Abstract
Hierarchical heterostructures of NiCo2O4@XMoO4 (X = Ni, Co) were developed as an electrode material for supercapacitor with improved pseudocapacitive performance. Within these hierarchical heterostructures, the mesoporous NiCo2O4 nanosheet arrays directly grown on the Ni foam can not only act as an excellent pseudocapacitive material but also serve as a hierarchical scaffold for growing NiMoO4 or CoMoO4 electroactive materials (nanosheets). The electrode made of NiCo2O4@NiMoO4 presented a highest areal capacitance of 3.74 F/cm2 at 2 mA/cm2, which was much higher than the electrodes made of NiCo2O4@CoMoO4 (2.452 F/cm2) and NiCo2O4 (0.456 F/cm2), respectively. Meanwhile, the NiCo2O4@NiMoO4 electrode exhibited good rate capability. It suggested the potential of the hierarchical heterostructures of NiCo2O4@CoMoO4 as an electrode material in supercapacitors.
Highlights
To meet the increasing requirement for portable electronics, hybrid electronic vehicles and other micro- and nanodevices, numerous studies have been carried out to develop many kinds of energy storage systems
In this work, the NiCo2O4@XMoO4 (X = Ni, Co) hierarchical heterostructures were successfully synthesized for electrode materials
Detailed morphology and microstructure of the NiCo2O4 nanosheets were investigated via the scanning electron microscopy (SEM) and transmission electron microscopy (TEM)
Summary
To meet the increasing requirement for portable electronics, hybrid electronic vehicles and other micro- and nanodevices, numerous studies have been carried out to develop many kinds of energy storage systems. As an important energy storage device, the widely studied supercapacitors, known as electrochemical capacitors, have been believed as a promising candidate due to their high specific power, long cycling life, fast charge and discharge rates, and reliable safety [1,2,3,4,5,6,7,8,9]. Though these supercapacitors demonstrated these distinctive advantages, as compared with the batteries and fuel cells, the relatively lower energy densities seriously block their large-scale practical application [4, 10].
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