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

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

doi:10.1021/acsnano.1c06027

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

Journal Article · 20 August 2021 · ACS Nano

DOI: https://doi.org/10.1021/acsnano.1c06027 · OSTI ID:1827045

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^[1]; Sun, Yangyunli ^[2];

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^[4]; Shao, Hui ^[5]; Zhang, Danzhen ^[1]; Hantanasirisakul, Kanit ^[1]; Malchik, Fyodor ^[6];

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Drexel Univ., Philadelphia, PA (United States). A. J. Drexel Nanomaterials Inst.
Univ. of California, Riverside, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Bar-Ilan Univ., Ramat Gan (Israel)
Université Toulouse III Paul Sabatier, Toulouse (France). Centre Inter-Universitaire de Recherche et d'Ingénierie des Matériaux (CIRIMAT)
Bar-Ilan Univ., Ramat Gan (Israel); al-Farabi Kazakh National University, Almaty (Kazakhstan)

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 Ti₃C₂T_x 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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1827045

Journal Information:: ACS Nano, Journal Name: ACS Nano Journal Issue: 9 Vol. 15; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
abnormal electrochemical behavior
charge storage mechanism
desolvation-free cation insertion
partial charge transfer
titanium carbide MXene
water-in-salt electrolytes

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

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