Abstract
It is essential to develop new electrode materials for electrochemical energy storage to meet the increasing energy demands, reduce environmental pollution and develop low-carbon economy. In this work, binder-free NiCo2S4 nanorod arrays (NCS NRAs) on nickel foam electrodes are prepared by an easy and low energy-consuming route. The electrodes exhibit superior electrochemical properties both for alkaline and Li-ion batteries. In 3M KOH electrolyte, the NCS NRAs achieve a specific capacity of 240.5mAhg−1 at a current density of 0.2Ag−1, and 105.7mAhg−1 after 1500 cycles at the current density of 5Ag−1 with capacity retention of 87.3%. As the anode for LIBs, it shows a high initial capacity of 1760.7mAhg−1 at the current density of 100mAg−1, corresponding coulombic efficiency of 87.6%, and a rate capacity of 945mAhg−1 when the current density is improved 10 times. Hence, the NiCo2S4 nanorod arrays are promised as electrode materials with competitive performance.
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