1 research outputs found
Three-Dimensional Polypyrrole-Decorated CuCo<sub>2</sub>S<sub>4</sub> Nanowires Anchored on Nickel Foam: A Promising Electrode for High-Performance Supercapacitors
The
exploitation of high-performance supercapacitors
is crucial
to promote energy storage technologies. Benefiting from the three-dimensional
conductive micronanostructures and high specific capacity of the PPy@CuCo2S4@NF (polypyrrole/copper cobalt sulfide/nickel
foam) composite electrode, this electrode exhibits a high specific
capacity of 1403.21 C g–1 at 1 A g–1 and a capacitance retention of 85.79% after 10,000 cycles at 10
A g–1. The assembled PPy@CuCo2S4@NF//AC aqueous hybrid supercapacitor (AHSC) reveals a wide operating
potential window of 1.5 V and achieves a high specific capacity of
322.52 C g–1 at 1 A g–1 and a
capacitance retention of 86.84% after 15,000 cycles at 10 A g–1. The AHSC also exhibits a high power density of 733.69
W kg–1 at an energy density of 67.19 W h kg–1, surpassing those of previously reported spinel-based
supercapacitors. Ex situ X-ray diffraction and X-ray photoelectron
spectroscopy results show that the CuCo2S4 spinel
structure changes to CuS2 and CoS2 cube structures,
and the oxidation states of Cu and Co increase during charging and
discharging processes. Density functional theory calculations suggest
a superior conductivity for CuCo2S4 compared
to that for CuCo2O4, demonstrating that CuCo2S4 has superior electrochemical performance. These
findings attest to the considerable potential of the spinel materials
for advanced energy storage applications