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Meeting Materials Science & Technology 2020
Symposium Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
Presentation Title Effect of Cation Pre-intercalation on the Electrochemical Performance of Multilayer Ti<sub>3</sub>C<sub>2</sub> MXene in Aqueous Electrolyte
Author(s) Kaitlyn E. Prenger, Ameer Al-Temimy, Kun Liang, Simone Raoux, Tristan Petit, Michael Naguib
On-Site Speaker (Planned) Kaitlyn E. Prenger
Abstract Scope Electrically conductive 2D transition metal carbides/nitrides (MXenes) have enormous potential for electrochemical energy storage, as they can host ions and protons and possess high electrical conductivity. While delaminated Ti<sub>3</sub>C<sub>2</sub> MXene paper has high capacitance, areal capacitance is limited. Multilayer Ti<sub>3</sub>C<sub>2</sub> shows modest values overall. Herein, we present the electrochemical performance of multilayer Ti<sub>3</sub>C<sub>2</sub> MXene pre-intercalated with cations (Na<sup>+</sup>, K<sup>+</sup>, Mg<sup>2+</sup>)in H<sub>2</sub>SO<sub>4</sub>. At 5 A/g, gravimetric capacitance of 325 F/g was achieved, comparable to delaminated Ti<sub>3</sub>C<sub>2</sub> electrodes, but much higher than reported for multilayer MXene. Moreover, areal capacitance up to 2 F/cm<sup>2</sup> was achieved. Intercalated multilayer Ti<sub>3</sub>C<sub>2</sub> yields an easier avenue for making Ti<sub>3</sub>C<sub>2</sub> supercapacitor electrodes with high areal capacitance. X-ray absorption spectroscopy shows that changing cations between layers alters the oxidation state of titanium atoms in Ti<sub>3</sub>C<sub>2</sub>, whereas dispersing Ti<sub>3</sub>C<sub>2</sub> in H<sub>2</sub>SO<sub>4</sub> resulted in reducing the surface titanium atoms. These results encourage further investigation into modifying Ti<sub>3</sub>C<sub>2</sub> interlayer chemistry.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Chemical Pre-intercalation Synthesis and Exfoliation of Bilayered Vanadium Oxides for Energy Storage Applications
Control Over Structure and Chemistry Across Multiple Lengthscales in Fe-Si-Ge-Based Thermoelectrics
d-Spacing Effect on the Electrochemical Performance of MXene in Organic and Room Temperature Ionic Liquids
Direct Synthesis of Nanoclusters from Cu Nanowires
Effect of Cation Pre-intercalation on the Electrochemical Performance of Multilayer Ti3C2 MXene in Aqueous Electrolyte
Explore Different Roles of Catalysts in the Growth of Si-based Nanostructures
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Multiscale Modeling of Radiation-induced Precipitation Hardening by Cu Nanoclusters in Fe-Cu Alloys
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Oxide Nucleation and Growth during In Situ Oxidation of Cu and Cu Alloys
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Purification of Carbon Nanotube Yarns via Incandescent Annealing
Rheological Dynamics of Liquid Crystal-coupled Nanocomposites under Influence of Thermal Gradients
The Formation Mechanism of TiO2 Polymorphs under Hydrothermal Conditions
Towards Superhard Binderless Nanocrystalline Tungsten Carbide
ZnO Nanoparticle-Poly(methyl methacrylate) Hybrid Ultraviolet Shielding Films

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