Nghiên cứu sử dụng chitosan từ vỏ tôm làm chất điện ly cho siêu tụ điện

Abstract

     Supercapacitors are potential energy storage devices due to their fast charging, large discharging time, safety and environmental friendly. In this study, a nanocomposite of graphene and NiCo₂O₄ with a high porosity was sythezied by a microwave-assisted method and used for supecapacitor electrodes. The morphology, size, physic-chemical properties of prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-rays deffractions (XRD), X-rays photoelectron spectroscopy (XPS). Interestingly, chitosan from shrimp shells was used as a solid electrolyte for supercapacitor. Results show that the nanocomposite has a high porosity and NiCo₂O₄ nanoparticles have a size of 30-50 nm and distributed evenly on the graphene sheets. The supercapacitors that were prepared by using graphene/NiCo₂O₄ nanocomposites showed a significant improvement of energy capacity in compared to pure graphene or bare NiCo₂O₄. In addition, chitosan electrolyte also shows much higher energy capacity than that of Nafi on electrolyte. Moreover, the prepared supercapacitor with chitosan electrolyte showed excellent stability with over 96% after 2000 cycles.

Keywords: Chitosan, shrimp shells, supercapacitors, nanomaterials, energy storage