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Molybdenum Disulfide (MoS2) and Its Nanocomposites as High-Performance Electrode Material for Supercapacitors

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Metal and Metal Oxides for Energy and Electronics

Abstract

Supercapacitor is a promising energy storage device, which has many advantages including long service lifetime, great power density, fast charge-discharge processes, and green environmental protection. The properties and performance of supercapacitors are greatly dependent on the electrode materials; hence the selection of the electrode material is crucial. There are many metal oxides which have been reported for supercapacitors and ultracapacitors; however, its performance is not that as expected. Thus high-performance electrode materials with large surface area and specific capacitance have been a topic of interest for the development of high-performance supercapacitors. Recently, two-dimensional (2D) transition metal dichalcogenides having layered structures, such as MoS2, VS2, SnS2, CoS2, and WS2, have received significant attention because they offer good energy density, power density, and cycling stability. Among them, the layered molybdenum disulfide (MoS2) is considered to have great potential for its applications as supercapacitors. MoS2 nanosheet is composed of one Mo atomic layer sandwiched between two S layers by covalent bonding, and with these triple layers stacked together to form a layered structure, is expected to act as an excellent energy storage material. It is because of the 2D electron–electron correlations among Mo atoms which would aid in enhancing planar electric transportation properties. MoS2 nanosheets can deliver excellent pseudocapacitance because of the Mo ions having oxidation states ranging from +2 to +6, which enable them to be used as high-performance electrode materials in supercapacitors. Indeed, as a graphene analogue, MoS2 nanosheets exhibit unique physical, optical, and electrical properties correlated with its 2D ultra-thin atomic layer structure and high surface area, making it very interesting for its use as electrodes in high-performance supercapacitors and also a promising supporting material to stabilize metal nanoparticles (NPs), forming hierarchical composites. The specific capacitance of MoS2 is still very limited in alone for energy storage applications. The combination of MoS2 and other conducting materials such as graphene, carbon nanotubes (CNTs), or ceramic nanomaterials such a zirconium (Zr) may overcome these deficiencies. This chapter gives a clear picture of the applications of MoS2 as high-performance electrode in supercapacitors.

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Abbreviations

MoS2:

Molybdenum disulfide

NaBH4:

Sodium borohydride

NaOH:

Sodium hydroxide

H3PO4:

Phosphoric acid

RuO2:

Ruthenium(IV) oxide

MnO2:

Manganese(IV) oxide

Co3O4:

Cobalt(II,III) oxide

NiCo2O4:

Nickel cobalt oxide

TiO2:

Titanium dioxide

WS2:

Tungsten disulfide

Na2SO4:

Sodium sulfate

Ni3S2:

Nickel subsulfide

KCl:

Potassium chloride

ZrO2:

Zirconium dioxide

MoO2:

Molybdenum dioxide

MoO3:

Molybdenum trioxide

1T Phase:

Trigonal phase of MoS2

2T Phase:

Tetragonal phase of MoS2

2H Phase:

Hexagonal phase of MoS2

3R Phase:

Rhombohedral phase of MoS2

DFT:

Density functional theory

EDLC:

Electrical double-layer capacitance

ESD:

Electrostatic spray deposition technique

FESEM:

Fourier transform scanning electron microscopy

GO:

Graphene oxide

HGS:

Hollow graphene sphere

ITA:

Indium tin oxide

LBL:

Layer by layer

MWCNT:

Multiwalled carbon nanotubes

NMP:

N-methyl-2-pyrrolidone

PET:

Polyethylene terephthalate

PVA:

Polyvinyl alcohol

rGO:

Reduced graphene oxide

SWCNT:

Single-walled carbon nanotubes

TEM:

Transmission electron microscopy

TMB:

3,3′,5,5′-tetramethylbenzidine

TMD:

Transition metal dichalcogenides

XRD:

X-ray diffraction technique

Fcm−3:

Faraday per centimeter cube

μWhcm−2:

Microwatt hour per centimeter square

Fcm−3:

Farad per centimeter cube

mVs−1:

Millivolt per second

mAcm−2:

Milliampere per centimeter square

Fg−1:

Farad per gram

Ag−1:

Ampere per gram

KWkg−1:

Kilowatt per kilogram

mFcm−2:

Millifarad per centimeter square

mScm−1:

Millisiemens per centimeter

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Acknowledgments

The authors, Dr. Jabeen Fatima M. J and Dr. Prasanth Raghavan, would like to acknowledge Kerala State Council for Science, Technology and Environment (KSCSTE), Kerala, for financial assistance.

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Correspondence to Jabeen Fatima M. J. or Raghavan Prasanth .

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Das, A. et al. (2021). Molybdenum Disulfide (MoS2) and Its Nanocomposites as High-Performance Electrode Material for Supercapacitors. In: Rajendran, S., Qin, J., Gracia, F., Lichtfouse, E. (eds) Metal and Metal Oxides for Energy and Electronics. Environmental Chemistry for a Sustainable World, vol 55. Springer, Cham. https://doi.org/10.1007/978-3-030-53065-5_2

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