Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 16, Pages 4810-4814Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201500110
Keywords
C; S nanolaminates; electrochemical etching; layered structures; MAX phase; selective extraction
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [ER46473]
- Chinese Scholarship Council (CSC)
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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.
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