2D oxide nanomaterials constitute a broad range of materials, with a wide array of current and potential applications, particularly in the fields of energy storage and catalysis for sustainable energy production. Despite the many similarities in structure, composition, and synthetic methods and uses, the current literature on layered oxides is diverse and disconnected. A number of reviews can be found in the literature, but they are mostly focused on one of the particular subclasses of 2D oxides. This review attempts to bridge the knowledge gap between individual layered oxide types by summarizing recent developments in all important 2D oxide systems including supported ultrathin oxide films, layered clays and double hydroxides, layered perovskites, and novel 2D-zeolite-based materials. Particular attention is paid to the underlying similarities and differences between the various materials, and the subsequent challenges faced by each research community. The potential of layered oxides toward future applications is critically evaluated, especially in the areas of electrocatalysis and photocatalysis, biomass conversion, and fine chemical synthesis. Attention is also paid to corresponding novel 3D materials that can be obtained via sophisticated engineering of 2D oxides.

Department of Physical and Macromolecular Chemistry Faculty of Science Charles University Prague Hlavova 8 128 43 Prague 2 Czech Republic

Dept s MIFT and ChiBioFarAm Industrial Chemistry University of Messina ERIC aisbl and CASPE INSTM 5 le F Stagno S'Alcontres 31 98166 Messina Italy

J Heyrovský Institute of Physical Chemistry Czech Academy of Science Dolejškova 3 182 23 Prague 8 Czech Republic

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ADOR zeolite with 12 × 8 × 8-ring pores derived from IWR germanosilicate