New enantiornithine bird from the uppermost Cretaceous (Maastrichtian) of southern Patagonia, Argentina

摘要

The efficient hybrid materials with high specific capacity and long stability are highly desirable electrode mate-rials for supercapacitors. Herein, composites based on ZnO/NiO as active electrode materials was fabricated using soft-templated hydrothermal method. The NiO and ZnO were successfully synthesize into 3D flower structures. The as-synthesized ZnO and NiO were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical measurements of the fabricated ZnO/NiO electrodes were carried out by series of cyclic voltammetry (CV), galvanostatic charge-dis-charge (GCD) and electrochemical impedance spectroscopy (EIS). The highest specific capacity of 350 C g-1 was found at 2 A g-1 current while the lowest specific capacity of 217 C g-1 was measured at 20 A g-1. Finally, the 3D flower-shaped ZnO/NiO electrode revealed cyclic stability of 72.1 % capacitance retention and 97.1 % Coulombic efficiency at the end of 8000 GCD cycles. The current study revealed augmented super-capacitor properties with exceptional cyclic stability of ZnO/NiO composite-based electrodes.

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