material shows a maximum specific capacitance as 218 F g−1 in the potential window ranging from − 0.35 to + 0.45 V. Also, the AC exhibits an excellent energy density of ~ 19.3 Wh kg−1 and power density of ~ 277.92 W kg−1, respectively, in the same operating potential window. It has also shown very good capacitance retention capability even after 5000th cycles. The fabricated supercapacitor shows a good energy density and power density, respectively, and good retention in capacitance at remarkably higher charging/discharging rates with excellent cycling stability. Henceforth, bio-waste Kusha grass-derived activated carbon (DP-AC) shows good promise and can be applied in supercapacitor applications due to its outstanding electrochemical properties. Herein, we envision that our results illustrate a simple and innovative approach to synthesize a bio-waste Kusha grass-derived activated carbon (DP-AC) as an emerging supercapacitor electrode material and widen its practical application in electrochemical energy storage fields.

【 授权许可】

CC BY