10.1021/acs.chemmater.9b01334.s001
Kijae Kim
Kijae
Kim
Yasunobu Ando
Yasunobu
Ando
Akira Sugahara
Akira
Sugahara
Seongjae Ko
Seongjae
Ko
Yuki Yamada
Yuki
Yamada
Minoru Otani
Minoru
Otani
Masashi Okubo
Masashi
Okubo
Atsuo Yamada
Atsuo
Yamada
Dense Charge Accumulation in MXene with a Hydrate-Melt
Electrolyte
American Chemical Society
2019
Hydrate-Melt Electrolyte Electrochemical double-layer
Dense Charge Accumulation
large-capacitance MXene Ti 2 CT x
Aqueous EDL capacitors show
supercapacitor
hydrate-melt electrolyte
Li
titanium carbide MXene electrode
electrochemical window
electrochemical energy storage devices
2019-06-11 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Dense_Charge_Accumulation_in_MXene_with_a_Hydrate-Melt_Electrolyte/8313920
Electrochemical
double-layer (EDL) capacitors operating at high
charge/discharge rates are an important class of electrochemical energy
storage devices. Aqueous EDL capacitors show great potential for use
as inexpensive devices with much higher power; however, their energy
density is severely limited by the narrow electrochemical window of
water (1.23 V) and the small specific capacity of the electrodes.
Here, we develop a high-voltage aqueous supercapacitor based on a
highly concentrated Li<sup>+</sup> aqueous electrolyte (hydrate melt)
and a two-dimensional titanium carbide MXene electrode. Experimental
and theoretical analyses reveal the existence of dense hydrated Li<sup>+</sup> in the interlayer space of the deeply charged MXene, which
is realized by the wide electrochemical window of a hydrate-melt electrolyte.
The hydrate-melt electrolyte together with the large-capacitance MXene
Ti<sub>2</sub>CT<sub><i>x</i></sub> improves the performance
of an aqueous lithium-ion supercapacitor, offering a promising strategy
for advanced aqueous capacitors.