Fluoride-Free Synthesis of Two-Dimensional Titanium Carbide (MXene) Using A Binary Aqueous System.

By Sheng Yang, Panpan Zhang, Faxing Wang, A. G. Ricciardulli, Martin R. Lohe, Paul W. M. Blom, Xinliang Feng. Angewandte Chemie, 2018

845 citations recorded by the source corpus.

Two-dimensional (2D) titanium carbide (Ti3 C2 ) is emerging as an important member of the MXene family. However, fluoride-based synthetic procedures remain an impediment to the practical applications of this promising class of materials. Here we demonstrate an efficient fluoride-free etching method based on the anodic corrosion of titanium aluminium carbide (Ti3 AlC2 ) in a binary aqueous electrolyte. The dissolution of aluminium followed by in situ intercalation of ammonium hydroxide results in the extraction of carbide flakes (Ti3 C2 Tx , T=O, OH) with sizes up to 18.6 μm and high yield (over 90 %) of mono- and bilayers. All-solid-state supercapacitor based on exfoliated sheets exhibits high areal and volumetric capacitances of 220 mF cm-2 and 439 F cm-3 , respectively, at a scan rate of 10 mV s-1 , superior to those of LiF/HCl-etched MXenes. Our strategy paves a safe way to the scalable synthesis and application of MXene materials.

Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/a2a7bf976345fe923cae35a35038f602def6dfbf

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Materials Chemistry

In Renewable Energy, Sustainability and the Environment

Citations in the corpus

Two‐dimensional MXenes for lithium‐sulfur batteries (2020, methodology): “To boost the yield of nanosheets, other novel methods such as electro-chemical etching and microwave-assisted delamination strategies have been developed.(37,38) During the electro-chemical etching process, Ti3AlC2 can be etched in the Cl − containing electrolyte under a low potential as Cl has a st”
Overview of the synthesis of MXenes and other ultrathin 2D transition metal carbides and nitrides (2019, positive): “Another F-free etching method based on the anodic corrosion of Ti 3 AlC 2 in an electrolyte mixture of NH 4 Cl and tetramethylammonium hydroxide (TMAOH) has been reported with a yield of > 40% 63 .”
One MAX phase, different MXenes: A guideline to understand the crucial role of etching conditions on Ti3C2Tx surface chemistry (2020, methodology): “Other methods, including electrochemical etching [40,41] and etching with molten salts”
MXenes: focus on optical and electronic properties and corresponding applications (2020, background): “reported a high yield of more than 90% of monolayers and bilayers of Ti3C2Tx from Ti3AlC2 using a binary aqueous electrolyte [13].”
MXetronics: Electronic and photonic applications of MXenes (2019, methodology): “This suggests that annealing not only removes the defects at the interface but also affects the surface functional groups of Ti3C2Tx MXene.”