Free‐Standing CoO‐POM Janus‐like Ultrathin Nanosheets

Abstract

A single-step solution-based strategy is used to obtain 2D Janus-like free-standing ultrathin nanosheets build from two structurally unrelated species, that is, polyoxomolybdate (POM) and CoO. A controlled 2D-to-1D morphological transition was achieved by judiciously adjusting the solvent choice. These POM-CoO heterostructures can behave as an ideal catalyst for the epoxidation of styrene. Benefiting from their amphiphilic nature, these 2D POM-CoO nanosheets have also been used as surfactant to emulsify immiscible solvents. It is anticipated that structurally diverse polyoxometalates will offer promise as design elements for variety of structurally and compositionally tunable van der Waals integrated heteromaterials having a broad range applications. Figure 1. a) PCNSs formation model. b) TEM, c) AFM, d) HRTEM and SAED pattern, e) elemental mapping through EDX, and f) XRD pattern of as-synthesized PCNSs. Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Single‐Unit‐Cell Catalysis of CO2 Electroreduction over Sub‐1 nm Cu9S5 Nanowires

“…[ 31 ] Additionally, Cu 9 S 5 SNWs display another characteristic peak of PW 12 O 38.5 with strong diffraction intensity, suggesting that H 3 [P(W 3 O 10 ) 4 ]· x H 2 O cluster can be successfully covalently linked to Cu 9 S 5 unit cell after dehydration. [ 32 ] Meanwhile, the single‐unit‐cell structure displays a stronger residual stress that results in the anisotropic shrinkage of each unit cell and finally lowers the cell parameters. [ 33 ] To our delight, the above‐mentioned phenomenon is clearly observed by a larger right shift of XRD curve.…”

Polyoxometalate Clusters: Sub-nanometer Building Blocks for Construction of Advanced Materials

“…Following the concept of cluster-nuclei co-assembly, 2D Janus-like free-standing ultrathin nanosheets constructed by Keggin POM/CoO are prepared via a single-step solvothermal method (Figure 12A). 126 The nanosheets are flat with an average thickness of 2.0 G 0.1 nm but are non-uniform in dimensions of length and width (Figure 12C). It is worth mentioning that the Janus nanosheets favor gathering at the interface when introduced into an immiscible solvent system such as toluene/water (Figure 12B), indicating the existence of two distinct faces of the Janus nanosheets, which is further evidenced by selectively labeling with citrate-capped Au nanoparticles.…”

POM‐Incorporated CoO Nanowires for Enhanced Photocatalytic Syngas Production from CO2

“…Based on a similar secondary component incorporation strategy, [34] we selected polyoxometalate (POM) as an additive to further modulate the structure and crystallinity, which has been intensively studied and applied in catalysis in our previous works. [35][36][37][38] The CoO UNWs were synthesized by a facile solvothermal process (Scheme 1). Cobalt acetylacetonate [Co(acac) 2 ] was chosen as metal source, n-hexane was used as solvent, while octylamine served as surfactant.…”