Recent advances in 2D MXenes: preparation, intercalation and applications in flexible devices

Xu, Jinxin; Peng, Ting; Qin, Xin; Zhang, Qi; Liu, Tianyi; Dai, Wubin; Chen, Bing; Yu, Huangzhong; Shi, Shengwei

doi:10.1039/d1ta03070a

Cited by 115 publications

(57 citation statements)

References 139 publications

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“…In the past few years, 2D materials including graphene (GR), transition metal dichalcogenides, and black phosphorous have been used in photovoltaic field for enhancing the device PCE and stability due to their considerable optoelectrical properties. [10,11] GR has been used to modify the SnO 2 ETL for the fabrication of PVSCs with PCE of 20.2% by improving interfacial electron extraction efficiency and suppressing interfacial charge recombination. [12] The 2D SnS 2 and TiS 2 nanosheets have been developed as ETLs in PVSCs and the corresponding device achieved PCE of 13.63% and 17.37% with substantial stability.…”

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confidence: 99%

Amino‐Functionalized Niobium‐Carbide MXene Serving as Electron Transport Layer and Perovskite Additive for the Preparation of High‐Performance and Stable Methylammonium‐Free Perovskite Solar Cells

Zhang

Huang

Sun

et al. 2022

Adv Funct Materials

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Perovskite solar cells have shown great potential in commercial applicationsdue to their high performance and easy fabrication. However, the electron transport layer (ETL) materials with good optoelectrical properties and energy levels matching that of the perovskite layer still need to be explored to meet the need of commercialization. In this work, 2D Nb 2 CT x MXene nanosheets are prepared and their work function (WF) is reduced from 4.65 to 4.32 eV to match the conduction band minimum of perovskite layer by replacing the surface -F groups with NH 2 groups through hydrazine (N 2 H 4 ) treatment. Besides, the N 2 H 4 treated (T-Nb 2 CT x ) MXene nanosheets with abundant NH 2 groups are incorporated into the perovskite precursor to retard the crystallization rate by forming hydrogen bond with iodine ions, which promotes the formation of high-quality and oriented growth perovskite films. Consequently, the PVSCs with T-Nb 2 CT x MXene ETLs and T-Nb 2 CT x MXene nanosheets additive exhibit the highest power conversion efficiency (PCE) of 21.79% and the corresponding flexible and large-area devices achieve the highest PCE of 19.15% and 18.31%. Meanwhile, the unencapsulated devices maintain 93% of the original PCEs after 1500 h of storage. This work demonstrates the considerable application prospects of 2D Nb 2 CT x MXene in photoelectric devices.

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confidence: 99%

Amino‐Functionalized Niobium‐Carbide MXene Serving as Electron Transport Layer and Perovskite Additive for the Preparation of High‐Performance and Stable Methylammonium‐Free Perovskite Solar Cells

Zhang

Huang

Sun

et al. 2022

Adv Funct Materials

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“…While the IPA molecule is intercalated, it boils at the local temperature, and bubbles are formed. These bubbles then expand, which further helps loosen interlayer coupling, giving rise to exfoliation. , Enhanced interaction between the material and the solvent in which it is sonicated helps exfoliation. Moreover, it results in large sheet dimensions and few layers.…”

Section: Resultsmentioning

confidence: 99%

Freestanding Silver-Doped Zinc Oxide 2D Crystals Synthesized by a Surface Energy-Controlled Hydrothermal Strategy

Pradhan

Bandyopadhyay

Nayak

et al. 2021

ACS Appl. Nano Mater.

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Two-dimensional transition metal oxides (2DTMOs) are in great demand for electronic gadgets and sensing devices due to their flexibility, structural immunity, and economic cost. Silver-doped 2DTMOs have suitable candidature for wavelength-selective photoresistive switching; therefore, band-gap engineering in 2DTMOs via silver doping is crucial. We report our discovery via hydrothermal synthesis of Ag-doped 2D ZnO (AZO) using an equimolar concentration of zinc nitrate (Zn(NO 3 ) 2 •6H 2 O) and silver nitrate (AgNO 3 ) as precursors and hexamethylenetetramine (HMTA) as a reducing agent, which helps to optimize surface energy for 2D crystal growth. Monolayers and a few-layered atomically thin AZO sheets up to 3 μm lateral dimensions are formed, as evidenced from atomic force microscopy line profiling. High-resolution electron imaging suggests the emergence of hexagonal (six-fold), square lattice (four-fold), and numerous other strainmediated crystallographic phases of AZO. X-ray photoelectron spectroscopy demonstrates tunable (up to ∼20%) Ag doping resulting in midgaps opening at 1.8 and 2.8 eV. Apart from the successful demonstration of the synthesis of 2D AZO atomic sheets and their thorough characterizations, unique electronic, optical, optoelectronic, photoluminescence, and ferromagnetic behavior paves the way for future generations of emergent devices and sensors.

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“…MXene (Ti 3 C 2 T x ) nanosheets, as a member of 2D transition metal carbides, own extraordinary conductivity, abundant adjustable functional groups (OH, O, or F) and unique layered structure, [ 28–31 ] which are frequently employed as active material or conductive substrate to construct nanocomposite electrodes. [ 32 ] Furthermore, MXene also possesses a foundation for anticorrosion (high strength, modulus, and chemical stability).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the power and energy trade-off of LIBs restricts the thickness of artificial passivation layer. [27] Naturally, designing a suitable Al current collector is challenging and meaningful.MXene (Ti 3 C 2 T x ) nanosheets, as a member of 2D transition metal carbides, own extraordinary conductivity, abundant adjustable functional groups (OH, O, or F) and unique layered structure, [28][29][30][31] which are frequently employed as active material or conductive substrate to construct nanocomposite electrodes. [32] Furthermore, MXene also possesses a foundation for anticorrosion (high strength, modulus, and chemical stability).…”

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MXene‐Ti₃C₂ Armored Layer for Aluminum Current Collector Enable Stable High‐Voltage Lithium‐Ion Battery

Yang

et al. 2022

Adv Materials Inter

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considerable electrochemical stability, which is ascribed to the natural passivation layer Al 2 O 3 . [10] The Al 2 O 3 layer could availably prevent Al from corrosion in an ideal state (absence of water, voltage <4.0 V versus Li/Li + approximately). [11][12][13] Obviously, it is hardly to achieve an anhydrous environment and corresponding strategies are adopted to deal with the aluminum oxidation after passivation layer breakdown. Modulating electrolyte composition is effective, including additives, [14,15] superconcentrated electrolytes [16,17] or new lithium salts [18,19] and solvents. [20,21] And recently, the modification of Al current collector has gradually attracted scientific attention, such as in situ chemical conversion [22,23] or passivation layer assembly. [24][25][26] An advanced artificial passivation layer we anticipate should simultaneously resist corrosion and conduct electricity. In addition, the power and energy trade-off of LIBs restricts the thickness of artificial passivation layer. [27] Naturally, designing a suitable Al current collector is challenging and meaningful.MXene (Ti 3 C 2 T x ) nanosheets, as a member of 2D transition metal carbides, own extraordinary conductivity, abundant adjustable functional groups (OH, O, or F) and unique layered structure, [28][29][30][31] which are frequently employed as active material or conductive substrate to construct nanocomposite electrodes. [32] Furthermore, MXene also possesses a foundation for anticorrosion (high strength, modulus, and chemical stability). In inorganic system, MXene is requisitioned as a combined physical barrier enhancer to metal protection. [33][34][35] Consequently, the better electrochemical stability of MXene in organic environment makes it an innovative perspective to protect Al current collector solely in high-voltage LIBs. Herein, for the first time, an MXene armored layer was fabricated on pure Al current collector (MXene-Al) via a simple self-assembly procedure, which is homogeneous and ultrathin (<100 nm), protecting Al matrix in LiPF 6 -carbonates electrolyte without compromising conductivity. In Li||LiCo 1/3 Ni 1/3 Mn 1/3 O 2 (NCM333) system with a high cut-off voltage of 4.5 V, cells with MXene-Al possess an enhanced electrochemical performance. The discharge capacity retention reaches up to 81.4% after 300 cycles at 0.5 C, while that of pristine Al is only 21%. The self-discharge propensity is alleviative and rate/power performance is improved. Elevating operating voltage (above 4.5 V) is a consequential approach to increasing the energy density of lithium-ion batteries (LIBs). Unfortunately, the corrosion of cathode aluminum (Al) current collector at high voltage limits the application of high-voltage LIBs. In this report, for the first time, MXene-Ti 3 C 2 T x nanosheets are proposed as an armored layer for Al current collector to conquer the corrosion under high operating voltage over 4.5 V versus Li + /Li. The MXene armored layer is fabricated via a self-assembly procedure, which exhibits ultra-thinness le...

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Recent advances in 2D MXenes: preparation, intercalation and applications in flexible devices

Abstract: Due to their distinctive two-dimensional (2D) structure and excellent properties, MXenes have got much attention and developed very fast since their discovery in 2011. Generally, 2D MXenes are prepared by...

Cited by 115 publications

References 139 publications

Amino‐Functionalized Niobium‐Carbide MXene Serving as Electron Transport Layer and Perovskite Additive for the Preparation of High‐Performance and Stable Methylammonium‐Free Perovskite Solar Cells

Amino‐Functionalized Niobium‐Carbide MXene Serving as Electron Transport Layer and Perovskite Additive for the Preparation of High‐Performance and Stable Methylammonium‐Free Perovskite Solar Cells

Freestanding Silver-Doped Zinc Oxide 2D Crystals Synthesized by a Surface Energy-Controlled Hydrothermal Strategy

MXene‐Ti₃C₂ Armored Layer for Aluminum Current Collector Enable Stable High‐Voltage Lithium‐Ion Battery

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Recent advances in 2D MXenes: preparation, intercalation and applications in flexible devices

Abstract: Due to their distinctive two-dimensional (2D) structure and excellent properties, MXenes have got much attention and developed very fast since their discovery in 2011. Generally, 2D MXenes are prepared by...

Cited by 115 publications

References 139 publications

Amino‐Functionalized Niobium‐Carbide MXene Serving as Electron Transport Layer and Perovskite Additive for the Preparation of High‐Performance and Stable Methylammonium‐Free Perovskite Solar Cells

Amino‐Functionalized Niobium‐Carbide MXene Serving as Electron Transport Layer and Perovskite Additive for the Preparation of High‐Performance and Stable Methylammonium‐Free Perovskite Solar Cells

Freestanding Silver-Doped Zinc Oxide 2D Crystals Synthesized by a Surface Energy-Controlled Hydrothermal Strategy

MXene‐Ti3C2 Armored Layer for Aluminum Current Collector Enable Stable High‐Voltage Lithium‐Ion Battery

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MXene‐Ti₃C₂ Armored Layer for Aluminum Current Collector Enable Stable High‐Voltage Lithium‐Ion Battery