TY - JOUR
T1 - Advantage of Larger Interlayer Spacing of a Mo2Ti2C3 MXene Free-Standing Film Electrode toward an Excellent Performance Supercapacitor in a Binary Ionic Liquid-Organic Electrolyte
AU - Gandla, Dayakar
AU - Zhang, Fuming
AU - Tan, Daniel Q.
N1 - Publisher Copyright:
© 2022 The Authors. Published by American Chemical Society
PY - 2022/3/1
Y1 - 2022/3/1
N2 - MXenes show outstanding specific capacitance in aqueous electrolytes. However, the narrow potential window of aqueous electrolytes restrains the energy density. Ionic liquid electrolytes can provide a higher potential window and superior specific energy but are subject to slow ion transport and difficult intercalation for their larger ion size. It is desirable to explore larger interlayer-spaced (d-spaced) MXenes that can facilitate the large ion intercalation-deintercalation process. This work reports the first-ever supercapacitor application of the Mo2Ti2C3 MXene free-standing film electrode (f-Mo2Ti2C3) using 1 M 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide (EMIMTFSI) in acetonitrile electrolyte. Without any preintercalating agents, the authors achieved an interlayer spacing of ∼2.4 nm in the f-Mo2Ti2C3 material through etching, followed by a vacuum-assisted filtration technique. The microstructure, electrochemical properties, and charge storage kinetics of the f-Mo2Ti2C3 outperform the conventional f-Ti3C2Tx. The f-Mo2Ti2C3-based symmetric two-electrode device exhibited remarkable specific energy and specific power of 188 Wh kg-1 and 22 kW kg-1, respectively, along with a high specific capacitance of 152 F g-1. This larger d-spaced f-Mo2Ti2C3 can emerge as a better alternative to the conventional f-Ti3C2Tx in ionic liquid electrolytes to design next-generation high-performance MXene supercapacitors.
AB - MXenes show outstanding specific capacitance in aqueous electrolytes. However, the narrow potential window of aqueous electrolytes restrains the energy density. Ionic liquid electrolytes can provide a higher potential window and superior specific energy but are subject to slow ion transport and difficult intercalation for their larger ion size. It is desirable to explore larger interlayer-spaced (d-spaced) MXenes that can facilitate the large ion intercalation-deintercalation process. This work reports the first-ever supercapacitor application of the Mo2Ti2C3 MXene free-standing film electrode (f-Mo2Ti2C3) using 1 M 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide (EMIMTFSI) in acetonitrile electrolyte. Without any preintercalating agents, the authors achieved an interlayer spacing of ∼2.4 nm in the f-Mo2Ti2C3 material through etching, followed by a vacuum-assisted filtration technique. The microstructure, electrochemical properties, and charge storage kinetics of the f-Mo2Ti2C3 outperform the conventional f-Ti3C2Tx. The f-Mo2Ti2C3-based symmetric two-electrode device exhibited remarkable specific energy and specific power of 188 Wh kg-1 and 22 kW kg-1, respectively, along with a high specific capacitance of 152 F g-1. This larger d-spaced f-Mo2Ti2C3 can emerge as a better alternative to the conventional f-Ti3C2Tx in ionic liquid electrolytes to design next-generation high-performance MXene supercapacitors.
UR - http://www.scopus.com/inward/record.url?scp=85125401412&partnerID=8YFLogxK
U2 - 10.1021/acsomega.1c06761
DO - 10.1021/acsomega.1c06761
M3 - 文章
AN - SCOPUS:85125401412
SN - 2470-1343
VL - 7
SP - 7190
EP - 7198
JO - ACS Omega
JF - ACS Omega
IS - 8
ER -