Journal
ACS NANO
Volume 15, Issue 4, Pages 7821-7832Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c02271
Keywords
MXene; flake orientation; 2D ionic transport channels; ionic cross-linking; smart fiber
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Funding
- National Natural Science Foundation of China [52003188]
- start-up research grant for a distinguished professor at Soochow University
- Natural Science Foundation of Jiangsu Province [BK2020043448]
- open research project of the Jiangsu Province Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies
- open research fund State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University [KF2104]
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MXenes are highly conductive 2D materials with electrochemical storage features, and oriented Ti3C2Tx fibers exhibit excellent volumetric capacitive charge storage capability and mechanical strength. The wet spinning process can improve the electronic conductivity and morphology of the fibers, making them ideal for applications in electrochemical energy storage, biosensors, and potentially biocompatible fibrillar tissues.
MXenes are an emerging class of highly conductive two-dimensional ( 2D) materials with electrochemical storage features. Oriented macroscopic Ti3C2Tx fibers can be fabricated from a colloidal 2D nematic phase dispersion. The layered conductive Ti3C2Tx fibers are ideal candidates for constructing high-speed ionic transport channels to enhance the electrochemical capacitive charge storage performance. In this work, we assemble Ti3C2Tx fibers with a high degree of flake orientation by a wet spinning process with controlled spinning speeds and morphology of the spinneret. In addition to the effects of cross-linking of magnesium ions between Ti3C2Tx flakes, the electronic conductivity and mechanical strength of the as-prepared fibers have been improved to 7200 S cm(-1) and 118 MPa, respectively. The oriented Ti3C2Tx fibers present a volumetric capacitive charge storage capability of up to 1360 F cm(-3) even in a Mg-ion based neutral electrolyte, with contributions from both nanofluidic ion transport and Mg-ion intercalation pseudocapacitance. The oriented 2D Ti3C2Tx driven nanofluidic channels with great electronic conductivity and mechanical strength endows the MXene fibers with attributes for serving as conductive ionic cables and active materials for fiber-type capacitive electrochemical energy storage, biosensors, and potentially biocompatible fibrillar tissues.
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