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Graphdiyne can serve as both the electron‐acceptor and electron‐donor due to its distinct topological and electronic structure. The unique electron‐transfer behavior promotes its widespread applications. In article number 1800959, Dan Wang and co‐workers discuss advances in how graphdiyne and its composite materials are used for photo‐ and electrochemical energy conversion areas, such as solar cells, photocatalysis, water splitting, and fuel cells. [ABSTRACT FROM AUTHOR]

As a rising star of carbon allotropes, graphynes (GYs) merely consist of sp‐ and sp2‐hybridized carbon atoms, which endow them a large conjugated network and expanded 2D porous structure. With unique topological structure, GYs display unusual semiconducting properties, especially in the aspects of charge mobility and electron transport. Among the members of the GY family, only graphdiyne (GD) can be successfully synthesized in large quantities. The advanced properties of GD make it promising in various applications. Here, the recent progress in the synthesis of GD and GD‐based composites is reviewed as well as their applications in photorelated and electrocatalytic applications. It is hoped that this Review will promote the development and applications of carbon chemistry. Graphdiyne (GD), a novel carbon allotrope with unique 2D topological structure, exhibits unusual semiconducting properties, especially in the aspects of charge and mass mobility. By controlled preparation and functionalization methods, GD‐based composite materials demonstrate great promises in photo‐ and electrochemical energy conversion areas, such as solar cells, photocatalysis, water splitting, and fuel cells. [ABSTRACT FROM AUTHOR]