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  Tuning the surface chemistry of mxene to improve energy storage : example of nitrification by salt melt

Liu, L., Zschiesche, H., Antonietti, M., Daffos, B., Tarakina, N. V., Gibilaro, M., et al. (2023). Tuning the surface chemistry of mxene to improve energy storage: example of nitrification by salt melt. Advanced Energy Materials, 13(2): 2202709. doi:10.1002/aenm.202202709.

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 Urheber:
Liu, Liyuan, Autor
Zschiesche, Hannes1, Autor           
Antonietti, Markus2, Autor                 
Daffos, Barbara, Autor
Tarakina, Nadezda V.1, Autor                 
Gibilaro, Mathieu, Autor
Chamelot, Pierre, Autor
Massot, Laurent, Autor
Duployer, Benjamin, Autor
Taberna, Pierre-Louis, Autor
Simon, Patrice, Autor
Affiliations:
1Nadezda V. Tarakina, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2522693              
2Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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Schlagwörter: molten salt approach; pseudocapacitance; supercapacitors; surface termination; Ti3C2Tx MXene
 Zusammenfassung: The unique properties of 2D MXenes, such as metal-like electrical conductivity and versatile surface chemistry, make them appealing for various applications, including energy storage. While surface terminations of 2D MXene are expected to have a key influence on their electrochemical properties, the conventional HF-etching method limits the surface functional groups to —F, —OH, and —O. In this study, O-free, Cl-terminated MXenes (noted as Ti3C2Clx) are first synthesized by a molten salt (FeCl2) etching route. Then, a substitution of surface termination from Cl— to N— is performed via post-thermal treatment of Ti3C2Clx in Li3N containing molten salt electrolytes. While the Cl-terminated pristine material does not show electrochemical activity, the surface-modified, N-containing Ti3C2Tx exhibits a unique capacitive-like electrochemical signature in sulfuric acid aqueous electrolyte with rate performance—more than 300 F g-1 (84 mAh g-1) at 2 V s-1. These results show that control of the MXene surface chemistry enables the preparation of high-performance electrodes in a previously not accessed limit of energy storage.

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Sprache(n): eng - English
 Datum: 2022-11-232023
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1002/aenm.202202709
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Titel: Advanced Energy Materials
  Kurztitel : Adv. Energy Mater.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Weinheim : Wiley-VCH
Seiten: - Band / Heft: 13 (2) Artikelnummer: 2202709 Start- / Endseite: - Identifikator: ISSN: 1614-6832