Facile hydrothermal synthesis and electrochemical supercapacitor performance of hierarchical coral-like ZnCo2O4 nanowires
Abstract This paper reports a facile hydrothermal synthesis of hierarchical coral-like ZnCo 2 O 4 nanostructures comprised of necklace type nanowires without the use surfactants. The hierarchical coral structure is composed of an interconnected necklace-type nanowire arrangement on the nanoscale, facilitating charge transportation. In addition, the coral-like ZnCo 2 O 4 nanowires were mesoporous (29.36m 2 g −1 and 18.96nm), leading to large electrochemical active sites for the redox reaction and fast ion transport within the ZnCo 2 O 4 nanowires. When used in electrochemical supercapacitors, the interconnected necklace type, coral-like ZnCo 2 O 4 nanowires exhibited a significantly high specific capacity (694Fg −1 at a current density of 2Ag −1 ), high rate capability (264Fg −1 at 10Ag −1 ), and excellent cycling stability (capacitance retention of ∼85% even after 2000cycles at a charge-discharge current density of 10Ag −1 ). These results suggest that hierarchical coral-like ZnCo 2 O 4 nanowires are a promising electrode material for energy storage applications in high-performance pseudocapacitors. Highlights Hierarchical coral-like ZnCo 2 O 4 nanowires were synthesized by facile hydrothermal method. The ZnCo 2 O 4 nanowires exhibited a large electrochemically active surface area of 29.36m 2 g −1 . Coral-like ZnCo 2 O 4 nanowires delivered a specific capacitance of 694Fg −1 at a current density of 2Ag −1 . Coral-like ZnCo 2 O 4 nanowires showed ∼85% capacitance retention after 2000cycles at a current density of 10Ag −1 . Graphical abstract [DISPLAY OMISSION]
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