Preparation of ZnCo2O4 nanowire arrays with high capacitive by a one-step low-temperature water bath and calcination methods

In this paper, ZnCo2O4 nanowire arrays (NWAs) were successfully prepared on carbon cloth (CC) conductive substrates using a water bath method followed by calcination treatment. The as-prepared ZnCo2O4 NWAs were uniformly grown on the conductive substrates and their length was about 10 um. Cyclic voltammetry, charge-discharge, and the other electrochemical testing methods were used to research the electrochemical performance of the ZnCo2O4 NWAs. The results indicate that the product had a good specific capacity and cyclic stability. When the current density is 1 A g(-1), the specific capacity of the as-prepared ZnCo2O4 NWAs reaches 2300 F g(-1). The cycling stability of the ZnCo2O4 NWAs reaches 96.84% after 10,000 cycles at a current density of 5 A g(-1). In addition, we have assembled an asymmetric supercapacitor by using the material and activated carbon (AC) as positive and negative electrodes, respectively. The device has a maximum voltage window of 1.6 V and can operate in this voltage range class. The device has a good specific capacity (248 F g(-1) at 1 A g(-1)) and excellent capacity retention (97.42% after 10,000 cycles at 5 A g(-1)). The relevant experimental data show that it has a maximum energy density of 88.18 Wh kg(-1) (specific power of 800 W kg(-1)) and a maximum power density of 12,000 W kg(-1) (specific energy of 53.69 Wh kg(-1)). In this paper, ZnCo2O4 nanowire materials were prepared by water bath and calcination, which provided a strategy for preparing high-performance electrode materials.