Hexagonal VS₂ Anchored MWCNTs: First Approach to Design Flexible Solid-State Symmetric Supercapacitor Device

Abstract

Transition metal chalcogenides (TMCs) embedded with a carbon network are gaining much attention because of their high power capability, which can be easily integrated to portable electronic devices. Facile chemical route has been explored to synthesize hexagonal structured VS nanoparticles onto multiwalled carbon nanotubes (MWCNTs) matrix. Such surface-modified VS/MWCNTs electrode has boosted the electrochemical performance to reach high capacitance to 830 F/g and excellent stability to 95.9% over 10 000 cycles. Designed flexible solid-state symmetric supercapacitor device (FSSD) with a wide voltage window of 1.6 V exhibited maximum gain in specific capacitance value of 182 F/g at scan rate of 2 mV/s along with specific energy of 42 Wh/kg and a superb stability of 93.2% over 5000 cycles. As a practical approach, FSSD has lightened up "VNIT" panel consisting of 21 red LEDs.

Novel chemical route for CeO2/MWCNTs composite towards highly bendable solid-state supercapacitor device

“…The significant G′ (2D) peak (2691 cm −1 ) is observed due to phonon scattering in MWCNTs; indication of a dense uniform distribution of MWCNTs in the sample 14 . The peak intensities of D and G bands for CeO 2 /MWCNTs are enhanced as compared to bare MWCNTs due to the surface enhanced Raman scattering (SERS) effect associated with the CeO 2 nanoparticles, which affect the local electromagnetic field 15 . The relative intensity ratio shows the information about graphitic and disordered carbon.…”

Emerging Layered Metallic Vanadium Disulfide for Rechargeable Metal‐Ion Batteries: Progress and Opportunities

“…[60,84] In later studies, flowerlike, leaflike, and layer-by-layer-like VS 2 NSs with differentt hicknesses, as well as VS 2 quantum dots (Figure 3), were directly synthesized through ah ydrothermal method with Na 3 VO 4 •12 H 2 O/Na 3 VO 4 [43,48,49,52,54,60,62,70,71,82,[84][85][86][87][88][89][90][91] or NH 4 VO 3 [37,40,42,58,59,73,76,86,[92][93][94][95][96][97][98][99] as the Vs ource and thioacetamide (TAA) or N-acetyl-l-cysteine as the Ss ource (reductant). Meanwhile,V S 2 /graphene, [42,100] Na 2 Ti 2 O 5 /VS 2 , [101] VS 2 /carbon paper, [51] TiO 2 -B@VS 2 , [102] rGO/VS 2 [44,75] ( Figure 4), VOOH/VS 2 , [103] VS 2 / MWCNTs, [46,…”

“…These characteristics endow VS 2 with abundant metal-ion storage sites (high theoreticalc apacity) and al ow ion diffusion barrier( fast reaction kinetics). [34,35] Apart from practical applications in LIBs, [36] SIBs, [37] KIBs, [38] MIBs, [39] ZIBs, [40] CIBs, [41] AIBs, [42] supercapacitors (SCs), [43] lithium-sulfur/selenium batteries (LiÀ S/Se), [44,45] and solid-state SC/lithium batteries, [46,47] VS 2 has also been used in aw ide variety of applications, such as electrocatalytic hydrogen evolution, [48][49][50][51] photoelectrochemicalw ater oxidation, [52] solar-drivenh ydrogen evolution, [53] solar cells, [54] magnetism/ferromagnetism, [55,56] spintronics, [57] humidity sensors and electrochemical biosensors, [58][59][60] touchless positioning interfaces, [61] field emitters, [62] cancert heranostics, [63] and cytotoxicity. [64] Nevertheless, only af ew specialized reviewsr elated to VS 2 have been reported in the literature (especially in the energy-storage field) and these mainly focus on the general progresso fm etal dichalcogenides.…”

The role of carbon nanotubes in enhanced charge storage performance of VSe2: experimental and theoretical insight from DFT simulations

“…The faradaic and non-faradaic components are given in eqn (1) and (2) respectively. 37 VSe 2 + K + + e À # VSe À SeK…”