Abstract:The two-dimensional (2D) transition metal dichalcogenide nanosheet-carbon composite is an attractive material for energy storage because of its high Faradaic activity, unique nanoconstruction and electronic properties. In this work, a facile one step preparation of a molybdenum disulfide (MoS2) nanosheet-graphene (MoS2/G) composite with the in situ reduction of graphene oxide is reported. The structure, morphology and composition of the pure MoS2 and composites were comparatively analyzed by various characteri… Show more
“…182 and 158 F g À1 at 1 A g À1 , respectively, which is in agreement with the result of the CV curves. GCD curve of GS-5 shows longer discharging time compared to charging time, the phenomenon is often observed in the MoS 2 -based electrode systems [6,24,40,53], the investigation on exact mechanism of such phenomenon is in progress. To further understand the excellent electrochemical performances of GS-5, the EIS measurements for samples of MoS 2 , 3DG and GS-5 are carried out (Fig.…”
“…182 and 158 F g À1 at 1 A g À1 , respectively, which is in agreement with the result of the CV curves. GCD curve of GS-5 shows longer discharging time compared to charging time, the phenomenon is often observed in the MoS 2 -based electrode systems [6,24,40,53], the investigation on exact mechanism of such phenomenon is in progress. To further understand the excellent electrochemical performances of GS-5, the EIS measurements for samples of MoS 2 , 3DG and GS-5 are carried out (Fig.…”
“…As shown in AFM image in Figure S1, the thickness of most obtained nanosheets is around 1 nm, which corresponding to the monolayer of MoS 2 . As compared with bulk materials in Figure b and most of the related reported, the obtained MoS 2 are well exfoliated into a monolayer or few‐layers nanosheets (Figure c). In addition, we also exfoliated the MoS 2 at room temperature and 40 °C.…”
Section: Resultsmentioning
confidence: 65%
“…[1][2][3] Flexible energy storage devices require flexible, lightweight, electrically conductive materials as active materials to allow storage and release of "particles" (such as lithium ions, hydrogen atoms or molecules, or charges). [4,5] Graphene and its related two-dimensional (2D) crystals and composites represent a number of key properties that meet emerging energy needs. [6][7][8][9][10][11][12][13] Flexibility, a large surface area, and chemical stability coupled with its excellent electrical conductivity and thermal conductivity can be effectively implemented and the ion battery and a capacitor charge storage and diffusion.…”
Octahedral metal phase molybdenum disulfide (1T-MoS 2 ) shows excellent capacitive behaviour by storing charge via double layers over individual two-dimensional (2D) layers and through Faradaic reactions on the Mo centre because of its multiple oxidation states. In this study, we fabricate a freestanding film based on large-scale 1T-MoS 2 nanosheets and use it as an electrode for a flexible supercapacitor without any additives. The resulting free-standing electrodes have a layered structure, hydrophilicity and high electrical conduc-tivity, which are beneficial for electrolyte accessibility and fast ions transport. The specific volumetric capacitance of this pure 1T-MoS 2 -based electrode is up to 407.
“…Thanks to the hierarchical porous architecture, the specific surface area of Ni 3 Si 2 O 5 (OH) 4 /RGO and bare Ni 3 Si 2 O 5 (OH) 4 microspheres is as high as 67.6 and 61.6 m 2 g –1 , respectively. It is assumed that the larger specific surface area of Ni 3 Si 2 O 5 (OH) 4 /RGO microspheres would increase the contact area between the electrolyte and electrode material, facilitate the mass transport of charged ions, and provide more reactive sites during electrochemical reactions and thus bring about preferable supercapacitive performance [4, 28, 29]. Fig.…”
Nickel silicate hydroxide/reduced graphene oxide (Ni3Si2O5(OH)4/RGO) composite hollow microspheres were one-pot hydrothermally synthesized by employing graphene oxide (GO)-wrapped SiO2 microspheres as the template and silicon source, which were prepared through sonication-assisted interfacial self-assembly of tiny GO sheets on positively charged SiO2 substrate microspheres. The composition, morphology, structure, and phase of Ni3Si2O5(OH)4/RGO microspheres as well as their electrochemical properties were carefully studied. It was found that Ni3Si2O5(OH)4/RGO microspheres featured distinct hierarchical porous morphology with hollow architecture and a large specific surface area as high as 67.6 m2 g–1. When utilized as a supercapacitor electrode material, Ni3Si2O5(OH)4/RGO hollow microspheres released a maximum specific capacitance of 178.9 F g−1 at the current density of 1 A g−1, which was much higher than that of the contrastive bare Ni3Si2O5(OH)4 hollow microspheres and bare RGO material developed in this work, displaying enhanced supercapacitive behavior. Impressively, the Ni3Si2O5(OH)4/RGO microsphere electrode exhibited outstanding rate capability and long-term cycling stability and durability with 97.6% retention of the initial capacitance after continuous charging/discharging for up to 5000 cycles at the current density of 6 A g−1, which is superior or comparable to that of most of other reported nickel-based electrode materials, hence showing promising application potential in the energy storage area.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-017-2094-9) contains supplementary material, which is available to authorized users.
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