Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2015-04-13

Journal: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Included Journals: Scopus、EI、SCIE

Volume: 54

Issue: 16

Page Number: 4810-4814

ISSN: 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.