TY - JOUR
T1 - Titanium Carbide MXene Shows an Electrochemical Anomaly in Water-in-Salt Electrolytes
AU - Wang, Xuehang
AU - Mathis, Tyler S.
AU - Sun, Yangyunli
AU - Tsai, Wan Yu
AU - Shpigel, Netanel
AU - Shao, Hui
AU - Zhang, Danzhen
AU - Hantanasirisakul, Kanit
AU - Malchik, Fyodor
AU - Balke, Nina
AU - Jiang, De En
AU - Simon, Patrice
AU - Gogotsi, Yury
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/9/28
Y1 - 2021/9/28
N2 - 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.
AB - 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.
KW - abnormal electrochemical behavior
KW - charge storage mechanism
KW - desolvation-free cation insertion
KW - partial charge transfer
KW - titanium carbide MXene
KW - water-in-salt electrolytes
UR - http://www.scopus.com/inward/record.url?scp=85114394984&partnerID=8YFLogxK
U2 - 10.1021/acsnano.1c06027
DO - 10.1021/acsnano.1c06027
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C2 - 34415730
AN - SCOPUS:85114394984
SN - 1936-0851
VL - 15
SP - 15274
EP - 15284
JO - ACS Nano
JF - ACS Nano
IS - 9
ER -