Titanium Carbide MXene Shows an Electrochemical Anomaly in Water-in-Salt Electrolytes

Xuehang Wang; Tyler S. Mathis; Yangyunli Sun; Wan Yu Tsai; Netanel Shpigel; Hui Shao; Danzhen Zhang; Kanit Hantanasirisakul; Fyodor Malchik; Nina Balke; De En Jiang; Patrice Simon; Yury Gogotsi

doi:10.1021/acsnano.1c06027

Titanium Carbide MXene Shows an Electrochemical Anomaly in Water-in-Salt Electrolytes

Xuehang Wang, Tyler S. Mathis, Yangyunli Sun, Wan Yu Tsai, Netanel Shpigel, Hui Shao, Danzhen Zhang, Kanit Hantanasirisakul, Fyodor Malchik, Nina Balke, De En Jiang, Patrice Simon, Yury Gogotsi

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

80 Scopus citations

Abstract

Identifying and understanding charge storage mechanisms is important for advancing energy storage. Well-separated peaks in cyclic voltammograms (CVs) are considered key indicators of diffusion-controlled electrochemical processes with distinct Faradaic charge transfer. Herein, we report on an electrochemical system with separated CV peaks, accompanied by surface-controlled partial charge transfer, in 2D Ti3C2Tx MXene in water-in-salt electrolytes. The process involves the insertion/desertion of desolvation-free cations, leading to an abrupt change of the interlayer spacing between MXene sheets. This unusual behavior increases charge storage at positive potentials, thereby increasing the amount of energy stored. This also demonstrates opportunities for the development of high-rate aqueous energy storage devices and electrochemical actuators using safe and inexpensive aqueous electrolytes.

Original language	English
Pages (from-to)	15274-15284
Number of pages	11
Journal	ACS Nano
Volume	15
Issue number	9
DOIs	https://doi.org/10.1021/acsnano.1c06027
State	Published - 28 Sep 2021

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.

Funding

This research was sponsored by the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science and Office of Basic Energy Sciences. Operando AFM measurements were carried out and supported at the Center for Nanophase Materials Sciences (CNMS) in Oak Ridge National Laboratory, which is a DOE Office of Science user facility. This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. The authors also acknowledge K. Li, C.E. Shuck and J. Tang (all, Drexel University) for assistance with SEM, ex-situ XRD, and Raman analyses.

Funders	Funder number
U.S. Department of Energy	DE-AC02-05CH11231
Office of Science
Basic Energy Sciences

Keywords

abnormal electrochemical behavior
charge storage mechanism
desolvation-free cation insertion
partial charge transfer
titanium carbide MXene
water-in-salt electrolytes

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10.1021/acsnano.1c06027

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abstract = "Identifying and understanding charge storage mechanisms is important for advancing energy storage. Well-separated peaks in cyclic voltammograms (CVs) are considered key indicators of diffusion-controlled electrochemical processes with distinct Faradaic charge transfer. Herein, we report on an electrochemical system with separated CV peaks, accompanied by surface-controlled partial charge transfer, in 2D Ti3C2Tx MXene in water-in-salt electrolytes. The process involves the insertion/desertion of desolvation-free cations, leading to an abrupt change of the interlayer spacing between MXene sheets. This unusual behavior increases charge storage at positive potentials, thereby increasing the amount of energy stored. This also demonstrates opportunities for the development of high-rate aqueous energy storage devices and electrochemical actuators using safe and inexpensive aqueous electrolytes.",

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AU - Shao, Hui

AU - Zhang, Danzhen

AU - Hantanasirisakul, Kanit

AU - Malchik, Fyodor

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Titanium Carbide MXene Shows an Electrochemical Anomaly in Water-in-Salt Electrolytes

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Keywords

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