Sponge-like nanoporous activated carbon from corn husk as a sustainable and highly stable supercapacitor electrode for energy storage
Por:
Lobato-Peralta, Diego Ramon, Duque-Brito, Estefania, Orugba, Henry O., Arias, D. M., Cuentas-Gallegos, Ana Karina, Okolie, Jude A., Okoye, Patrick U.
Publicada:
1 ene 2023
Resumen:
Corn husk, an abundant agro-industrial waste was employed to produce activated carbon for energy storage. The sponge-like activated carbons were produced with environmentally friendly potassium carbonate (K2CO3) at different impregnation ratio (corn husk:K2CO3; 1:1 to 1:3) and activation temperatures (500–800 °C). The obtained activated carbon was used to produce electrodes for supercapacitor application. The results revealed that corn husk: K2CO3 ratio of 1:2 and 650 °C promoted mainly nanopores (0.773 nm) with appreciably higher specific surface area (1115 m2/g) and a sponge morphology. The electrochemistry performance test on the materials shows specific capacitances of up to 269 F/g at 5 mV/s scan rate for a material obtained at 650 °C. The textural characteristics, morphology, and heteroatoms of sulfur and nitrogen significantly promoted higher energy storage capacity. This activated carbon was employed to assemble a symmetric supercapacitor in acidic electrolyte (0.5 M H2SO4) that delivered up to ~10 Wh/kg and was very stable, maintaining about 99.5 % of its original energy after 20,000 charge/discharge cycles. © 2023 Elsevier B.V.
Filiaciones:
Instituto de Energías Renovables (IER-UNAM), Privada Xochicalco s/n Col. Centro, Morelos, Temixco, 62580, Mexico
Department of Chemical Engineering, Delta State University, Abraka, Nigeria
Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Km. 107 Carretera Tijuana-Ensenada, B.C., Ensenada, C.P. 22800, Mexico
Gallogly College of Engineering, University of Oklahoma, Norman, OK 73019, United States
Inst Energias Renovables IER UNAM, Privada Xochicalco S-N Col Ctr, Temixco 62580, Morelos, Mexico
Delta State Univ, Dept Chem Engn, Abraka, Nigeria
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana, Ensenada 22800, BC, Mexico
Univ Oklahoma, Gallogly Coll Engn, Norman, OK 73019 USA
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