Titanium Carbide MXene Shows an Electrochemical Anomaly in Water-in-Salt Electrolytes - Archive ouverte HAL Access content directly
Journal Articles ACS Nano Year : 2021

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

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.

Dates and versions

hal-03880297 , version 1 (01-12-2022)

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Xuehang Wang, Tyler Mathis, Yangyunli Sun, Wan-Yu Tsai, Netanel Shpigel, et al.. Titanium Carbide MXene Shows an Electrochemical Anomaly in Water-in-Salt Electrolytes. ACS Nano, 2021, 15 (9), pp.15274-15284. ⟨10.1021/acsnano.1c06027⟩. ⟨hal-03880297⟩
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