Construction of NiCoS@NiMo-LDH hierarchical composite for high-performance supercapacitors

Ni(OH)2.0.75H2O nanosheets embedded with NiMoO4 nanoparticles (NiMo-LDH) supported by nickel cobalt sulfur (NiCoS) nanorods were prepared by a multi-step hydrothermal method, which provides an effective channel for ion transport and abundant active sites for charge storage. The NiCoS@NiMo-LDH electrode exhibited a very high capacitance of 1302.5 mu Ah cm-2 at 10 mA cm-2, with 54 % capacitance retention observed at 50 mA cm-2. The asymmetric supercapacitor (ASC) assembled with the NiCoS@NiMo-LDH as the positive electrode and active carbon (AC) as the negative electrodes which exhibits an energy density of 1096.6 mu Wh cm-2 at a power density of 2.8 mW cm-2 along with good stability of 86.67 % after 5000 cycles.

Automated summary

NiCoS@NiMo-LDH electrode composed of Ni(OH)2.0.75H2O nanosheets embedded with NiMoO4 nanoparticles was prepared. It exhibited high capacitance and retention, along with good stability in an asymmetric supercapacitor with AC as negative electrodes. The ASC showed a high energy density and good stability after 5000 cycles.