Nickel molybdate (NiMoO 4 ) is a typical pseudocapacitance material with high specific capacity. However, its inherent shortcomings of poor electrical conductivity and unstable structure caused by hindered migration of electrons and local aggregation of charges/ions seriously affect its energy-storage performance. Herein, using NiMoO 4 nanorods as the nucleation matrix, a hydrothermal approach was used to fabricate NiMoO 4 /NiCo-layered double hydroxide (LDH) nanocomposites. The NiCo-LDH nanosheets uniformly grown on NiMoO 4 nanorods not only provided a facile electron transfer channel and abundant redox active sites but also its interwoven nanosheet shell can retard the volume change and result in irreversible dissolution of the NiMoO 4 core during the charge/discharge process. Therefore, the NiMoO 4 /NiCo-LDH nanocomposite possesses a high specific capacity (153.7 mAh g –1 at 1 A g –1 ) and enhanced cyclic stability. Furthermore, the NiMoO 4 /NiCo-LDH nanocomposite is utilized as a positive electrode of an asymmetric supercapacitor (ASC). The NiMoO 4 /NiCo-LDH//activated horsetall tree-based carbon (AHTC) ASC achieves a high energy density of 40.3 Wh kg –1 at 425.5 W kg –1, as well as excellent cycle performance. The synergistic effect of nanocomposites between the various metal compounds with integrated architectures provides unique insights into the development of nanocomposites for energy-storage devices.
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Cui et al. (2022) studied this question.