Mesoporous MXene powders synthesized by acid induced crumpling and their use as Na-ion battery anodes

Manipulating the shapes of, otherwise flat, two-dimensional, 2D, flakes is important in many applications. Herein by simply decreasing the pH of a Ti3C2Tx MXene colloidal suspension, the 2D nanolayers crash out Into crumpled flakes, resulting in randomly oriented powders, with a mesoporousarchitecture. Electrodes made with the latter showed capacities of 250 mAh g(_1) at 20 mAg(-1) in sodium-ion batteries. The rate performance, 120 mAh g(-1) at 500 mAg(-1), was also respectable. This acid-induced, reversible, crumpling approach is facile and scalable and could prove Important In electrochemical, biological, catalytic, and environmental MXene-based applications [GRAPHICS] [GRAPHICS] IMPACT STATEMENT By simply decreasing the pH of a Ti3C2TX colloidal suspension, we induce the 2D flakes flocculate into mesoporous crumpled flakes, that we then show can be used as Na-ion battery anodes.