Search

Mesoporous NiO single-crystalline nanosheet arrays grown on Ni foam with a thickness of about 5 μm have been fabricated by a facile hydrothermal approach and further investigated as a binder-free electrode for high-performance supercapacitors. Owing to the high conductivity of the single-crystalline NiO nanosheet arrays on the conducting substrate in combination with the large surface area provided by the mesoporous NiO nanosheets, the unique designed NiO nanosheet arrays on Ni foam have exhibited a high specific capacitance (674.2 F g-1 at a current density of 1 A g-1), good rate capability, and excellent cycling stability (93.5% capacitance retention after 5000 cycles). These results suggest that the singlecrystalline NiO nanosheet array electrode is a promising candidate for high-performance supercapacitors and the rational design of this unique binder-free electrode demonstrated in this work provides a new and facile approach to fabricate other transition metal oxide arrays for electrochemical energy storage. [ABSTRACT FROM AUTHOR]

Mesoporous CuO-NiO micropolyhedrons were fabricated via a facile, environmentally friendly, and scalable synthetic route for high-performance supercapacitors. The morphology and structure of CuO-NiO composites can be well tailored by tuning the molar ratio of Cu to Ni and processing temperature. The CuO-NiO micropolyhedrons were used as an electrode in a supercapacitor. The specific capacitance in a three electrode system was 370 F g-1 at a current density of 2 mA cm-2 with good capacitance retention of 84% after 500 cycles, which outperforms other CuO nanostructure-based supercapacitors. The remarkable performance of the resultant mesoporous CuO-NiO micropolyhedronbased supercapacitor was attributed to the unique mesoporous structure and a rational composition of the CuO/NiO constituents. [ABSTRACT FROM AUTHOR]