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

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journal contribution
posted on 2018-02-22, 12:19 authored by Varun Natu, Mallory Clites, Ekaterina Pomerantseva, Michel W. Barsoum

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 mesoporous architecture. Electrodes made with the latter showed capacities of 250 mAh g−1 at 20 mA g−1 in sodium-ion batteries. The rate performance, 120 mAh g−1 at 500 mA g−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.

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.

Funding

This work was funded by the Swedish Research Council (Project Grant No. 621-2014-4890). EP and MC thank the support from the National Science Foundation, Division of Materials Research (Grant No. DMR-1609272).

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