Synthesis of the urea-formaldehyde resin@MnO۲ core-shellnanoparticles and investigation of their performance in supercapacitors.

Energy has been one of the important issues considered by the world powers and researchers,and many efforts has been made to invent and develop for energy storage. Capacitors as one of thestorage devices has a high power density and high energy, and play a great role in the world needs.The main aim of the present research has been the preparation of the core-shell nanoparticles ofthe manganese dioxide and manganese disulfide with melamine-formaldehyde rsin shell assupercapacitor material. As the first step, the nanoparticles of urea formaldehyde resin wereprepared and covered by the MnO۲ and MnS۲. The morphology and chemical structure of thesamples has been investigated and confirmed by FT-IR, DLS, XRD and SEM techniques. Theelectrode prepared by using of the synthesized core-shell nanoparticles and carbon nanopowdersuch as Volkan were studied via cyclic voltammetry, charge-decharge technique, galvanostaticand electrochemical impedance spectroscopy. According to the results, the specific capacitiesobtained for the electrodes prepared by using of MnO۲, UF@MnO۲, MnS۲ and UF@MnS۲ asactive electrode materials have been ۳۵۸, ۲۷۹, ۴۲۸ and ۱۰۵ F.g-۱. Electrochemical impedancespectrospy studies has indicated an almost ideal capacitive behviour for these electrodes. Also, arelatively ideal charge-decharge capacitive behavior has been observed for these electrodes.

کلیدواژه ها:

Supercapacitor ، urea-formaldhyde resin ، active carbon ، specific capacity ، cycliccharge-discharge