Erman Taer, - and Eva Wahyuni Harahap, - and Apriwandi, - and Rika Taslim, - (2022) High-performance aqueous electrolyte symmetrical supercapacitor using porous carbon derived cassava peel waste. Applied Materials and Technology, 4. ISSN e-2686-0961, P-2721-446X

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Abstract

Electrolytes have generally recognized as one of the most important components in enhancing the electrochemical performance of supercapacitors. On the other hand, aqueous electrolytes considered prime candidates for the development of the next generation of symmetric supercapacitors due to their low-cost, environmentally friendly, high ionic conductivity, ne ionic size, and high capacitance. Herein, the symmetrical supercapacitor of the sustainable porous carbon-based electrode material was con rmed through various aqueous electrolytes consisting of neutral, basic, and acidic such as Na2SO4, KOH, and H2SO4. Activated carbon obtained from high potential biomass sources of cassava peel waste. Activated carbon synthesis was performed with a comprehensive approach in order to obtain abundant pore structure, high porosity, and improved we ability through a combination of high-temperature chemical and physical activation. In addition, the electrode material is designed to resemble a solid disc without the addition of a synthetic binder. e evaluation of the disc dimensions showed high porosity in the obtained activated carbon. Furthermore, the symmetrical supercapacitor of the optimized electrode material exhibited excellent speci c capacitances of 112, 150, and 183 F g-1 at 1 mV s-1 in the electrolytes Na2SO4, KOH, and H2SO4, respectively. In addition, the highest rate capability of 70% was con rmed in the H2SO4 acid electrolyte. Moreover, their coulombic efficiency can be maintained around 89% with low equivalent series resistance 0.21-0.42 Ω. erefore, the activated carbon-based supercapacitor symmetric cell device from cassava peel showed high performance for developing high- performance supercapacitor applications with guaranteed stability in aqueous electrolytes.

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