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Aqueous Zn-ion batteries (ZIBs) are considered very promising alternatives to lithium-ion batteries. However, the low reversibility and slow diffusion of zinc ions in the positive electrode limit their commercial applications. Herein, we successfully prepared the metallic 1T phase of MoS2 (1T-MoS2) with a nano interlayer spacing of 1.025 nm through...
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... the relatively small size should help shorten the Zn 2+ diffusion length, so it can promote electrochemical reactions. In order to study the effect of different sizes of MoS 2 specic surface area on the performance, we conducted a N 2 adsorption test. The adsorption isotherms and pore size distributions of the three MoS 2 samples are shown in Fig. 3. According to the national standard (GB/19587-2017), MoS 2 at different temperatures showed similar type III adsorption isotherms. The results showed that the adsorption of MoS 2 belongs to multi-layer adsorption, which is consistent with the microsphere structure assembled from nanosheets in the SEM image. The data in Table S1 † show ...
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... adsorption isotherms. The results showed that the adsorption of MoS 2 belongs to multi-layer adsorption, which is consistent with the microsphere structure assembled from nanosheets in the SEM image. The data in Table S1 † show that the prepared MoS 2 has a small specic surface area, but according to the pore volume-pore size distribution curve (Fig. S3 †), it can be seen that 200-MoS 2 has the most uniform mesoporous structure, indicating that it is benecial to contact with the electrolyte. The high-resolution TEM (HRTEM) image clearly shows that the MoS 2 nanosheets on the 200-MoS 2 (Fig. 4b) surface arrange uniformly and resemble a spherical shape, while the 180/220-MoS 2 (Fig. 4a ...
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Citations
... 133 Modification of Zn metal electrodes using MoS 2 looks promising in enhancing the performance of Zn electrode-based batteries. [134][135][136] Similar studies have demonstrated the outstanding performance of graphene composites toward dendrite suppression. [137][138][139][140][141] Two studies systematically evaluating the role of graphene and MoS 2 in Zinc dendrite suppression are discussed here in detail. ...
To offset the intermittent nature, renewable energy sources must be paired with energy storage systems (ESS) to cater to the demand for clean energy solutions. The performance characteristics requirements of these ESS are application‐specific, say batteries are characterized by their high energy capacity while supercapacitors offer greater power density. Currently, the research concentration in this domain is on improving the performance parameters of proven energy storage chemistries. Two‐dimensional (2D) materials characterized by high specific surface area, and tunable physical and electrical properties are explored extensively to enhance ESS performance. This review comprehends the progress made by two typical 2D materials, Graphene and Molybdenum disulfide, to enhance the energy/ power capacity, and life span of a few chosen rechargeable storage chemistries, lithium‐ion, lithium‐sulfur batteries, supercapacitors, and flow batteries. Further the review presents the current state of ESS, the challenges identified so far which restrict their capacity and life span, and the solutions employed to date. Finally, the challenges associated with these solutions are critically analyzed to suggest future directions and research perspectives in this domain.
... The contact impedance between the electrode interface and electrolyte decreased with a smaller radius. 79,80 Because the SEI formation could not be differentiated from the charge transfer, it was fitted with CPE dl and R CT elements in parallel. The low-frequency stage of the Nyquist plots showed a sloping line or long tail fitted with a Warburg element to reflect the solid-state diffusion. ...
... Functionalizing graphene platelets [34] or other conductive hosts, such as oriented or random carbon nanotubes [35,36], with groups that have high adsorption energy towards sulfides, such as single-atom catalysts [34,[36][37][38][39][40] or amines [41], may not have the intended results if the cathode host materials have large mesopores or macropores where the adsorption energy falls as the distance of the sulfide ion increases from the pore wall [42]. As a result, 1T-MoS2-based MXenes still seem a very attractive cathode host due to their long-range lamellar structure with interlayer distances of the order of 1 nm [43,44]. ...
... Before this most recent development [63], MxMoS2 was proposed as an electrode for monovalent [64,65] or multivalent metal (M)-ion batteries [43,66], on its own [43,[64][65][66] or in the form of carbon or graphene or rGO hybrids [67,68]. The first question has been, of course, the intercalation of metal ions which, in this case, concerns Li + ions in the MoS2 structure. ...
... Before this most recent development [63], MxMoS2 was proposed as an electrode for monovalent [64,65] or multivalent metal (M)-ion batteries [43,66], on its own [43,[64][65][66] or in the form of carbon or graphene or rGO hybrids [67,68]. The first question has been, of course, the intercalation of metal ions which, in this case, concerns Li + ions in the MoS2 structure. ...
The aim of this study is to investigate new materials that can be employed as cathode hosts in Li-S batteries, which would be able to overcome the effect of the shuttling of soluble polysulfides and maximize the battery capacity and energy density. Density functional theory (DFT) simulations are used to determine the adsorption energy of lithium sulfides in two types of cathode hosts: lithiated 1T-MoS2 (1T-LixMoS2) and hybrid 1T-LixMoS2/graphene. Initial simulations of lithiated 1T-MoS2 structures led to the selection of an optimized 1T-Li0.75MoS2 structure, which was utilized for the formation of an optimized 1T-Li0.75MoS2 bilayer and a hybrid 1T-Li0.75MoS2/graphene bilayer structure. It was found that all sulfides exhibited super-high adsorption energies in the interlayer inside the 1T-Li0.75MoS2 bilayer and very good adsorption energy values in the interlayer inside the hybrid 1T-Li0.75MoS2/graphene bilayer. The placement of sulfides outside each type of bilayer, over the 1T-Li0.75MoS2 surface, yielded good adsorption energies in the range of −2 to −3.8 eV, which are higher than those over a 1T-MoS2 substrate.
... This possibly implies electron transfer from Mo 2 C to MoS 2 . The S 2p orbital is represented by a characteristic peak at 226.6 eV binding energy [31]. These observations collectively demonstrate the effective binding of Mo 2 C and MoS 2 , resulting in a robust interface interaction. ...
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... Moreover, flexible quasi-solid-state ZIBs with MoS 2 /graphene cathodes exhibit good stability under different bending conditions. Cai et al. prepared a flowerlike 1 T-MoS 2 material with a substantial interlayer spacing of 1.025 nm through a one-step hydrothermal method and used it as a cathode for ZIBs [57]. By altering the hydrothermal temperature, the crystallinity of 1 T-MoS 2 can be significantly modified, thus enhancing the zinc storage capacity of MoS 2 as a ZIB cathode. ...
... On the other hand, the reduction of hydrothermal temperature can widen the layer spacing of MoS 2 , resulting in the reduced volume expansion of MoS 2 during the lithium-ion insertion process [18,19]. Cai et al [20] briefly attributed the increase of MoS 2 layer spacing to the incomplete vulcanization at low hydrothermal temperature without further investigation. Moreover, the result of transmission electron microscopy (TEM) showed that there are obvious structural defects in the MoS 2 synthesized at low temperature [20]. ...
... Cai et al [20] briefly attributed the increase of MoS 2 layer spacing to the incomplete vulcanization at low hydrothermal temperature without further investigation. Moreover, the result of transmission electron microscopy (TEM) showed that there are obvious structural defects in the MoS 2 synthesized at low temperature [20]. Jia et al [11] also found that the Mo atoms were enriched at the edge of MoS 2 nanocrystals synthesized by the hydrothermal method at 160°C. ...
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... The pseudocapacitance effect is slowly dominant, indicating that the surface reaction is faster than the internal diffusion reaction, which accelerates the intercalation and extraction of Zn 2+ in the material. Moreover, the diffusion characteristics of P-MoS 2 are more obvious, which can be attributed to the marigold-shaped structure and wide layer spacing [59]. The impedance of P-MoS 2 and pristine MoS 2 is evaluated by EIS, as shown in Figure 6f. ...
Structural unsteadiness and sluggish diffusion of divalent zinc cations in cathodes during cycling severely limit further applications of MoS2 for rechargeable aqueous zinc-ion batteries (ZIBs). To circumvent these hurdles, herein, phosphorus (P) atom embedded three-dimensional marigold-shaped 1T MoS2 structures combined with the design of S vacancies (Sv) are synthesized via the oxygen-assisted solvent heat method. The oxygen-assisted method is utilized to aid the P-embedding into the MoS2 crystal, which can expand the interlayer spacing of P-MoS2 and strengthen Zn2+ intercalation/deintercalation. Meanwhile, the three-dimensional marigold-shaped structure with 1T phase retains the internal free space, can adapt to the volume change during charge and discharge, and improve the overall conductivity. Moreover, Sv is not only conducive to the formation of rich active sites to diffuse electrons and Zn2+ but also improves the storage capacity of Zn2+. The electrochemical results show that P-MoS2 can reach a high specific capacity of 249 mAh g−1 at 0.1 A g−1. The capacity remains at 102 mAh g−1 after 3260 cycles at a current of 0.5 A g−1, showing excellent electrochemical performance for Zn2+ ion storage. This research provides a more efficient method of P atom embedded MoS2-based electrodes and will heighten our comprehension of developing cathodes for the ZIBs.
... The result showed that the ammonia promoted hydrolysis of thioacetamide to provide reduced S 2and generated a large amount of NH 4 + as intercalating particles. These particles expanded the layer spacing of pristine MoS 2 from 0.62 nm to 0.92 nm, greatly reducing the Zn 2+ inserting energy barrier (with its charge transfer resistance of MoS 2 -N only 35 Ω), and increased the discharge specific capacity to 149.9 mAh·g −1 at the current density of 0. [13][14][15] , 通过在 MoS 2 层状结构之间嵌入客体粒子, 实现层间距扩展, 降 低 Zn 2+ 的插层位垒; 2)复合相结构 [16][17][18][19] , 通过引入 导电金属 1T 相, 促进离子/电子快速传导; 3)化学修 饰 [20][21][22][23] , 通过引入空位或者杂元素改变材料电子结 构; 4)与导电材料复合 [24][25][26] [37] 。b 可以通过 lgi 和 lgv 之间的斜率来计算。如 ...
