Mesoporous CuO–NiO micropolyhedrons: facile synthesis, morphological evolution and pseudocapcitive performance

Abstract

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 micropolyhedron-based supercapacitor was attributed to the unique mesoporous structure and a rational composition of the CuO/NiO constituents.