Rational design of octahedron and nanowire CeO2@MnO2 core–shell heterostructures with outstanding rate capability for asymmetric supercapacitors

Abstract

Two kinds of novel CeO₂@MnO₂ nanostructures have been synthesized via a self-assembly strategy. The as-prepared CeO₂ nanowire@MnO₂ nanostructures exhibited unprecedented pseudocapacitance performance (255 F g⁻¹) with outstanding rate capability. A new mechanism based on the synergistic effect between CeO₂ and MnO₂ was proposed to interpret this phenomenon. When assembled as an asymmetric supercapacitor, an energy density of 27.5 W h kg⁻¹ with a maximum power density of 1.6 kW kg⁻¹ was achieved for CeO₂ nanowire@MnO₂ nanostructures.