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Mechanistic Understanding of the Interactions and Pseudocapacitance of Multi-Electron Redox Organic Molecules Sandwiched between MXene Layers
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2021 (English)In: Advanced Electronic Materials, E-ISSN 2199-160X, Vol. 7, no 4, p. 2001202-, article id 2001202Article in journal (Refereed) Published
Abstract [en]

Using a combined theoretical and experimental approach, a mechanistic understanding of the interactions and pseudocapacitance of different quinone-coupled viologen and pyridiniumium molecules sandwiched between titanium carbide (Ti3C2Tx) MXene layers has been provided. Three different derivatives of quinone-coupled viologen and pyridiniumium are synthesized using nucleophilic substitution reaction and subsequently hybridized with Ti3C2Tx MXene (organic@Ti3C2Tx) using self-assembly approach. The atomic structure of pristine Ti3C2Tx and organic@Ti3C2Tx hybrid films is investigated using grazing incidence X-ray diffraction and X-ray pair distribution function analysis using synchrotron radiation. Spectroscopic results confirm the coupling of quinones with viologen and pyridiniumium molecules and their non-covalent functionalization to the MXene without their catalytic decomposition. First-principles calculations confirm that the preferred orientation of organic molecules upon intercalation/adsorption is horizontal to the Ti3C2Tx surface. The authors reveal that these molecules attach to the Ti3C2Tx surface with a significantly high binding energy (up to −2.77 eV) via a charge transfer mechanism. The electronic structure calculations show that all organic@Ti3C2Tx hybrids preserved their metallic behavior. Free-standing organic@Ti3C2Tx hybrid films show a more than three times higher capacitance at ultra-high scan rates (up to 20 V s−1) compared to their pristine counterpart due to molecular pillaring of organic molecules between Ti3C2Tx layers via strong binding energies and charge transfer.

Place, publisher, year, edition, pages
Wiley , 2021. Vol. 7, no 4, p. 2001202-, article id 2001202
Keywords [en]
2D materials, hybrid materials, MXene, redox-active organic materials, supercapacitors, titanium carbide, Binding energy, Calculations, Charge transfer, Distribution functions, Electronic structure, Quinone, Substitution reactions, Synchrotron radiation, Catalytic decomposition, Charge transfer mechanisms, Electronic structure calculations, First-principles calculation, Grazing incidence X-ray diffraction, Non-covalent functionalization, Nucleophilic substitution reactions, Pair distribution function analysis, Molecules
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-307080DOI: 10.1002/aelm.202001202ISI: 000629302100001Scopus ID: 2-s2.0-85102497084OAI: oai:DiVA.org:kth-307080DiVA, id: diva2:1631363
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QC 20220124

Available from: 2022-01-24 Created: 2022-01-24 Last updated: 2022-06-25Bibliographically approved

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Ahuja, Rajeev

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