Lookup NU author(s): Dr Jochen Friedl,
Professor Ulrich Stimming
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Wiley - V C H Verlag GmbH & Co. KGaA, 2016.
For re-use rights please refer to the publisher's terms and conditions.
A novel core–shell heterostructure with multi-walled carbon nanotubes (MWCNTs) as the core and graphene oxide nanoribbons (GONRs) as the shell (MWCNT@GONR) is investigated for the first time as anode material for Na-ion batteries (NIBs) in this study. The MWCNT@GONR material with carboxylic acid groups has been synthesized through unzipping of MWCNTs by a microwave-assisted process. The influence of the amount of carboxylic acid groups on the electrochemistry of MWCNT@GONR is investigated in this work by applying thermal treatment at different temperatures. In this MWCNT@GONR core-shell structure, the MWCNTs between flat GONR sheets prevent the restacking problem of graphene and enable penetration of the electrolyte. MWCNTs provide high electronic conductivity and direct electron transfer path while GONRs provide high surface area and defect sites (carboxylic acid groups, COOH-) that can adsorb more Na ions on the surface thereby increasing capacity. MWCNT@GONR provides high capacity (317 mA h g−1) at a current density of 50 mA h g−1 in the second cycle. A full cell using MWCNT@GONR as anode and P2-NaxMnO2 as cathode is fabricated and it exhibits a high energy density of 99 Wh kg−1 which successfully demonstrates that MWCNT@GONR is a promising anode material for NIB applications.
Author(s): Chen HY, Bucher N, Hartung S, Li L, Friedl J, Liou HP, Sun CL, Stimming U, Srinivasan M
Publication type: Article
Publication status: Published
Journal: Advanced Materials Interfaces
Print publication date: 19/10/2016
Online publication date: 06/09/2016
Acceptance date: 01/08/2016
Date deposited: 24/11/2016
ISSN (electronic): 2196-7350
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
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