Magnetic-field-assisted hydrothermal synthesis of 2 × 2 tunnels of MnO2 nanostructures with enhanced supercapacitor performance

Abstract

An effective magnetic-field-assisted hydrothermal synthesis was used to induce the growth of 2 × 2 tunnel MnO₂ nanostructures for supercapacitor application. The as-fabricated electrode from the MnO₂ nanostructures exhibited an enhanced specific capacitance of 306 F g⁻¹ at 0.5 A g⁻¹ and desirable cyclic stability, which considerably exceed the performance of MnO₂ material prepared with and without a high magnetic field, making it a promising electrode material for supercapacitors.