Self-assembled Cube-like Copper Oxide Derived from a Metal-Organic Framework as a High-Performance Electrochemical Supercapacitive Electrode Material.

ABSTRACT: Interest in pseudocapacitive materials, especially cuprous oxide, has grown owing to its various advantageous properties and application as electrode materials in the energy storage devices. The work presented here, a cubic Cu₂O framework was synthesized using a simple and one-step modified polyol-assisted (metal-organic framework) solvothermal method. The structural configuration was rationalized by systematically studying the effect of the reaction time on the morphology and growth of the Cu₂O. In addition, a range of microscopic and spectroscopic techniques was employed to further characterize the obtained cubic Cu₂O. The morphological effect on the electrochemical supercapacitive performance of the obtained cubic Cu₂O was also examined by cyclic-voltammetry (CV) and galvanostatic-charge-discharge (G-C-D) method. The obtained outcome shows that the cubic Cu₂O synthesized using a reaction time of 12?h (Cu₂O-12h; C_sp ~365 Fg^-1) exhibited superior capacitive performance as compared to the cubic Cu₂O synthesized at 8?h (Cu₂O-8h; C_sp ~151 Fg^-1) and 10?h (Cu₂O-10h; C_sp ~195 Fg^-1) at the current density of 0.75 Ag^-1. Furthermore, the Cu₂O-12h electrode exhibits energy density of 16.95?Wh/Kg at a power density of 235.4?W/Kg and higher power density of 2678.5?W/Kg at low current density. In particular, the cube-like Cu₂O-12h exhibited excellent capacitive performance and rate capability as compared to Cu₂O-8h and Cu₂O-10h, owing to its unique three-dimensional morphology, which facilitates the formation of various active sites for intercalation of the electrolyte during the electrochemical process. These results show the as-obtained Cu₂O could be a promising supercapacaitive electrode material for various applications.

SUBMITTER: Aljaafari A 

PROVIDER: S-EPMC6591407 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature