Abstract
Hierarchical NiMoO4/NiMoO4 nanoflowers were fabricated on highly conductive flexible nickel foam (NF) substrates using a facile hydrothermal method to achieve rapid charge-discharge ability, high energy density, long cycling lifespan, and higher flexibility for high-performance supercapacitor electrode materials. The synthesized composite electrode material, NF/NiMoO4/NiMoO4 with a nanoball-like NF/NiMoO4 structure on a NiMoO4 surface over a NF substrate, formed a three-dimensional interconnected porous network for high-performance electrodes. The novel NF/NiMoO4/NiMoO4 nanoflowers not only enhanced the large surface area and increased the electrochemical activity, but also provided an enhanced rapid ion diffusion path and reduced the charge transfer resistance of the entire electrode effectively. The NF/NiMoO4/NiMoO4 composite exhibited significantly improved supercapacitor performance in terms of a sustained cycling life, high specific capacitance, rapid charge-discharge capability, high energy density, and good rate capability. Electrochemical analysis of the NF/NiMoO4/NiMoO4 nanoflowers fabricated on the NF substrate revealed ultra-high electrochemical performance with a high specific capacitance of 2121 F g−1 at 12 mA g−1 in a 3 M KOH electrolyte and 98.7% capacitance retention after 3000 cycles at 14 mA g−1. This performance was superior to the NF/NiMoO4 nanoball electrode (1672 F g−1 at 12 mA g−1 and capacitance retention 93.4% cycles). Most importantly, the SC (NF/NiMoO4/NiMoO4) device displayed a maximum energy density of 47.13 W h kg−1, which was significantly higher than that of NF/NiMoO4 (37.1 W h kg−1). Overall, the NF/NiMoO4/NiMoO4 composite is a suitable material for supercapacitor applications.
Highlights
In recent years, novel energy sources have become a major challenge for global sustainable development in the 21st century due to the exhaustion of fossil fuels and environmental pollution [1,2,3,4].The concerns regarding global warming caused by the use of non-renewable fossil fuels have increased considerably [5]
NF/NiMoO4 and NF/NiMoO4 /NiMoO4 nanostructures were prepared on a nickel foam substrate
NF/NiMoO4 and NF/NiMoO4/NiMoO4 nanostructures were prepared on a nickel foam substrate using a facile hydrothermal approach and evaluated as electrode materials for supercapacitor using a facile hydrothermal approach and evaluated as electrode materials for supercapacitor applications
Summary
Novel energy sources have become a major challenge for global sustainable development in the 21st century due to the exhaustion of fossil fuels and environmental pollution [1,2,3,4].The concerns regarding global warming caused by the use of non-renewable fossil fuels have increased considerably [5]. Serious efforts have been made to exploit renewable energy, such as biofuels, wind power, and tidal sources, with the intention of partially replacing fossil fuels [6,7,8]. In this regard, considering the various energy storage devices available, the most promising and fast emerging storage device is the supercapacitor (SC) owing to its high energy and power density, rapid. Energy storage in SCs takes place via two methods: electrochemical double layer capacitors (EDLCs) and pseudocapacitors (PCs or redox capacitors) [12,13]. PCs generally have a very high energy density and specific capacitance compared to EDLCs, owing to their excellent conductivity and electrochemical properties [15,16]
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