Bistacked Titanium Carbide (MXene) Anodes for Hybrid Sodium-Ion Capacitors

By Narendra Kurra, Mohamed Alhabeb, K. Maleski, Chueh-Han Wang, Husam N. Alshareef, Yury Gogotsi. ACS Energy Letters, 2018

163 citations recorded by the source corpus.

Two-dimensional transition-metal carbides (MXenes) have shown great promise as electrode materials for high-rate pseudocapacitive energy storage. In this study, we report on the fabrication of bistacked two-dimensional titanium carbide electrodes which are free of binder, conductive additives, and current-collector. This MXene electrode is capable of reversible electrochemical storage of sodium ions with good cycling stability and rate capability. A prototype hybrid Na-ion capacitor was assembled by combining the bistacked MXene anode with an activated carbon cathode, which showed an energy density of 39 Wh/kg (including the total weight of bistacked MXene and activated carbon, 6 mg/cm2) at 1C rate and maintained up to 60% of its performance at a 60C rate, in the operating voltage window of 3.4 V. This study opens new avenues for developing self-standing binder and additive-free MXene electrodes for metal-ion batteries and capacitors.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/6be5ffcb87fc1bcbae3c4547568c18384e5ba4a4

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Citations in the corpus

2D Ti3C2Tz MXene Synthesized By Water-Free Etching of Ti3AlC2 in Polar Organic Solvents (2020, result): “Since, in delaminated PC-MX, stacking of the layers is weak and random due to which the pseudocapacitive and/or surface redox peaks are smaller in area, compared to reports where multilayered MXene was used.(34,35) Additionally, Lin et al.”
MXetronics: Electronic and photonic applications of MXenes (2019, methodology): “[4] Acid mixture of sulfuric acid and hydrofluoric acid has been reported to minimize etch byproducts such as AlFx.[5] The electrochemical route has been recently explored using binary aqueous electrolyte for high-yield and fluorine-free synthesis of Ti3C2Tx MXene.”
Porous MXenes enable high performance potassium ion capacitors (2019, background): “supercapacitors because of their high electrical conductivity, layered structure, large interlayer spacing, and rich surface/terminal functional groups [18-22].”