Enhanced supercapacitive performance of Mo1.33C MXene based asymmetric supercapacitors in lithium chloride electrolyte

El Ghazaly, Ahmed (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

Zheng, Wei (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

Halim, Joseph (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

Tseng, Eric Nestor (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

Persson, Per O Å (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

Ahmed, Bilal (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

Rosén, Johanna (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

(creator_code:org_t)

Elsevier, 2021
2021
English.
In: Energy Storage Materials. - : Elsevier. - 2405-8289 .- 2405-8297. ; 41, s. 203-208

Related links:: https://liu.diva-por... (primary) (Raw object); show more...; https://doi.org/10.1...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

Two-dimensional (2D) Mo1.33C MXene renders great potential for energy storage applications and is mainly studied in the sulfuric acid (H2SO4) electrolyte. However, H2SO4 limits the electrode potential to 0.9 V for symmetric devices and 1.3 V for asymmetric devices. Herein, we explore the electrochemical behavior of Mo1.33C MXene in LiCl electrolyte. In comparison to H2SO4, LiCl electrolyte is a neutral salt with high solubility at room temperature and low hazardousness. The analysis shows a volumetric capacitance of 815 Fcm(-3) at a scan rate of 2 mVs(-1) with a large operating potential window of -1.2 to +0.3V (vs. Ag/AgCl). This is further exploited to construct MXene-based asymmetric supercapacitors Mo1.33C//MnxOn, and the electrochemical performance is evaluated in 5M LiCl electrolyte. Owing to the wide voltage widow of the Mo1.33C//MnxOn devices (2V) and high packing density of the electrodes, we have achieved a volumetric energy density of 58 mWh/cm(3), a maximum power density of 31 Wcm(-3) and retained 92% of the initial capacitance after 10,000 charge/discharge cycles at 10 A g(-1). One of the main value propositions of this work, aside from the high energy density, is the outstanding columbic efficiency (100%), which ensures excellent cyclic stability and is highly desirable for practical applications.

By the author/editor: El Ghazaly, Ahme ...; Zheng, Wei; Halim, Joseph; Tseng, Eric Nest ...; Persson, Per O Å; Ahmed, Bilal; show more...; Rosén, Johanna; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Other Physics To ...

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