Journal Article electrocatalysts 2D materials 3D cages 3D‐fused aromatic ladder structure C5N Ir nanoparticles Review anode materials cage-like organic networks carrier mobility covalent organic frameworks dimension control durability energy conversion energy storage extreme environmental conditions field-effect transistors fused aromatic network fused aromatic networks holey nanocarbon hydrogen evolution reaction lithium-ion batteries polyaniline stability triboelectric nanogenerator