1. Laser Scribed Graphene from Oil Palm Lignin for Supercapacitor Applications
- Author
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Narasimhaa Naidu Loganathan, Kabilashen Readdyi Munusamy, Veeradasan Perumal, and Bothi Raja Pandian
- Subjects
reduced graphene oxide ,electric double layer capacitor ,laser lithography ,graphene electrode ,biopolymer ,Environmental engineering ,TA170-171 - Abstract
This paper reports a facile carbonization method of a biopolymer to synthesize reduced graphene oxide with excellent electrochemical properties for use as a supercapacitor electrode. Oil palm lignin is used as the biopolymer-based graphene precursor, and a carbon dioxide laser is used to carbonize the material via lithography. Using Raman Spectroscopy, the characterization of the resultant graphene (OP-LSG) revealed D, G, and 2D peaks corresponding to multilayer graphene. Scanning Electron Microscopy of OP-LSG revealed three-dimensional particle-like fibrous and porous nanostructures with an enhanced surface area. In a three-electrode setup in ferrocyanide electrolyte, cyclic voltammetry showed the electrode coated with OP-LSG achieving a specific capacitance as high as 108.044 mF/cm² at a scan rate of 0.01 V/s. The galvanostatic charge-discharge of OP-LSG revealed energy and power density values of 15 µWh/cm² and 597 µW/cm² at a scan rate of 0.01 V/s. The OP-LSG electrode retained 97.5% of its initial capacitance after 1000 charge-discharge cycles.
- Published
- 2021
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