Synthesis of Mesoporous ZnO Nanosheets via Facile Solvothermal Method as the Anode Materials for Lithium-ion Batteries

Abstract

Mesoporous ZnO nanosheets are synthesized through a room temperature solvothermal method. Transmission and scanning electronic microscopy observations indicate that as-prepared ZnO hierarchical aggregates are composed and assembled by nanosheets with a length of 1–2 μm and a thickness of 10–20 nm, and interlaced ZnO nanosheets irregularly stack together, forming a three-dimensional network. Furthermore, large mesopores are embedded in the walls of ZnO nanosheets, confirmed by Brunauer-Emmett-Teller (BET) measurement. Accordingly, the resulting ZnO anode exhibits a high and stable specific discharge capacity of 421 mAh g−1 after 100 cycles at 200 mA g−1 and a good rate capability. Such electrochemical performance could be attributed to the multiple synergistic effects of its mesoporous nanosheet structure, which can not only provide a large specific surface area for lithium storage, but also favor the ion transport and electrolyte diffusion.

Synthesis, Characterization, and Photocatalytic Tests of N-Doped Zinc Oxide: A New Interesting Photocatalyst

“…Samples produced through the stirring method (ZnO St and N-ZnO St) exhibited a surface area of less than 10 m 2 /g, while those synthetized through microwave assisted method (ZnO MW and N-ZnO MW) have a slightly higher area (11.5 ± 0.9 m 2 /g), underlining that the surface area is dependent on the synthetic method but is not affected by N-doping. The unexpected low surface area obtained with these synthetic processes was quite surprising, considering the quite high photoactivity of that samples, but higher than the commercial ZnO powder (4-5 m 2 /g) [41]. Figure 2 shows the absorption spectra (DRS UV-Vis) obtained for ZnO and N-doped ZnO samples.…”

A Drug-free, Self-destruction Strategy to Combat Bacterial Infections by Using the Intrinsically formed Magnetic Nanoparticles in Bacterial Pathogens

“…The crystalline peaks at 2θ = 31.73°, 36.2° and 56.6° represents (100), (101), (110) hkl plane correspond to the hexagonal crystal structure of ZnO according to JCPDS no. 36-1451 [32] . The peaks at 2θ = 18.3°, 30.1°, 35.2°, 43.1°, 53.3°, 56.7° and 62.4° with hkl plane of (111), (220), (311), (400), (422), (511) and (440) correspond to the cubic spinel structure of ZnFe 2 O 4 according to JCPDS no.79-1150 [29] .…”

Anodic ZnO-Graphene Composite Materials in Lithium Batteries

“…The said solvents can be alcohols, acids, bases, or mixtures, since, with this, a greater dissolution or changes in the pressures generated in the synthesis are sought [56]. With the solvothermal synthesis technique, authors such as Wi et al [19] and Wang et al [42] have obtained nanoparticle agglomerates, of spherical shape and porous sheet type, respectively. In the case of Wang et al [42], the synthesis process was carried out at room temperature reaching thicknesses of up to 10 nm in the sheets.…”

“…Within the synthesis methods, relatively complex methods are found such as the chemical vapor deposition (CVD) [30], Vapor Phase Transport (VPT) [31] for its acronym in English. These techniques are relatively expensive and complex, compared to others such as chemical precipitation [28,32], sol-gel [23,[33][34][35], hydrothermal [29,[36][37][38][39][40][41], or solvothermal [19,42,43].…”