Table 1: Characteristics of Cu2O crystals produced by free dealloying.

Corrosion media Dealloying time Morphology Edge length Area percentage (%) HF 4 min Cube ~90 nm 26.5 HCl 6 h Cuboctahedron ~300 nm 12.2 8 h Truncated octahedron ~150 nm 13.9 14 h Octahedron ~1.2 μm 15.8 20 h Hexapods ~500 nm 14.4 24 h Dendrite ~1.4 μm (dendrite length) 14.3 Total 19.8 Octahedron-detached hexapods ~1.1 μm 5.5