Zhao, S; Chen, C; Zhao, X; Chu, X; Du, F; Chen, G; Gogotsi, Y; ... Dall'Agnese, Y; + view all Zhao, S; Chen, C; Zhao, X; Chu, X; Du, F; Chen, G; Gogotsi, Y; Gao, Y; Dall'Agnese, Y; - view fewer (2020) Flexible Nb₄C₃Tₓ Film with Large Interlayer Spacing for High‐Performance Supercapacitors. Advanced Functional Materials , 30 (47) , Article 2000815. 10.1002/adfm.202000815.

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Abstract

MXenes derived from 413 MAX phases are rarely studied but they have the potential to have superior electrical and mechanical properties thanks to a thicker monolayer (four layers of transition metal and three layers of carbon or nitrogen). In this paper, Nb₄C₃Tₓ MXene nanosheets are delaminated and freestanding film with 1.77 nm interlayer spacing is obtained, which is larger than that of most previous MXenes. When Nb₄C₃Tₓ freestanding films are tested as supercapacitors electrodes, Nb₄C₃Tₓ shows high volumetric capacitance, 1075, 687, and 506 F cm^{-3} in 1 M H_{2}SO_{4}, 1 m KOH, and 1 m MgSO_{4}, respectively, at the scan rate of 5 mV s^{−1}. An in situ X‐ray diffraction technique is used to study the structural changes during the electrochemical charging in 1 m H_{2}SO_{4} and 1 M MgSO_{4}. There is almost no change in the 21 Å interlayer spacing during the cycling, because the space between the MXene layers is sufficient to accommodate the insertion and deinsertion of cations. This can lead to stable performance of Nb₄C₃T MXene energy storage devices.

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