COVER This color-enhanced scanning electron microscopy image shows Ti2CCl2 MXenes grown by chemical vapor deposition. The two-dimensional layers of this material grew perpendicular to the substrate and then folded into microspherical structures. Ion intercalation between two-dimensional MXene sheets has potential for energy storage and other applications. See pages 1189 and 1242.
Credit: D. Wang et al., Science 379, 1242 (2023)