Ultrafast Ion Transport in 2D Confined MXene for Improved Electrochemical Performance: Boron-Atom-Substituted -OH Termination.
basic_science · Level V
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- Record sourced from PubMed, PMID 39552425.
- Also identified by DOI 10.1021/acsnano.4c12874.
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Abstract
Regulating the surface termination of a confined space to achieve ultrafast ion transport remains an ongoing challenge. Two-dimensional (2D) MXenes possess adjustable structures and interlayer spacing, which provide an ideal platform for in-depth investigation of ion transport in 2D confined space; however, the strong interaction of the negatively charged terminations in MXenes hinders the transport of intercalated cations. In this work, we proposed a strategy that precisely regulates the surface modification of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene with the weak polarity of boron atoms (SCB-MXene) via the distinct effect of supercritical CO<sub>2</sub>. This not only could effectively substitute -OH termination in MXene but also can prevent the loss of -O active sites, and then, both ultrafast ion transport and high volumetric capacitance can be achieved simultaneously. Ideally, a volumetric capacitance up to 742.7 C cm<sup>-3</sup> at 1000 mV s<sup>-1</sup> for the SCB-MXene film as pseudocapacitive materials that provides an energy density of 66.3 Wh L<sup>-1</sup> even at an ultrahigh power density of 132.5 kW L<sup>-1</sup> is obtained, which is a prominent record of energy density and power density reported up to now. Subsequently, it can be used in large-scale energy storage and conversion devices.