Review—MoSe₂ Nanostructures and Related Electrodes for Advanced Supercapacitor Developments

Abstract

Molybdenum diselenide (MoSe2), an in-organic analog of graphene, is considered a rising star in the family of transition-metal dichalcogenides (TMDs) because of its stable covalent Mo–Se bond, good catalytic properties, huge specific surface area, higher electrical, multivalent oxidation states of transition metal ions, and its ability to be intercalated with suitably-sized metal atoms or organic molecules to modify their physical properties with a distinguishing layered structure. It is being projected as the next-generation 2D layered nano-material for many energy storage-conversion applications. This review covers the properties, functionalization of MoSe2, and their applications in supercapacitors, discussing the current developments of MoSe2 and its nano-composites-based supercapacitors, providing emphasis to the capacitive performances which comprise of specific capacitance/ capacity, cyclic lifespan, energy density, power density, rate capability, and their practicality in the real environments. Fundamental charge-storage mechanisms are also discussed to provide better insight into how MoSe2 is ascribed to each supercapacitor. Wherever applicable, limitations of the existing approaches and future outlook are also described.

Nanostructured molybdenum dichalcogenides: a review

“…In the first step, hydrazine hydrate reduced selenium to give selenium ions as per eqn (10). When this solution was added to a solution of sodium molybdate in water, excess hydrazine hydrate reduced Mo 6+ ions in Na 2 MoO 4 to Mo 4+ ions (eqn (11)). Finally, the product was formed as per eqn (12) where the reaction between molybdenum and selenium ions took place in an autoclave.…”

“…Several reports and reviews were published discussing various applications of Mo-chalcogenides and a few of them are referred in this article. 168,169 Mo-dichalcogenides have been proposed as potential materials for energy applications such as thermoelectrics, 170 Li/Na-ion batteries, 10 supercapacitors, 11 etc. Due to the high ionic conductivity and surface area, they are potential materials for electrical double layers in supercapacitors.…”

“…Mo–dichalcogenides have been proposed as potential materials for energy applications such as thermoelectrics, 170 Li/Na-ion batteries, 10 supercapacitors, 11 etc. Due to the high ionic conductivity and surface area, they are potential materials for electrical double layers in supercapacitors.…”

“…The common synthesis methods include exfoliation, chemical vapour deposition, hydrothermal and solvothermal approaches. Because of their multi-dimensional structural properties, MoX 2 have applications in advanced technologies such as in hydrogen evolution reactions, [5][6][7] light-emitting diodes, 8 solar cells, 9 Li/Na-ion batteries, 10 supercapacitors, 11 field-effect transistors, 12,13 photo-detectors, 14 bio-sensors, [15][16][17] solid lubricants, dehydrosulfurization, 10 photocatalysis, 18 desalination of water 19,20 and the biomedical field. 21 Therefore, studying these materials allows us to go beyond graphene and explore new properties of 2D inorganic materials.…”

Topological transformation construction of a CoSe2/N-doped carbon heterojunction with a three-dimensional porous structure for high-performance sodium-ion half/full batteries

“…As electrode materials, transition metal selenides (TMSs) with unique properties have been rapidly developed in the fields of secondary batteries, such as supercapacitors, fuel cells and solar cells. [13][14][15] Besides this, TMSs also play an important role in anode electrode materials for SIBs. TMSs can be divided into those with a layered structure (MoSe 2 , TiSe 2 , etc.)…”