Abstract
Herein, for the first time, the growth of ZnO nanorods directly on aluminum (Al) substrate via a low temperature (80 °C) wet chemical method, and used as binder-free electrode for supercapacitors were reported. XRD pattern and HRTEM images showed that high crystalline nanorods grown on Al substrate with c-axis orientation. Morphological studies revealed that the nanorods possessed well defined hexagon phase with length and diameter of ~2 µm and 100–180 nm, respectively. Raman spectrum of ZnO nanorods showed that the characteristic E2H mode corresponds to the vibration associated with the oxygen atoms of ZnO. The optical properties of ZnO nanorods studied using Room-temperature PL spectra revealed a near-band-edge (NBE) peak at ~388 nm emission and deep level (DLE) at ~507 nm. Electrochemical measurements showed that ZnO nanorods on Al substrate exhibited remarkably enhanced performance as electrode for supercapacitors with a value of specific capacitance of 394 F g−1 measured with scan rate of 20 mV s−1. This unique nanorods structures also exhibited excellent stability of >98% capacitance retention for 1000 cycles that were measured at 1A g−1. The presented easy and cost-effective method might open up the possibility for the mass production of binder-free electrodes for efficient electrochemical energy storage devices.
Highlights
In recent years, among the different energy storage systems, supercapacitors have gained the significant interest of researchers and scientific community due to their superior power density, longer life cycle, and cost effective maintenance as compared with the batteries/fuel cells, while it showed better energy density than conventional capacitors [1,2]
We have demonstrated, for the very first time, a facile and versatile strategy for the growth of Zinc oxide (ZnO) nanorods vertically on Al substrate by using low temperature (80 ◦C) wet chemical method for asymmetrical supercapacitors containing a binder-free electrode
ZnO nanorods on Al substrate as electrode for supercapacitors have been successfully grown at low temperature of 80 ◦C while using a facile wet chemical route with excellent electrochemical performance
Summary
Among the different energy storage systems, supercapacitors have gained the significant interest of researchers and scientific community due to their superior power density, longer life cycle, and cost effective maintenance as compared with the batteries/fuel cells, while it showed better energy density than conventional capacitors [1,2]. We have demonstrated, for the very first time, a facile and versatile strategy for the growth of ZnO nanorods vertically on Al substrate by using low temperature (80 ◦C) wet chemical method for asymmetrical supercapacitors containing a binder-free electrode.
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