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Indexed by:期刊论文

Date of Publication:2015-04-13

Journal:ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Included Journals:SCIE、EI、Scopus

Volume:54

Issue:16

Page Number:4810-4814

ISSN No.:1433-7851

Key Words:C; S nanolaminates; electrochemical etching; layered structures; MAX phase; selective extraction

Abstract: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.