Few-layered Ti3C2Tx MXene synthesized via water-free etching toward high-performance supercapacitors

Siqi Gong; Fan Zhao; Yaning Zhang; Huiting Xu; Meng Li; Junjie Qi; Honghai Wang; Zhiying Wang; Yuqi Hu; Xiaobin Fan; Wenchao Peng; Chunli Li; Jiapeng Liu

doi:10.1016/j.jcis.2022.11.063

Few-layered Ti₃C₂T_x MXene synthesized via water-free etching toward high-performance supercapacitors

J Colloid Interface Sci. 2023 Feb 15;632(Pt A):216-222. doi: 10.1016/j.jcis.2022.11.063. Epub 2022 Nov 17.

Authors

Siqi Gong¹, Fan Zhao¹, Yaning Zhang¹, Huiting Xu¹, Meng Li¹, Junjie Qi¹, Honghai Wang¹, Zhiying Wang¹, Yuqi Hu¹, Xiaobin Fan², Wenchao Peng², Chunli Li³, Jiapeng Liu⁴

Affiliations

¹ School of Chemical Engineering and Technology, National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China.
² School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China.
³ School of Chemical Engineering and Technology, National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China. Electronic address: lichunli_hebut@126.com.
⁴ School of Chemical Engineering and Technology, National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China. Electronic address: liujiapeng@hebut.edu.cn.

PMID: 36413946
DOI: 10.1016/j.jcis.2022.11.063

Abstract

MXene has drawn considerable attention in energy storage due to particular physicochemical properties. At present, among most near-ambient temperature preparation methods, water is usually served as the main solvent. However, MXene is usually subjected to fast structural degradation on account of water molecules attacking in aqueous solution. Herein, we report a novel water-free etching strategy for synthesizing few-layered Ti₃C₂T_x MXenes in deep eutectic solvents at near-ambient temperature. Benefitting from the absence of water and macromolecular structure of deep eutectic solvents, the as-synthesized few-layered Ti₃C₂T_x (DES-Ti₃C₂T_x) MXene presents abundant -O terminations and low oxidation degree. As a consequence, the DES-Ti₃C₂T_x MXene displays excellent specific capacitance of 320 F/g at 2 mV/s. Impressively, the DES-Ti₃C₂T_x MXene exhibits splendid long-term stability that 97% specific capacitance retention can be acquired over 50 000 cycles at high current density of 50 A/g. Therefore, this study offers a new thought for preparing high performance MXene-based materials by water-free etching method.

Keywords: Deep eutectic solvents; MXene; Pseudocapacitance; Terminations; Water-free etching.