Rare Earth-Doped MoS₂ for Supercapacitor Application

Abstract

The low availability of fossil fuels, high expenditure, and serious environmental impacts are the key to sustainable clean and green energy development. Molybdenum-based electrode materials are identified as effective electrodes to improve energy storage devices' performances. In this work, pure and different rare earth (neodymium and gadolinium) doped MoS 2 electrodes are successfully prepared by employing the hydrothermal method. Doping rare earth elements with metal sulfides would be beneficial for combining with functional groups due to the 4f vacant orbital. Macroscopic analysis exposed the morphological variations from sphere to sheet by the effect of doping. The sheet-like Gd-doped MoS 2 nanostructures exhibited the maximum 357 F/g@10 mV/s specific capacitance from CV and 231.38 F/g@1 A/g from GCD with a prolonged cycling life of 81.50% over 5000 cycles. EIS spectra revealed the lowest solution and charge transfer resistance for Gd-doped MoS 2 materials, which suggests the high conductivity of the material. The strategies and results outlined in this paper are expected to trigger the search for completely new rare earth-doped metal sulfides for efficient energy storage applications.

Promising Rare-Earth-Doped, Electrospun, ZnO Nanofiber N-type Semiconductor for Betavoltaic Batteries

“…Rare-earth (RE) elements, including the 15 lanthanides (La–Lu) and 2 group IIIB elements (Sc and Y), have a special 4f-5d electron ground state . RE elements have a large atomic radius and a weak binding ability of the nucleus for the outer layer of electrons, so the electrons can transition between multiple energy levels and have strong chemical activity. , Doping RE elements into ZnO nanofibers is a promising method for material modification. − Doping nanomaterials with RE ions can adjust the crystal phase, conductivity, bandgap, and electronic configuration of the nanomaterials to endow them with rich optical, electrical, magnetic, and catalytic properties. − For instance, Ji et al. reported incorporation of RE ions (Tb, Dy, and Er) into ZnO nanostructures, observing dramatic splitting and enhancement of the intra-4f transition in photoluminescence excitation spectra .…”

Flower-like manganese and phosphorus co-doped MoS2with high 1T phase content as a supercapacitor electrode material

“…in the MoS 2 layer can ameliorate the specific capacitance because of the improved electrochemical activity and abundant redox reactions originating from metallic heteroatoms. [12][13][14][15][16] Sun et al 17 fabricated Co-doped MoS 2 nanosheets, which achieved a capacity of 510 F g À1 at 1 A g À1 . Singha et al 18 prepared Mn incorporated MoS 2 nanoflowers using manganese chloride as a dopant, and appropriately Mn doped MoS 2 nanoflowers exhibited a maximum capacity of 430 F g À1 .…”

Robust MOF-on-MOF heterostructures as efficient cathode candidates for next-generation supercapacitors

“…Various materials, such as 2D materials 20 (MXene, 21–23 MoS 2 , 24,25 reduced graphene oxide, 26,27 etc. ), porous materials (coordination polymer, 28,29 metal–organic frameworks (MOFs), 30–33 covalent organic frameworks, 34–36 etc.…”

“…16,17 There are other reports on the application of pseudocapacitive materials like vanadium oxide and tungsten oxide in high-voltage supercapacitors. 18,19 Various materials, such as 2D materials 20 (MXene, 21-23 MoS 2 , 24,25 reduced graphene oxide, 26,27 etc. ), porous materials (coordination polymer, 28,29 metal-organic frameworks (MOFs), [30][31][32][33] covalent organic frameworks, [34][35][36] etc.…”