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  5. Prediction of Optimal Synthesis Conditions for the Formation of Ordered Double-Transition-Metal MXenes (o-MXenes)
 
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Prediction of Optimal Synthesis Conditions for the Formation of Ordered Double-Transition-Metal MXenes (o-MXenes)

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Download select_etch.pdf2.21 MB
Author(s)
Caffrey, Nuala M. 
Uri
http://hdl.handle.net/10197/12528
Date Issued
02 August 2020
Date Available
30T15:42:43Z September 2021
Abstract
o-MXenes are a family of layered double-transition-metal carbides and nitrides with a unique out-of-plane ordering of the two metal atoms. Their chemical versatility means they have novel applications in energy storage, catalysis, and sensing devices. o-MXenes are synthesized from their precursor o-MAX phase materials using a chemical etching process, although yields are typically low. The optimal conditions necessary for the etching of MAX phase materials can be predicted using Pourbaix diagrams. Here, Pourbaix diagrams produced from first-principles calculations are used to determine the conditions necessary to enhance the yields of o-MXenes. In agreement with experiment, we show that high yields of (Mo, Ti)2CTx are possible, as the o-MXene is stable relative to known competing ionic and molecular species in an aqueous solution across a wide range of pH and applied potentials. We show how the stability of the o-MXene depends on the nature of the terminating groups and the presence of metal vacancies on the o-MXene surface.
Sponsorship
Science Foundation Ireland
Type of Material
Journal Article
Publisher
American Chemical Society
Journal
The Journal of Physical Chemistry C
Volume
124
Issue
34
Start Page
18797
End Page
18804
Copyright (Published Version)
2020 American Chemical Society
Keywords
  • Metal carbides

  • Metal nitrides

  • Density functional th...

  • Pourbaix diagrams

DOI
10.1021/acs.jpcc.0c05348
Language
English
Status of Item
Peer reviewed
ISSN
1932-7447
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Owning collection
Physics Research Collection
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