Facile synthesis of core-shell FeOOH@MnO2 nanomaterials with excellent cycling stability for supercapacitor electrodes

Core-shell nanoparticles have much potential and exciting application in the supercapacitors field. The construction of unique core-shell nanostructures plays an important role in the efficient enhancement of the rate capacity and the stability of this material. The core-shell structure of the FeOOH@MnO2 synthesis procedures involves two main steps. Firstly, the spindle FeOOH was received by the hydrolysis of Fe3+. Then, Manganese sulfate monohydrate reacted with Potassium permanganate and forms Manganese dioxide crystal nucleus, which gradually grew into manganese dioxide nanosheets on the surface of FeOOH and finally obtain core-shell FeOOH@MnO2. The as-prepared FeOOH@MnO2 nanomaterials were used as capacitive materials and showed an excellent capacitance.