Nanoporous Hollow Transition Metal Chalcogenide Nanosheets Synthesized via the Anion-Exchange Reaction of Metal Hydroxides with Chalcogenide Ions

Abstract

Nanoporous hollow transition metal chalcogenides are of special interest for a variety of promising applications. Although some advanced synthetic methods have been reported, the development of a facile and general strategy to fabricate porous hollow nanostructures of transition metal chalcogenides, especially with enhanced electrocatalytic performance, still remains highly challenged. Herein, we report a facile chemical transformation strategy to prepare nanoporous hollow Co3S4 nanosheets via the anion exchange reaction of Co(OH)2 with sulfide ions. The chemical transformation mechanism involves the as-formed layer of nanoporous cobalt sulfide on Co(OH)2 driven by the anion-exchange-reaction and lattice mismatch induced quick strain release, a following diffusion-effect-dominated core-shell hollow intermediate with hollow interiors, and subsequent Ostwald ripening growth of hollow nanosheets at elevated temperatures. This anion-exchange strategy of transition metal hydroxides with chalcogenide ions is also suitable for fabricating nanoporous hollow nanosheets of other metal chalcogenides (e.g., CoSe2, CoTe2, CdS, and NiS). The as-prepared nanoporous hollow Co3S4 nanosheets are found to be highly active and stable for electrocatalytic oxygen evolution reaction.

High Energy Density Asymmetric Supercapacitors From Mesoporous NiCo2S4 Nanosheets

“…The phase of the as-prepared samples were explored by X-ray diffraction in These results above indicate that pure spinel NiCo2S4 could be prepared by anion exchange reaction [16] in terms of this novel method.…”

“…Besides, it is noted that the ion-exchange reaction could adjust the composition, structure and properties, taking a great effect on the purity and morphology of the NiCo2S4 [15,16] and it seems hard to obtain pure spinel NiCo2S4 by directly reacting Ni 2+ and Co 2+ with S 2-. Some sulphides such as Na2S [8,14,[17][18][19], thiourea [20,21] and thioacetamide [9,14] have been employed to prepared NiCo2S4 recently, and excellent electrochemical performance was demonstrated.…”

Holey 2D Nanomaterials for Electrochemical Energy Storage

“…Zhao et al explored a facile and general anion exchange strategy to synthesize the nanoporous hollow TMC nanosheets via chalcogenide ion exchange the transition metal hydroxides. [54] For example, nanoporous hollow Co 3 S 4 nanosheets with microsized sheet-like geometry can be obtained by anion exchange reaction of Co(OH) 2 nanosheets with thioacetamide. This method was general to the synthesis of other porous TMCs, including CoSe 2 , CoTe 2 , CdS, and NiS.…”

Diffusion-controlled synthesis of Cu-based for the Rochow reaction

“…The continuous oxidation could be extended from the outer surface to the interior space. Finally, porous CuO spheres resulting from Kirkendall effect are formed until all Cu 2 O are consumed and completely transformed to CuO by reacting with oxygen [46][47][48]. Cu 2 O oxidation can be also contributed to lattice diffusion.…”