Electrochemical Behavior of Vanadium Carbide in Neutral Aqueous Electrolytes
Chaofan Chen1, Di Pang1, Xiaotong Wang1, Gang Chen1,2, Fei Du1,2*, and Yu Gao1*
1Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China 2State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
Abstract：The V$_{2}$C compound, belonging to the group of two-dimensional transition metal carbonitrides, or MXenes, has demonstrated a promising electrochemical performance in capacitor applications in acidic electrolytes; however, there is evidence to suggest that V$_{2}$C is unstable in an acidic environment. On the other hand, the performance of V$_{2}$C in neutral aqueous electrolytes is still moderate, and has not yet been systematically studied. The charge storage mechanism in a V$_{2}$C electrode, employed in neutral aqueous electrolytes, is investigated via cyclic voltammetry testing and in situ x-ray diffraction (XRD). Good specific capacitances are achieved, specifically 208 F/g in 0.5 M Li$_{2}$SO$_{4}$, 225 F/g in 1 M MgSO$_{4}$, 120 F/g in 1M Na$_{2}$SO$_{4}$, and 104 F/g in 0.5 M K$_{2}$SO$_{4}$. Using in situ XRD, we observe that, during the charge and discharge process, the $c$-lattice parameter shrinks or expands by up to 0.25 Å in MgSO$_{4}$, and 0.29 Å in Li$_{2}$SO$_{4}$ which demonstrates the intercalation/de-intercalation of cations into the $d$-V$_{2}$C layer.
收稿日期: 2021-01-10
出版日期: 2021-05-02
引用本文:
. [J]. 中国物理快报, 2021, 38(5): 58201-.
Chaofan Chen, Di Pang, Xiaotong Wang, Gang Chen, Fei Du, and Yu Gao. Electrochemical Behavior of Vanadium Carbide in Neutral Aqueous Electrolytes. Chin. Phys. Lett., 2021, 38(5): 58201-.
2021, Vol. 38 
