Mesoporous NiO nanoarchitectures for electrochemical energy storage: influence of size, porosity, and morphology

Abstract

The development of flexible, sustainable, and efficient energy storage has recently attracted considerable attention to satisfy the demand for huge energy and power density and meet future societal and environmental needs. Consequently, numerous studies have focused on the design/development of nanomaterials based on mesoporous architectures to improve energy and power densities. We explored how nanoarchitectures in term of morphology, particle size, surface area, and pore size/distribution define energy and power performance. The large-scale production, low-cost manufacturing, and highperformance of supercapacitors based on the microwave-assisted synthesis of mesoporous nickel oxide nanocrystals (NCs) were presented. Mesoporous NiO in various morphologies including nanoslices (NSs) and nanoplatelets (NPLs), were synthesized. The superior electrochemical performance of mesoporous NiO NPLs is related to their unique morphology, size, and pore size distribution, which enhance the diffusion of hydroxide ions through mesoporous networks, i.e. "superhighways". These characteristics induce the high capacitance and excellent recyclability of NiO NPLs more than NiO NSs. Moreover, the microwave-assisted synthesis enhanced charge storage and stability compared with those prepared through the hydrothermal approach. This approach demonstrates the potential of free-standing NiO NPL electrodes for developing high-performance pseudocapacitors.

Synthesis and characterization of silica nanostructures for cotton leaf worm control

“…Therefore, several of mesoporous metal oxide nanoparticles have been recently synthesized with controlled compositions, structures, and morphologies due to their composition-, structure-, and morphology-dependent properties and applications [16][17][18]. Among various metal oxides, mesoporous silica nanostructures were extensively studied for their scientific and technological interests including separations, catalysis, sensing, and drug delivery [19][20][21][22].…”

Self-assembly of porous copper oxide hierarchical nanostructures for selective determinations of glucose and ascorbic acid

“…Interestingly, it was noted that, the copper-ion precursors were effectively controlling the self-assembly of CuO nanoparticles within the hierarchical structures. The induced-water hydrolysis of [Cu(NH 3 ) 4 2 converted to monoclinic CuO due to oxolation process at a relatively higher temperature without a trace of the subsequent annealing treatment in air (eqn (3)). Hence, the copper ions source can modify the subsequent precipitation process, which might affect the competition between thermodynamics and kinetics during the transformation of precursors, nucleation, growth and assembly of CuO nanostructures (see the following equations).…”

Hydrothermal synthesis of hierarchical mesoporous NiO nanourchins and their supercapacitor application

“…However, the actual pseudocapacitance performance of Nickel oxide is still relatively low due to the poor electrical conductivities as well as small specific surface area [18]. It is believed that the morphology and structure play an important role in enhancing the electrochemical performance of NiO [13,16]. Considerable research have demonstrated that nanosized and porous NiO can provide large active surface area for reaction and effective contact between the electrode and electrolyte, which are the key points to enhance the electrochemical performance [19].…”

“…As a significant p-type semiconductor, NiO has recently attracted considerable attentions in various application fields [12], such as lithium ion batteries [13], fuel cell electrodes [11], gas sensors [14], catalysts [15] and supercapacitors [16]. Among the investigated supercapacitor materials, NiO has attracted enormous interests owing to its high theoretical capacity (2573 F g À 1 ), low cost and good pseudocapacitive performance [13,16].…”

“…Among the investigated supercapacitor materials, NiO has attracted enormous interests owing to its high theoretical capacity (2573 F g À 1 ), low cost and good pseudocapacitive performance [13,16]. Until now, nanostructured NiO materials with various structures and morphologies have been synthesized to improve the electrochemical performance of NiO, such as hollow nanosphere [11], nanowire [14], nanotube [17], nanoflower [2,6], nanoarray [9], etc.…”