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An effective magnetic-field-assisted hydrothermal synthesis was used to induce the growth of 2 x 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. [ABSTRACT FROM AUTHOR]

Porous urchin-like MnCo2O4.5 hierarchical architectures (~4-6 μm in diameter) synthesized by a facile hydrothermal route followed by a calcination process exhibited a specific capacitance of 151.2 F g-1 at 5 mV s-1, outstanding rate capability with 83.6% specific capacitance retention even when the current density is increased 50 times and excellent long-term cycle stability at progressively varied current densities and could be considered as a potential mixed transition metal oxide material for high-rate supercapacitors in some special applications that do not require a high capacitance. [ABSTRACT FROM AUTHOR]