Electrochemical Behavior of Vanadium Carbide in Neutral Aqueous Electrolytes

doi:10.1088/0256-307X/38/5/058201

Chin. Phys. Lett.

2021, Vol. 38

Issue (5): 058201 DOI: 10.1088/0256-307X/38/5/058201

CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY

Electrochemical Behavior of Vanadium Carbide in Neutral Aqueous Electrolytes

Chaofan Chen¹, Di Pang¹, Xiaotong Wang¹, Gang Chen^1,2, Fei Du^1,2*, and Yu Gao^1*

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

Cite this article:

Chaofan Chen, Di Pang, Xiaotong Wang et al 2021 Chin. Phys. Lett. 38 058201

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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.

Received: 10 January 2021 Published: 02 May 2021

Fund: Supported by the Science & Technology Department of Jilin Province (Grant Nos. 20180101199JC and 20180101204JC), and Jilin Province/Jilin University Co-construction Project-Funds for New Materials (SXGJSF2017-3).

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https://cpl.iphy.ac.cn/10.1088/0256-307X/38/5/058201 OR https://cpl.iphy.ac.cn/Y2021/V38/I5/058201

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	Chaofan Chen
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	Gang Chen
	Fei Du
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