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Title: Effects of Applied Potential and Water Intercalation on the Surface Chemistry of Ti2C and Mo2C MXenes

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3]; ORCiD logo [2]; ORCiD logo [4]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Drexel Univ., Philadelphia, PA (United States)
  3. Agency for Science, Technology and Research (A*STAR) (Singapore)
  4. Univ. of Pennsylvania, Philadelphia, PA (United States)

Here, two-dimensional transition metal carbides and nitrides, also known as MXenes, represent an attractive class of materials for a multitude of electrochemical and other applications. While single sheets of MXenes have been widely studied theoretically, there have been much fewer studies on layered bulk MXenes, which are more representative of multi- or few-layer MXenes used in actual applications. Herein, we investigate the structural and electronic effects of water intercalation, multiple functional groups and applied potential on layered bulk Ti2C and Mo2C MXenes using density functional theory. The out-of plane lattice parameter, c, was found to vary significantly with the functional group, and is greatly increased upon intercalation of water. Experimental results confirm the change in lattice constant due to addition or removal of intercalated water. Under zero applied potential, both Ti2C and Mo2C were found to be functionalized by one monolayer of O; bare MXenes were never found to be stable, regardless of the applied potential. Applying a potential changed the adsorbate coverage, changing the systems from O covered to H covered at negative potentials and, in some cases, giving rise to a metal–insulator transition. Understanding of the effects of surface functionalization and water intercalation of MXenes provides a better insight of their use for catalytic and electronic applications.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1360912
Journal Information:
Journal of Physical Chemistry. C, Vol. 120, Issue 50; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 92 works
Citation information provided by
Web of Science

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Cited By (8)

Synthesis and photocatalytic H 2 ‐production activity of plasma‐treated Ti 3 C 2 T x MXene modified graphitic carbon nitride journal September 2019
Surface and Interface Engineering: Molybdenum Carbide–Based Nanomaterials for Electrochemical Energy Conversion journal September 2019
Recent Progress of MXene-Based Nanomaterials in Flexible Energy Storage and Electronic Devices journal December 2018
Engineering Multifunctional Collaborative Catalytic Interface Enabling Efficient Hydrogen Evolution in All pH Range and Seawater journal July 2019
Oxidized Ti 3 C 2 MXene nanosheets for dye-sensitized solar cells journal January 2018
Strong Surface‐Bound Sulfur in Carbon Nanotube Bridged Hierarchical Mo 2 C‐Based MXene Nanosheets for Lithium–Sulfur Batteries journal December 2018
MXene‐Based Composites: Synthesis and Applications in Rechargeable Batteries and Supercapacitors journal February 2019
A Robust, Freestanding MXene‐Sulfur Conductive Paper for Long‐Lifetime Li–S Batteries journal May 2019

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