Hierarchical shell/core electrodes with CuO nanowires based on carbon cloths for high performance asymmetric supercapacitors

Transition metal oxides/hydroxides are important pseudocapacitive materials for supercapacitors, however, low electron transfer capability and poor long-term cycle stability limit their applications. Constructing transition metal oxide/hydroxide nanoarrays on conducting collectors is an effective way to solve the above problems. In this thesis, CuO nanowires based on carbon cloths (CuO-CCs) were firstly grown by chemical copper plating and thermal oxidation, and then Ni(OH)(2)@CuO-CCs and Fe2O3@CuO-CCs were constructed by chemical bath deposition and hydrothermal methods, respectively. The ASC device using Ni(OH)(2)@CuO-CCs as positive electrodes and Fe2O3@CuO-CCs as negative electrodes were assembled. The results demonstrate that the optimal specific capacities of Ni(OH)(2)@CuO-CCs and Fe2O3@CuO-CCs are 2.282 F cm(-2) (at 1 mA cm(-2)) and 0.772 F cm(-2) (at 2.5 mA cm(-2)), respectively. The ASC device reaches the energy density of 81.12 Wh kg(-1) at a power density of 2.88 kW kg(-1), and exhibit the capacitance maintenance of 97.9% after 10,000 cycles.

Automated summary

This study focuses on improving the charge transfer capability and cycle stability of transition metal oxides/hydroxides by constructing nanoarrays on conducting collectors. By assembling Ni(OH)(2)@CuO-CCs as positive electrodes and Fe2O3@CuO-CCs as negative electrodes in an ASC device, it achieves high specific capacities and energy density with excellent capacitance maintenance after cycles.