Hierarchical chestnut-like MnCo<sub>2</sub>O<sub>4</sub> nanoneedles grown on nickel foam as binder-free electrode for high energy density asymmetric supercapacitors

Hierarchical chestnut-like MnCo₂O₄ nanoneedles grown on nickel foam as binder-free electrode for high energy density asymmetric supercapacitors

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•: Hierarchical chestnut-like MnCo₂O₄ nanoneedles are grown on Ni foam.
•: MnCo₂O₄ nanoneedles are formed by numerous interconnected MnCo₂O₄ nanoparticles.
•: MnCo₂O₄ NNs electrode shows a specific capacitance of 1535 F g⁻¹ at 1 A g⁻¹.
•: MnCo₂O₄ NNs//G ASC delivers a high energy density of 60.4 Wh kg⁻¹.
•: MnCo₂O₄ NNs//G ASC shows excellent cycle stability at 30 A g⁻¹.