In this review, we selectively summarize the recent advances in mesoporous g-C₃N₄(mpg-C₃N₄), including synthesis strategies, characterization techniques, fundamental properties, functional modifications and potential applications. Several difficulties and emerging issues are also proposed.

In this review, we highlight the important progress made in the diversified Cu _2−x S micro-/nanostructures, including synthesis strategies, formation mechanisms, functional modifications and potential applications. Several emerging issues and perspective are also given.

In this review, we mainly highlight the advances made in the development of amorphous TiO₂nanostructures for photocatalysts. Some perspectives on the challenges and new direction are also discussed.

In this review, we highlight the significant advancements in morphological zinc stannate (ZnSnO₃and Zn₂SnO₄) micro/nanostructures, including synthetic strategies, fundamental properties and potential applications. Several emerging issues and prospective are also discussed.

Exposed high-index facets with a high density of low-coordinated atoms (including edges, steps and kinks) can provide more high-active sites for chemical reactions. Therefore, great progress has made in the facet-dependent application of various high-index faceted micro-/nanostructures in the past decades. Previous review papers have mainly highlighted the advances in high-index faceted noble metal nanocrystals. However, to date, there is no specialized review paper on high-index faceted metal oxides and their facet-dependent applications. Thus, in this review, the existing high-index faceted metal oxide micro-/nanostructures, including Cu₂O, TiO₂, Fe₂O₃, ZnO, SnO₂ and BiVO₄, are reviewed based on their characterization, synthesis engineering and facet-dependent applications in the fields of catalysis, sensors, lithium-ion batteries and carbon monoxide oxidation. Also, several challenges and perspectives are presented. Hopefully, this review article will be a useful guideline and resource for researchers currently concentrating on high-index faceted metal oxides to design and synthesize novel micro-/nanostructures for overcoming the practical environment-, biology- and energy-related problems.