Abstract
Here, the interaction mechanism of 1-aminoanthraquinone (AQ) on Ti3C2Tx MXene by noncovalent (AQ@Ti3C2Tx) and covalent (AQ-Ti3C2Tx) functionalization is reported. Spectroscopic, X-ray, and scattering techniques confirmed noncovalent functionalization of AQ on Ti3C2Tx MXene without its catalytic decomposition, resulting in intercalation and interaction of AQ with Ti3C2Tx MXene. Diazonium reaction was further used to covalently functionalize AQ molecules on Ti3C2Tx MXene. Optimized AQ-Ti3C2Tx freestanding electrodes of ∼44 μm thickness delivered capacitance of ∼300 F/g and improved rate performance compared to the pristine counterpart (Ti3C2Tx) due to carbonyl redox of AQ and improved ionic transport between MXene layers due to pillaring of AQ molecules.
Original language | English |
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Pages (from-to) | 4127-4133 |
Number of pages | 7 |
Journal | ACS Applied Energy Materials |
Volume | 3 |
Issue number | 5 |
DOIs | |
State | Published - May 26 2020 |
Funding
We thank Prof. Yury Gogotsi for advice and helpful discussions. This work was supported as part of the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences. Work at ORNL was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for the U.S. DOE under Contract DEAC05-00OR22725. We acknowledge the support of the National Institute of Standards and Technology, Center for Neutron Research, U.S. Department of Commerce, in providing the research neutron facilities used in this work. Access to USANS BT5 and NGB30SANS was provided by the Center for High Resolution Neutron Scattering, a partnership between the National Institute of Standards and Technology and the National Science Foundation under Agreement DMR-1508249.
Keywords
- MXene
- pseudocapacitance
- quinone
- redox
- supercapacitor
- titanium carbide