Dataset Information

Flexible Free-Standing MoO₃/Ti₃C₂T _z MXene Composite Films with High Gravimetric and Volumetric Capacities.

ABSTRACT: Enhancing both the energy storage and power capabilities of electrochemical capacitors remains a challenge. Herein, Ti₃C₂T _z MXene is mixed with MoO₃ nanobelts in various mass ratios and the mixture is used to vacuum filter binder free, open, flexible, and free-standing films. The conductive Ti₃C₂T _z flakes bridge the nanobelts, facilitating electron transfer; the randomly oriented, and interconnected, MoO₃ nanobelts, in turn, prevent the restacking of the Ti₃C₂T _z nanosheets. Benefitting from these advantages, a MoO₃/Ti₃C₂T _z film with a 8:2 mass ratio exhibits high gravimetric/volumetric capacities with good cyclability, namely, 837 C g^-1 and 1836 C cm^-3 at 1 A g^-1 for an ? 10 µm thick film; and 767 C g^-1 and 1664 C cm^-3 at 1 A g^-1 for ? 50 µm thick film. To further increase the energy density, hybrid capacitors are fabricated with MoO₃/Ti₃C₂T _z films as the negative electrodes and nitrogen-doped activated carbon as the positive electrodes. This device delivers maximum gravimetric/volumetric energy densities of 31.2 Wh kg^-1 and 39.2 Wh L^-1, respectively. The cycling stability of 94.2% retention ratio after 10 000 continuous charge/discharge cycles is also noteworthy. The high energy density achieved in this work can pave the way for practical applications of MXene-containing materials in energy storage devices.

SUBMITTER: Zheng W

PROVIDER: S-EPMC7856882 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Publications

Flexible Free-Standing MoO3/Ti3C2T z MXene Composite Films with High Gravimetric and Volumetric Capacities.

Zheng Wei W Halim Joseph J El Ghazaly Ahmed A Etman Ahmed S AS Tseng Eric Nestor EN Persson Per O Å POÅ Rosen Johanna J Barsoum Michel W MW

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20201231 3

Enhancing both the energy storage and power capabilities of electrochemical capacitors remains a challenge. Herein, Ti3C2T z MXene is mixed with MoO3 nanobelts in various mass ratios and the mixture is used to vacuum filter binder free, open, flexible, and free-standing films. The conductive Ti3C2T z flakes bridge the nanobelts, facilitating electron transfer; the randomly oriented, and interconnected, MoO ...[more]

PMID: 33552874

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Project description:Tissue engineered cardiac patches have great potential as a therapeutic treatment for myocardial infarction (MI). However, for successful integration with the native tissue and proper function of the cells comprising the patch, it is crucial for these patches to mimic the ordered structure of the native extracellular matrix and the electroconductivity of the human heart. In this study, a new composite construct that can provide both conductive and topographical cues for human induced pluripotent stem cell derived cardiomyocytes (iCMs) is developed for cardiac tissue engineering applications. The constructs are fabricated by 3D printing conductive titanium carbide (Ti3C2Tx) MXene in pre-designed patterns on polyethylene glycol (PEG) hydrogels, using aerosol jet printing, at a cell-level resolution and then seeded with iCMs and cultured for one week with no signs of cytotoxicity. The results presented in this work illustrate the vital role of 3D-printed Ti3C2Tx MXene on aligning iCMs with a significant increase in MYH7, SERCA2, and TNNT2 expressions, and with an improved synchronous beating as well as conduction velocity. This study demonstrates that 3D printed Ti3C2Tx MXene can potentially be used to create physiologically relevant cardiac patches for the treatment of MI. STATEMENT OF SIGNIFICANCE: As cardiovascular diseases and specifically myocardial infarction (MI) continue to be the leading cause of death worldwide, it is critical that new clinical interventions be developed. Tissue engineered cardiac patches have shown significant potential as clinical therapeutics to promote recovery following MI. Unfortunately, current constructs lack the ordered structure and electroconductivity of native human heart. In this study, we engineered a composite construct that can provide both conductive and topographical cues for human induced pluripotent stem cell derived cardiomyocytes. By 3D printing conductive Ti3C2Tx MXene in pre-designed patterns on polyethylene glycol hydrogels, using aerosol jet printing, at a cell-level resolution, we developed tissue engineered patches that have the potential for providing a new clinical therapeutic to combat cardiovascular disease.

Dataset Information

Flexible Free-Standing MoO₃/Ti₃C₂T _z MXene Composite Films with High Gravimetric and Volumetric Capacities.

Publications

Flexible Free-Standing MoO<sub>3</sub>/Ti<sub>3</sub>C<sub>2</sub>T <i><sub>z</sub></i> MXene Composite Films with High Gravimetric and Volumetric Capacities.

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