Recent advances in the synthesis of layered double hydroxides nanosheets

초록

Layered double hydroxide (LDH) with characteristic two-dimensional structureand positive layer charge has attracted attention in a wide range of applica-tions in recent years. Although LDH with a layer-by-layer structure has highapplicability as a catalyst, adsorbent, drug reservoir, and so on, it has beensuggested that the single-layered LDH nanosheets not only enhance the per-formance but also expand the application in electrocatalyst, batteries, andsupercapacitors due to the increased active sites in nanosheets. In this review,we introduced state of the art in the synthesis of LDH nanosheets in terms ofsynthesis approaches, mechanisms, and properties of thus obtained LDHnanosheets. The synthesis approaches are primarily categorized into two parts,namely, top-down synthesis to delaminate bulk LDH and bottom-up synthesisto obtain single-layer LDH in limited space. In the first section, the exfoliationof LDH, which was realized by weakening the layer-by-layer stacking andby increasing the basal distance, was summarized mainly based on theswelling mechanism. In the second section, the bottom-up syntheses of LDHnanosheets through controlled crystal growth in confined space or restrictedsynthetic conditions are introduced.

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