Solubility‐Parameter‐Guided Solvent Selection to Initiate Ostwald Ripening for Interior Space‐Tunable Structures with Architecture‐Dependent Electrochemical Performance

Abstract

Despite significant advancement in preparing various hollow structures by Ostwald ripening, one common problem is the intractable uncontrollability of initiating Ostwald ripening due to the complexity of the reaction processes. Here, a new strategy on Hansen solubility parameter (HSP)-guided solvent selection to initiate Ostwald ripening is proposed. Based on this comprehensive principle for solvent optimization, N,N-dimethylformamide (DMF) was screened out, achieving accurate synthesis of interior space-tunable MoSe spherical structures (solid, core-shell, yolk-shell and hollow spheres). The resultant MoSe structures exhibit architecture-dependent electrochemical performances towards hydrogen evolution reaction and sodium-ion batteries. This pre-solvent selection strategy can effectively provide researchers great possibility in efficiently synthesizing various hollow structures. This work paves a new pathway for deeply understanding Ostwald ripening.

Molybdenum and tungsten chalcogenides for lithium/sodium-ion batteries: Beyond MoS2

“…12 f and g). The enhanced performance is attributed to the synergistic effects including enhanced electrical conductivity by increasing crystallinity, more electrochemical active sites due to higher specific surface area, and fast mass transfer kinetics with enlargement of interior space [204] . Similarly, Zhang et al prepared a rod-like hollow structure composed of interlayer-expanded MoSe 2 nanosheets with a 54.8% expansion of (002) planes up to 10.0 Å .…”

“…The combined structural features are beneficial for the fast Na + ion and electron kinetics and excellent performances thereof [199] . On the other hand, some S-doped 2H-MoSe 2 porous nanospheres assembled from few-layered nanosheets also showed enhanced electrical conductivity, expanded layer spacing, and improved Na-ion storage performance thereof [176,200,204] .…”

Hollow‐Structured Electrode Materials: Self‐Templated Synthesis and Their Potential in Secondary Batteries

“…For example, Cao et al developed an efficient synthesis strategy for the creation of hollow MoSe 2 nanomaterials. [22] In view of the fact that solvent played a critical role in the dissolution and redisposition of the initially formed species, the authors focused on the design of the solvents, thereby to modulate the growth process in solution towards a precise control of the hollow architectures ( Figure 1). The authors resorted to the a semiempirical correlation know as Hansen solubility parameter (HSP) for the guidance on dissolution behavior, and identified 1methyl-2-pyrrolidinone (NMP) as a favorable solvent which showed suitable dissolving capacity on MoSe 2 species, thereby modulating the Ostwald ripening process to achieve a good control on the interior spaces of the prepared hollow structures.…”

“…a) FESEM image, b-e) TEM images, f) EDX spectrum, g) XRD pattern, and h) Raman spectrum of MoSe 2 HSs. [22] Reproduced with permission. Copyright 2018, Wiley-VCH.…”

Ultra-small Fe3O4 nanodots encapsulated in layered carbon nanosheets with fast kinetics for lithium/potassium-ion battery anodes

“…[1][2][3][4][5] However, the gap between limited element reserves and vast demands for Li resources is getting larger because of the large-scale application of LIBs. [6][7][8][9] Therefore, the development of an alternative energy storage system is quite urgent. 10 Potassium ion batteries (KIBs) have attracted wide interest due to even distribution, low cost, and similar electrochemical behaviors.…”