Understanding the MXene Pseudocapacitance
Abstract
MXenes have attracted great attention as next-generation capacitive energy-storage materials, but the mechanisms underlying their pseudocapacitive behavior are not well understood. Here we provide a theoretical description of the surface redox process of Ti3C2Tx (T = O, OH), a prototypical MXene, in 1 M H2SO4 electrolyte, based on joint density functional theory with an implicit solvation model and the analysis of Gibbs free energy under a constant-electrode potential. From the dependence of the O/OH ratio (or the surface H coverage) and the surface charge on the applied potential, we obtain a clear picture of the capacitive energy-storage mechanism of Ti3C2Tx that shows good agreement with previous experimental findings in terms of the integral capacitance and Ti valence change. We find a voltage-dependent redox/double-layer co-charging behavior: the capacitive mechanism is dominated by the redox process, but the electric double-layer charge works against the redox process. This new insight may be useful in improving the capacitance of MXenes.
- Authors:
-
[2];
[4];
[3];
[1]
- Univ. of California, Riverside, CA (United States)
- Tulane Univ., New Orleans, LA (United States)
- Drexel Univ., Philadelphia, PA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1493989
- Alternate Identifier(s):
- OSTI ID: 1484259
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry Letters
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 6; Journal ID: ISSN 1948-7185
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Zhan, Cheng, Naguib, Michael, Lukatskaya, Maria, Kent, Paul R. C., Gogotsi, Yury, and Jiang, De-en. Understanding the MXene Pseudocapacitance. United States: N. p., 2018.
Web. doi:10.1021/acs.jpclett.8b00200.
Zhan, Cheng, Naguib, Michael, Lukatskaya, Maria, Kent, Paul R. C., Gogotsi, Yury, & Jiang, De-en. Understanding the MXene Pseudocapacitance. United States. https://doi.org/10.1021/acs.jpclett.8b00200
Zhan, Cheng, Naguib, Michael, Lukatskaya, Maria, Kent, Paul R. C., Gogotsi, Yury, and Jiang, De-en. Tue .
"Understanding the MXene Pseudocapacitance". United States. https://doi.org/10.1021/acs.jpclett.8b00200. https://www.osti.gov/servlets/purl/1493989.
@article{osti_1493989,
title = {Understanding the MXene Pseudocapacitance},
author = {Zhan, Cheng and Naguib, Michael and Lukatskaya, Maria and Kent, Paul R. C. and Gogotsi, Yury and Jiang, De-en},
abstractNote = {MXenes have attracted great attention as next-generation capacitive energy-storage materials, but the mechanisms underlying their pseudocapacitive behavior are not well understood. Here we provide a theoretical description of the surface redox process of Ti3C2Tx (T = O, OH), a prototypical MXene, in 1 M H2SO4 electrolyte, based on joint density functional theory with an implicit solvation model and the analysis of Gibbs free energy under a constant-electrode potential. From the dependence of the O/OH ratio (or the surface H coverage) and the surface charge on the applied potential, we obtain a clear picture of the capacitive energy-storage mechanism of Ti3C2Tx that shows good agreement with previous experimental findings in terms of the integral capacitance and Ti valence change. We find a voltage-dependent redox/double-layer co-charging behavior: the capacitive mechanism is dominated by the redox process, but the electric double-layer charge works against the redox process. This new insight may be useful in improving the capacitance of MXenes.},
doi = {10.1021/acs.jpclett.8b00200},
journal = {Journal of Physical Chemistry Letters},
number = 6,
volume = 9,
place = {United States},
year = {2018},
month = {2}
}
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Figures / Tables:
Figure 1: Partially protonated Ti3C2O2 as a prototypical MXene electrode in an acidic electrolyte: side view (left) and top view (right). The 2D material has an ideal surface area (counting two sides) of ∼479 m2/g.
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