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      Dye adsorption and decomposition on two-dimensional titanium carbide in aqueous media

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          Abstract

          Herein we report on the adsorption and photocatalytic decomposition of organic molecules in aqueous environments containing two-dimensional Ti3C2Tx, a representative of the MXene family.

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          Intercalation and delamination of layered carbides and carbonitrides.

          Olha Mashtalir, Michael Naguib, Vadym Mochalin … (2013)
          Intercalation and delamination of two-dimensional solids in many cases is a requisite step for exploiting their unique properties. Herein we report on the intercalation of two-dimensional Ti3C2, Ti3CN and TiNbC-so called MXenes. Intercalation of hydrazine, and its co-intercalation with N,N-dimethylformamide, resulted in increases of the c-lattice parameters of surface functionalized f-Ti3C2, from 19.5 to 25.48 and 26.8 Å, respectively. Urea is also intercalated into f-Ti3C2. Molecular dynamics simulations suggest that a hydrazine monolayer intercalates between f-Ti3C2 layers. Hydrazine is also intercalated into f-Ti3CN and f-TiNbC. When dimethyl sulphoxide is intercalated into f-Ti3C2, followed by sonication in water, the f-Ti3C2 is delaminated forming a stable colloidal solution that is in turn filtered to produce MXene 'paper'. The latter shows excellent Li-ion capacity at extremely high charging rates.
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            Are MXenes promising anode materials for Li ion batteries? Computational studies on electronic properties and Li storage capability of Ti3C2 and Ti3C2X2 (X = F, OH) monolayer.

            Qing Tang, Zhen Zhen Zhou, Panwen Shen (2012)
            Density functional theory (DFT) computations were performed to investigate the electronic properties and Li storage capability of Ti(3)C(2), one representative MXene (M represents transition metals, and X is either C or/and N) material, and its fluorinated and hydroxylated derivatives. The Ti(3)C(2) monolayer acts as a magnetic metal, while its derived Ti(3)C(2)F(2) and Ti(3)C(2)(OH)(2) in their stable conformations are semiconductors with small band gaps. Li adsorption forms a strong Coulomb interaction with Ti(3)C(2)-based hosts but well preserves its structural integrity. The bare Ti(3)C(2) monolayer exhibits a low barrier for Li diffusion and high Li storage capacity (up to Ti(3)C(2)Li(2) stoichiometry). The surface functionalization of F and OH blocks Li transport and decreases Li storage capacity, which should be avoided in experiments. The exceptional properties, including good electronic conductivity, fast Li diffusion, low operating voltage, and high theoretical Li storage capacity, make Ti(3)C(2) MXene a promising anode material for Li ion batteries.
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              New two-dimensional niobium and vanadium carbides as promising materials for Li-ion batteries.

              Michael Naguib, Joseph Halim, Jun Lu … (2013)
              New two-dimensional niobium and vanadium carbides have been synthesized by selective etching, at room temperature, of Al from Nb2AlC and V2AlC, respectively. These new matrials are promising electrode materials for Li-ion batteries, demonstrating good capability to handle high charge-discharge rates. Reversible capacities of 170 and 260 mA·h·g(-1) at 1 C, and 110 and 125 mA·h·g(-1) at 10 C were obtained for Nb2C and V2C-based electrodes, respectively.
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                Author and article information

                Journal
                Journal ID (publisher-id): JMCAET
                Title: J. Mater. Chem. A
                Abbreviated Title: J. Mater. Chem. A
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 2050-7488
                ISSN (Electronic): 2050-7496
                Publication date Created: 2014
                Publication date (Print): 2014
                Volume: 2
                Issue: 35
                Pages: 14334-14338
                Article
                DOI: 10.1039/C4TA02638A
                SO-VID: 95b9bdf5-9fd7-432c-b52c-ea8d0c737ca5
                Copyright © © 2014
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