NiMoO₄@Ni(OH)₂ core/shell nanorods supported on Ni foam for high-performance supercapacitors

Abstract

Electrodes with rationally designed hybrid nanostructures can offer many opportunities for the enhanced performance in electrochemical energy storage. In this work, we demonstrate the design and fabrication of NiMoO4@Ni(OH)2 core/shell nanorods on nickel foam via a facile hydrothermal and electrodeposition process for supercapacitor applications. The novel nanoscale morphology has been proven to be responsible for their excellent capacitive performances. Ni(OH)2 nanosheets were uniformly wrapped on the surface of each NiMoO4 nanowire, which increased the capacitance of NiMoO4@Ni(OH)2 core/shell nanorods to a high areal capacitance of 7.43 F cm -2 at 4 mA cm -2 . 72% of the initial capacity was retained after 1000 cycles at a current density of 8 mA cm -2 . These results indicate that the NiMoO4@Ni(OH)2 core/shell nanorods could be a promising electrode material for high-performance electrochemical capacitors.

Ni(OH)2@Ni core-shell nanochains as low-cost high-rate performance electrode for energy storage applications

“…Su et al . reported a similar Ni(OH) 2 @Ni core-shell obtained electrode with a higher specific capacity but lower rate capability 19 , while Jiang and co-workers obtained a specific capacity higher than Ni(OH) 2 theoretical limit by using a NiMoO 4 @Ni(OH) 2 core-shell electrode where both core and shell are active materials 35 . The good cycling stability of the Ni(OH) 2 @Ni core-shell nanochains can be further improved by using graphene nanosheets 15 or carbon nanotubes 31 .…”

Synthesis of a NiMoO4/3D-rGO Nanocomposite via Starch Medium Precipitation Method for Supercapacitor Performance

“…Mo is not involved in redox reactions. This element, with a high conductivity, can increase the whole capacity of the cell [26,44]. As shown in Figure 6b, the CV curves of the NiMoO 4 /3D-rGO electrode, similar to the NiMoO 4 electrode (Figure 6a), at low scan rates displayed two redox peaks related to NiMoO 4 faradaic reactions (Ni 2+ /Ni 3+ ).…”

NiCo2S4@NiMoO4 Core-Shell Heterostructure Nanotube Arrays Grown on Ni Foam as a Binder-Free Electrode Displayed High Electrochemical Performance with High Capacity

“…The NiCo 2 S 4 @NiMoO 4 /NF was prepared by a hydrothermal route combining with a calcination process were according to previously published works with some modified [ 32 , 35 ]. Typically, the NiCo 2 S 4 /NF was put into the 70 mL solution containing 1 mmol Ni(NO 3 ) 2 · 6H 2 O and 1 mmol Na 2 MoO 4 · 2H 2 O through a hydrothermal treatment under 100 °C for 4 h. Therein, the as-obtained sample was annealed by keeping the temperature at 400 °C for 2 h under Ar atmosphere.…”

“…Recently, various core-shell hybrid structure configurations have been fabricated such as NiCo 2 S 4 @Ni(OH) 2 [ 28 ], NiCo 2 S 4 @Co(OH) 2 [ 29 ], NiCo 2 O 4 @NiMoO 4 [ 30 ], Co 3 O 4 @NiMoO 4 [ 31 ], NiMoO 4 @Ni(OH) 2 [ 32 ] and so forth, which have improved the electrochemical performance. Despite this progress, it is still a big challenge to fabricate the core-shell heterostructure with well-defined morphologies by effective and simple methods [ 33 ].…”