Synthesis of High-Quality Two-Dimensional V 2 C MXene for Supercapacitor Application

Wangsheng Ai, Chunfei Zhang, Lan Xia, He Miao and Jinliang Yuan
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Wangsheng Ai: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315832, China
Chunfei Zhang: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315832, China
Lan Xia: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315832, China
He Miao: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315832, China
Jinliang Yuan: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315832, China

Energies, 2022, vol. 15, issue 10, 1-12

Abstract: Two-dimensional (2D) V 2 C MXene has fascinating potential for use as electrodes in high-energy-density supercapacitors because of its excellent electrical conductivity and large specific surface area. However, it is not feasible to synthesize V 2 C by etching vanadium carbon aluminide (V 2 AlC) with hydrofluoric acid, which is commonly used for preparing other MXenes. In this work, a modified method is developed for synthesizing high-quality 2D V 2 C. A mixture of sodium fluoride (NaF) and hydrochloric acid (HCl) was used as the etching agent, where V 2 AlC can be gently etched by a hydrothermal reactor-assisted method. As electrode materials for supercapacitors, V 2 C shows the characteristics of electric double layer capacitance. The electrochemical results show high specific capacitance (223.5 F/g in 1 M Na 2 SO 4 at a current density of 100 mA/g) and good cycling stability (the capacitance retention rate can be maintained at 94.7% after 5000 cycles). This work provides a new method for the synthesis of high-quality V 2 C for application in related fields.

Keywords: V 2 C; supercapacitors; MXene; specific capacitance; cycling stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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