Yang Sheng, Zhang Panpan, Wang Faxing, Ricciardulli Antonio Gaetano, Lohe Martin R, Blom Paul W M, Feng Xinliang
Chair of Molecular Functional Materials and Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, Mommsenstraße 4, 01069, Dresden, Germany.
Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Angew Chem Int Ed Engl. 2018 Nov 19;57(47):15491-15495. doi: 10.1002/anie.201809662. Epub 2018 Oct 24.
Two-dimensional (2D) titanium carbide (Ti C ) 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 (Ti AlC ) in a binary aqueous electrolyte. The dissolution of aluminium followed by in situ intercalation of ammonium hydroxide results in the extraction of carbide flakes (Ti C T , 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 and 439 F cm , respectively, at a scan rate of 10 mV s , superior to those of LiF/HCl-etched MXenes. Our strategy paves a safe way to the scalable synthesis and application of MXene materials.
二维（2D）碳化钛（TiC）正成为MXene家族的重要成员。然而，基于氟化物的合成方法仍然阻碍了这类有前景材料的实际应用。在此，我们展示了一种基于在二元水性电解质中对碳化钛铝（TiAlC）进行阳极腐蚀的高效无氟蚀刻方法。铝的溶解以及随后氢氧化铵的原位插层导致提取出尺寸达18.6μm且单层和双层产率高（超过90%）的碳化物薄片（TiCT，T = O，OH）。基于剥落片材的全固态超级电容器在扫描速率为10 mV s时分别表现出220 mF cm和439 F cm的高面积电容和体积电容，优于LiF/HCl蚀刻的MXene。我们的策略为MXene材料的可扩展合成与应用铺平了一条安全的道路。
