The rational design of novel electrode based on structural and compositional considerations is highly essential for achieving high-performance supercapacitors. Herein, we employ the reactive pulsed laser deposition (PLD) method to design and fabricate of NiO@MnO2 core/shell nanosheet array grown on flexible Ni foil substrate for pseudocapacitors. In the PLD process, the pulsed laser beam is focused on the rotating Mn/Ni target and then produces energetic atomic species with energy up to a few keV. These ablated species undergo collisions in a low-pressure O3 atmosphere, and Mn/Ni oxide molecules are formed in the expanding ablation beam. This hybrid array structure for the redox reaction has the following advantages: (i) the well-arrayed nanosheets provide large specific surface area as well as effective pathway for fast electron and ion transport; (ii) the hybrid nanosheets optimize each component for enhancing their supercapacitors performance. As a result, the NiO@MnO2 hybrid nanosheet arrays exhibit a high capacitance (336 F g-1 at 1  A g-1; >  204 F g-1 (MnO2) and 153 F g-1 (NiO) in the potential range -0.2�0.5 V) with good cycle performance (11% capacitance loss after 1000 cycles) and remarkable rate capability (66% capacitance retention at a very large current density of 20 A g-1).

Pulsed laser deposition ofNiO@MnO<sub>2</sub> core/shell nanosheet arrays for high-performance energy storage

245th National Meeting (2013)

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Pulsed laser deposition ofNiO@MnO2 core/shell nanosheet arrays for high-performance energy storage

Pulsed laser deposition ofNiO@MnO₂ core/shell nanosheet arrays for high-performance energy storage