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Ti3−yNbyC2Tx MXenes as high-rate and ultra-stable electrode materials for supercapacitors

Wang, Qiang ; Zhang, Xiao ; Chen, Zhipeng ; Zhao, Yuxin ; Yao, Wei ; Xu, Jianguang

Journal of alloys and compounds, 2023-09, Vol.954, Article 170128 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Ti3−yNbyC2Tx MXenes as high-rate and ultra-stable electrode materials for supercapacitors
  • Autor: Wang, Qiang ; Zhang, Xiao ; Chen, Zhipeng ; Zhao, Yuxin ; Yao, Wei ; Xu, Jianguang
  • Assuntos: MXenes ; Solid Solution ; Supercapacitor ; Surface Chemistry ; Ti3−yNbyC2Tx ; Ultra-stability
  • É parte de: Journal of alloys and compounds, 2023-09, Vol.954, Article 170128
  • Descrição: Despite being a promising supercapacitor electrode material, the development of Ti3C2Tx has still been limited by many obstacles, such as restacking Ti3C2Tx nanosheets and non-electrochemically active fluorine terminations on the surface. Herein, new double transition metal Ti3−yNbyC2Tx MXenes are prepared by etching Ti3−yNbyAlC2 solid solution MAX precursors obtained by self-propagating high-temperature synthesis method for the first time. The synthesized Ti3−yNbyC2Tx MXenes exhibit larger interlayer spacing and more surface -O terminations than Ti3C2Tx, resulting in superior rate performance and high cycling stability as supercapacitors electrode materials. In particular, Ti2.9Nb0.1C2Tx demonstrates a high volumetric specific capacity of 1014 F cm−3 at a scan rate of 2 mV s−1, superior rate performance with a volumetric specific capacity of 422 F cm−3 at a scan rate of 2000 mV s−1, and ultra-long cycling life up to 84000 cycles at a current density of 10 A g−1. This work expands the practical applicability of the MXenes family in energy storage applications and provides a promising strategy to tailor the MXenes interlayer structure and surface chemistry. [Display omitted] •Ti3−yNbyAlC2 solid solution MAX compounds were successfully synthesized by SHS.•New Ti3−yNbyC2Tx MXenes were obtained via etching Ti3−yNbyAlC2 for the first time.•Ti2.9Nb0.1C2Tx delivers an ultrahigh capacitance of 1014 F cm−3 at 2 mV s−1.•Ti2.9Nb0.1C2Tx provides a high capacity retention (41.7%) at 2000 mV s−1.•Ti2.9Nb0.1C2Tx exhibits an ultra-long cycling life up to 84000 cycles at 10 A g−1.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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