Synthesis of Carbon/Sulfur Nanolaminates by Electrochemical Extraction of Titanium from Ti 2 SC

Meng-Qiang Zhao (1) , Morgane Sedran (2) , Zheng Ling (1) , Maria R. Lukatskaya (1) , Olha Mashtalir (1) , Michael Ghidiu (1) , Boris Dyatkin (1) , Darin J. Tallman (1) , Thierry Djenizian (2) , Michel W. Barsoum (1) , Yury Gogotsi (1)

1 A.J. Drexel Nanomaterials Institute (Philadelphia, USA)
2 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie

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.

Mots clés: C; S nanolaminates; electrochemical etching; layered structures; MAX phase; selective extraction

Domaines: Matériaux

Meng-Qiang Zhao, Morgane Sedran, Zheng Ling, Maria R. Lukatskaya, Olha Mashtalir, et al.. Synthesis of Carbon/Sulfur Nanolaminates by Electrochemical Extraction of Titanium from Ti 2 SC. Angewandte Chemie International Edition, 2015, 54 (16), pp.4810 - 4814. ⟨10.1002/anie.201500110⟩. ⟨hal-01416761⟩