Recent progress and applications of niobium-based nanomaterials and their composites for supercapacitors and hybrid ion capacitors

Abstract

Niobium (Nb)-based materials show great potential in the field of supercapacitors (SCs) and hybrid ion capacitors (HICs) because of their unique crystal structure, rapid ion diffusion ability, excellent chemical durability,...

Optimized Lithography-Free Fabrication of Sub-100 nm Nb2O5 Nanotube Films as Negative Supercapacitor Electrodes: Tuned Oxygen Vacancies and Cationic Intercalation

“…25 However, facile and simpler methods to fabricate T-Nb 2 O 5 are needed rather than the common surfactantassisted hydrothermal method. 20 To this end, electrochemical anodization has a myriad of favorable characteristics such as speediness, simplicity, and the possibility of materials nanostructuring at ambient temperature. 17,28 In addition, it is a practical and sustainable approach that can be deployed on a large scale.…”

“…29−31 Therefore, the fabrication of thin (sub-100 nm), defective, one-dimensional (1D) metal oxide films is expected to facilitate ion diffusion and resist the mechanical degradation of the electrodes. 20 However, these structures are usually fabricated using lithography techniques, which are expensive and require special processing in a cleanroom environment with the need to design special masks. These requirements make it less accessible in a plethora of labs.…”

“…Niobium oxides have been recognized as effective functional materials in solar cells and photocatalysis. − Recently, niobium oxides have shown great promise as positive electrode materials for battery and SC applications. − Yet, few studies have reported their performance as negative electrodes. Specifically, niobium pentoxide (Nb 2 O 5 ) is the most common oxide with favored electrochemical properties. , Interestingly, it has a quite complex structure and exhibits many polymorphisms; about 15 polymorphic arrangements of Nb 2 O 5 have been reported so far .…”

Hierarchical nickel–cobalt sulfide/niobium pentoxide decorated green carbon spheres toward efficient energy storage

“…11,12 As a direct consequence of the high oxygen affinity of Nb, its dominant form is niobium pentoxide (Nb 2 O 5 ). 12,13 Ultra-fast Li-ion intercalation and de-intercalation with no crystalline phase change parallel to high chemical stability and non-toxicity make Nb 2 O 5 a promising active material for energy storage applications. [12][13][14] Despite all bene-ts, the low electrical conductivity ($3 Â 10 À6 S cm À1 ) of Nb 2 O 5 has been a drawback, which has restricted its full potential for application in energy storage systems.…”

“…12,13 Ultra-fast Li-ion intercalation and de-intercalation with no crystalline phase change parallel to high chemical stability and non-toxicity make Nb 2 O 5 a promising active material for energy storage applications. [12][13][14] Despite all bene-ts, the low electrical conductivity ($3 Â 10 À6 S cm À1 ) of Nb 2 O 5 has been a drawback, which has restricted its full potential for application in energy storage systems. 15,16 Incorporation of transition metal compounds beneting from good electrical conductivity and high theoretical capacity/capacitance into the Nb 2 O 5 structure seems to be a promising strategy to enhance the conductivity of Nb-based active materials.…”