Fig. 1: Morphology and microstructure of integrated and scalable metamaterial catalyst.
From: Harnessing screw dislocations in shell-lattice metamaterials for efficient, stable electrocatalysts
a Scanning electron micrographs showing the breakdown of the architecture hierarchy of the shell-lattice metamaterial, including a first-order unit cell of 2 mm, a first-order pore diameter of ~900 μm, a second-order pore diameter of ~100 μm, smooth thin walls with a feature size down to ~10 μm in wall thickness, and twisted nanosteps. Scale bar: 2 mm for unit cell, 900 μm for first-order structure, 100 μm for second-order structure, and 10 μm for thin-wall thickness. b SEM images depicting various nanostep morphologies. Scale bar: 500 nm. c AFM images displaying various zoom-in nanostep morphologies. Scale bar: 200 nm. d Schematic diagrams demonstrate the polymorphism varying from circles to the octagons of nanosteps morphology. e–g Representative chirality feature of nanoplates. Scale bar: 1 μm. h Scatter plot and linear fitting curve of the evolving twist angles θ in e as a function of layer number counted from the bottom to the top. The average θ is equal to 6.1°. Source data are provided as a Source Data file.
