Fibrous Network of C@MoS₂ Nanocapsule‐Decorated Cotton Linters Interconnected by Bacterial Cellulose for Lithium‐ and Sodium‐Ion Batteries

Abstract

To protect the structure of MoS2 from collapse, a strong skeleton is expected to help maintain the integrity. In this study, cotton linters burdened with hollow C@MoS2 nanocapsules are added into nutrient medium for the growth of a bacterial cellulose membrane. Benefitting from good conductivity and structural integrity, the resultant fibrous membrane anode gives reversible capacities of 559 and 155 mAh g−1 for Li‐ion batteries and Na‐ion batteries after 100 cycles, respectively. The structural transformation and component evolution in lithiation–delithiation and sodiation–desodiation was elucidated by in situ Raman spectroscopy. After sodiation, the Na2S did not transform back into MoS2 but was more likely converted into elemental sulfur during the conversion reaction. Layered semiconducting transition metal chalcogenides, such as molybdenum disulfide (MoS2), feature open 2 D ion‐transport channels amenable to receive various guest ions with high theoretical capacities.[2] One serious challenge curtailing the applicability of such materials is their volume changes during discharge–charge processes.[3, 4] However, particular morphologies of MoS2 are proposed to improve the specific capacity.[5,6,7] Many works have focused on core–shell and hollow MoS2 micro‐ and nanostructures, and the results validate the advantages of shortening the lithium‐ion diffusion distance and enhancing specific capacity.[8,9] Unfortunately, the issue of inferior capacity stability is not resolved, because the structure is not effectively protected and is prone to collapse.

Core–Shell Co, Zn Bimetallic Selenide Embedded Nitrogen-Doped Carbon Polyhedral Frameworks Assist in Sodium-Ion Battery Ultralong Cycle

“…In the figure, R s is the ohmic contact resistance of the electrolyte, R ct is to the charge transfer resistance, and R f appears after the first cycle to represent the SEI resistance. 50,51 The fitting results are listed in Table S2. It is apparent that the ZnSe@CoSe 2 /NC composite has the smallest impedance value, indicating that the electrode has good electrical conductivity.…”

“…As shown in Figure g, the EIS curves can be divided into two parts, which are composed of a semicircle of a medium–high-frequency region and a straight line of a low-frequency region, and the curve can be fitted by a corresponding equivalent circuit (Figure S4g). In the figure, R s is the ohmic contact resistance of the electrolyte, R ct is to the charge transfer resistance, and R f appears after the first cycle to represent the SEI resistance. , The fitting results are listed in Table S2. It is apparent that the ZnSe@CoSe 2 /NC composite has the smallest impedance value, indicating that the electrode has good electrical conductivity .…”

Nanocellulose‐Based Functional Materials: From Chiral Photonics to Soft Actuator and Energy Storage

“…The Fe 3 O 4 -BC-CNF electrodes exhibited high flexibility while concomitantly improving the electrochemical performance of the bare BC-CNFs and Fe 3 O 4 NPs (Figure 19d). Zhou et al [312] reported a biological strategy that significantly improved the integrity of the film by introducing cotton linters during the growth of BC (Figure 19e). When compared with BC/glucose (BG)-C@MoS 2 nanofibers without substrate protection and support, the BG-C@MoS 2 composites had an intact fibrous structure that sustained large volume expansion and shrinkage (Figure 19f).…”

“…e) Fabrication process of BG-C@MoS 2 electrodes and f) the corresponding cross-sectional SEM images. Reproduced with permission [312]. Copyright 2019, Wiley-VCH.…”

Hybrids based on borate-functionalized cellulose nanofibers and noble-metal nanoparticles as sustainable catalysts for environmental applications

“…Efforts have been directed toward the use of much smaller constituents such as nanobers (NFs) and nanocrystals for cutting-edge applications because of their remarkable properties including high specic surface area, low density, excellent mechanical properties, thermal stability, low cost, biocompatibility, and biodegradability. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Cellulose nanobers (CNFs) are long exible nano-bers with widths of 5-50 nm and lengths in the micron-tosubmicron scale (50-3000 nm). 18 Selective oxidation of the hydroxyl groups to carboxylate groups on the surface of each crystalline cellulose bril, mediated by 2,2,6,6tetramethylpiperidine-1-oxyl (TEMPO) and subsequent mechanical treatment allows the formation of CNFs with increased capacity to immobilize catalytic metal species.…”