Synthesis of Carbon/Sulfur Nanolaminates by Electrochemical Extraction of Titanium from Ti2SC

Herein we electrochemically and selectively extract Ti from the MAX phase Ti2SC to form carbon/sulfur (C/S) nanolaminates at room temperature. The products are composed of multi‐layers of C/S flakes, with predominantly amorphous and some graphene‐like structures. Covalent bonding between C and S is observed in the nanolaminates, which render the latter promising candidates as electrode materials for Li‐S batteries. We also show that it is possible to extract Ti from other MAX phases, such as Ti3AlC2 , Ti3SnC2 , and Ti2GeC, suggesting that electrochemical etching can be a powerful method to selectively extract the “M” elements from the MAX phases, to produce “AX” layered structures, that cannot be made otherwise. The latter hold promise for a variety of applications, such as energy storage, catalysis, etc. Kohlenstoff/Schwefel‐Nanolaminate aus mehrlagigen C/S‐Flocken mit überwiegend amorphen und teils Graphen‐artigen Strukturen wurden durch elektrochemische Extraktion von Ti aus einer Ti2SC‐MAX‐Phase synthetisiert. Dieser Ansatz bietet eine neuartige Methode für die Raumtemperatursynthese von schichtförmigen „AX“‐Strukturen durch die selektive Extraktion von „M“ aus MAX‐Phasen.