Few-layered MoSe₂ nanosheets as an advanced electrode material for supercapacitors

Abstract

We report the synthesis of few-layered MoSe2 nanosheets using a facile hydrothermal method and their electrochemical charge storage behavior. A systematic study of the structure and morphology of the as-synthesized MoSe2 nanosheets was performed. The downward peak shift in the Raman spectrum and the high-resolution transmission electron microscopy images confirmed the formation of few-layered nanosheets. The electrochemical energy-storage behavior of MoSe2 nanosheets was also investigated for supercapacitor applications in a symmetric cell configuration. The MoSe2 nanosheet electrode exhibited a maximum specific capacitance of 198.9 F g(-1) and the symmetric device showed 49.7 F g(-1) at a scan rate of 2 mV s(-1). A capacitance retention of approximately 75% was observed even after 10 000 cycles at a high charge-discharge current density of 5 A g(-1). The two-dimensional MoSe2 nanosheets exhibited a high specific capacitance and good cyclic stability, which makes it a promising electrode material for supercapacitor applications.

Hierarchical MoS2 microspheres prepared through a zinc ion-assisted hydrothermal route as an electrochemical supercapacitor electrode

“…This mechanism can be termed as intercalation pseudocapacitance. 18,19 24,25 Additionally, the reduction of active surfaces originating from the overlapping or restacking of MoS 2 nanosheets as well as structural instability during repeated ions insertion/extraction can also lead to an unsatised electrochemical performances.…”

CoNi2S4‐Graphene‐2D‐MoSe2 as an Advanced Electrode Material for Supercapacitors

“…[11] MoSe 2 nanosheets are rarely studied to be applied as active materials for SCs since they easily agglomerated because of high specific area. [12] Theoretically, combining MoSe 2 with conductive matrix, such as graphene, is a feasible way to improve the rate capability and cycle performance of electrodes, owing to its superior electrical conductivity and large surface area. [13] However, despite the obtained promising results, the MoSe 2 nanosheets incline to agglomerate and separate from graphene sheets because of their poor interfacial properties if they are simply mixed, thus greatly limiting the capacitive performance.…”

Hydrothermal assisted in situ growth of CoSe onto graphene nanosheets as a nanohybrid positive electrode for asymmetric supercapacitors

“…15 TMCs can be denoted as AB x (where A is any metal ions of group IV, V and VI transition elements, B is a chalcogen S, Se and Te, and x represents the multivalent oxidation state) and also provides a very unique physical and chemical properties, which have diverse application in catalysis, phototransistors, DSSC, sensors, wastewater treatment, electronic devices and electrochemical energy storage systems. [16][17][18][19][20] In this study, the cobalt selenide have been chosen as a typical TMCs because transition metal cobalt (Co) exhibits a variable oxidation state and moreover the cobalt based compounds such as Co 3 O 4 , CoS, CoS 2 , Co 3 S 4 and Co 1Àx S x , have been investigated widely for high performance supercapacitors due to their excellent intrinsic properties and excellent electrochemical properties. Se has a lower electronegativity with larger ionic radius compared with the other chalcogenides (e.g.…”