Ultra-efficient electromagnetic wave absorption with ethanol-thermally treated two-dimensional Nb2CTx nanosheets

Jin, Zhaoyong; Fang, Yanfeng; Wang, Xiaoxia; Xu, Gengfang; Liu, Mengli; Wei, Shuang; Zhou, Congli; Zhang, Yanlin; Xu, Yuanhong

doi:10.1016/j.jcis.2018.11.034

Cited by 74 publications

(31 citation statements)

References 62 publications

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“…As shown in the survey XPS spectrum (Figure S6, Supporting Information), the two samples showed the same elements peaks at 285, 455, 531, and 685 eV, which were ascribed to C 1s, Ti 2p, O 1s and F 1s, respectively. [ 35,36,38 ] In addition, Ti 3 C 2 T x MXene and Ti 3 C 2 OH QDs have almost the same surface functional bonds in the narrow scan spectra of C1s, Ti 2p and O 1s (Figure 2I and Figure S7; Table S3, Supporting Information). The Ti‐C bond could be observed in the C 1s and Ti 2p spectrum of Ti 3 C 2 T x MXene and Ti 3 C 2 OH QDs, which again indicates that the main configuration of Ti 3 C 2 T x MXene was maintained during the preparation of Ti 3 C 2 OH QDs.…”

Section: Figurementioning

confidence: 97%

“…The FTIR spectra was shown in Figure 2H, Ti 3 C 2 T x MXene and Ti 3 C 2 OH QDs have identical stretching vibrations at about 620, 1650, and 3420 cm −1 , which are attributed to TiC, CO, and OH bonds, respectively. [ 35,36 ] However, it should be noticed that the disappearance of CF bond at 1100 cm −1 and the increase of OH bond deformation vibration at 1395 cm −1 was occurred to the Ti 3 C 2 OH QDs. [ 11,37 ] This result suggest that the F groups of the prepared QDs surface was replaced by the OH ones upon being stirred in the NaOH solution.…”

Section: Figurementioning

confidence: 99%

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Rational Design of Hydroxyl‐Rich Ti₃C₂T_x MXene Quantum Dots for High‐Performance Electrochemical N₂ Reduction

Jin

Liu

et al. 2020

Advanced Energy Materials

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177

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Ammonia (NH 3 ) is essential to human life due to its vital roles in fuel production, agricultural cultivation and industrial manufacture. [1,2] The abundant nitrogen (N 2 ) in the earth's atmosphere is the main raw material for the synthesis of NH 3 , [3] but the large bond energy (940.95 kJ mol −1 ) of NN bond [1,4] makes N 2 reduction reaction (NRR) extremely difficult. [5] At present, the traditionally industrial NH 3 synthesis strongly relies on the Haber-Bosch process, which has to be conducted at high pressures at 200-300 atm and high temperature of ≈500 °C. [6] Furthermore, such production method is energy-intensive that consumes 1-3% of the global energy annually and emit tons of CO 2 correspondingly. [7] Over the last decades, electrochemical NRR has attracted global attention due to its renewable raw materials of N 2 and water as well as ambient synthesis condition. [8] With recent booming development, the study of NRR electrocatalysts has moved from precious metals to cheap and abundant transition metal oxides and metal-free materials, etc. [9] However, due to the lack of rational and target-specific design of the NRR electrocatalyst, it is still a difficult task to reach an ideal electrocatalyst fulfilling with the requirements of high NH 3 yield, excellent selectivity and cost-effectiveness simultaneously. To meet these requirements, it is expected that catalysts contain abundant active sites. [10] Under this context, various low-dimensional catalysts have been extensively investigated, such as 2D nanosheets and 0D quantum dots (QDs) due to their ultrahigh ratio of active sites and defects exposed on the surfaces.QDs, especially derived from 2D materials (2D-QDs), are often with small size of less than 10 nm, enhanced surface defects and large surface specific area, thus offering abundantactive basal and edge sites, together with various functional groups. [8,11,12] As a result, a large space has been generated for advanced rational design for N 2 adsorption and full reduction. [13,17] So far, however, the effect of edge sites and their functional groups on NRR performance of 2D-QDs is poorly known. MXene, an emerging typical 2D material, can be expressed by the chemical formula of M n+1 X n T x (n = 1, 2 and 3), [18,20] where M stands for the transition metal (e.g., Ti, Ta, Nb, V, Mo), the X represents the nitrogen or carbon or carbonitride, while T x represents a large number of surface functional groups (e.g., OH, F). [21,22] Due to the excellent conductivity and stability, To enable an efficient and cost-effective electrocatalytic N 2 reduction reaction (NRR) the development of an electrocatalyst with a high NH 3 yield and good selectivity is required. In this work, Ti 3 C 2 T x MXene-derived quantum dots (Ti 3 C 2 T x QDs) with abundant active sites enable the development of efficient NRR electrocatalysts. Given surface functional groups play a key role on the electrocatalytic performance, density functional theory calculations are first conducted, clarifying that hydroxyl groups on Ti 3 C 2...

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Section: Figurementioning

confidence: 97%

Section: Figurementioning

confidence: 99%

Rational Design of Hydroxyl‐Rich Ti₃C₂T_x MXene Quantum Dots for High‐Performance Electrochemical N₂ Reduction

Jin

Liu

et al. 2020

Advanced Energy Materials

Self Cite

177

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“…[ 22 ] The SEAD of the E‐etched MXene sample is illustrated in Figure 2c. The diffraction rings demonstrate (421), (100), (102), and (201) planes of the Nb 2 CT x crystal, [ 22,39 ] which are indicated by the calculated d ‐spacing of 0.21, 0.35, 0.181, and 0.128 nm, respectively. These patterns are coherent with PDF card #15‐0127 for hexagonal phase Nb 2 C of a space group of P63/mmc.…”

Section: Figurementioning

confidence: 99%

Efficient Energy Conversion and Storage Based on Robust Fluoride‐Free Self‐Assembled 1D Niobium Carbide in 3D Nanowire Network

Pang

Wong

et al. 2020

Advanced Science

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2D materials have drawn tremendous attention and extensive investigations for emerging applications in energy, electronics, and optoelectronics have been conducted. [1,2] In particular, 2D transition metal carbides and nitrides (MXenes) are considered as emerging energy materials. Enjoying their endowments in the high hydrophilic surface, porosity, and conductivity, MXenes possess widespread applications in battery, electrocatalyst, supercapacitor, and biochemistry. [3][4][5][6][7] MXenes are usually described by a chemical formula of M n+1 X n T x (n = 1, 2, and 3), where M represents an early transition metal (such as Ti, Nb, Cr, and V.), X stands for the C and/or N element, and T x is the

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“…The interplanar spacings of 0.271 and 0.273 nm are clearly observed, which are corresponding to (200) and (002) planes of Bi 2 WO 6 , respectively, [143] while the lattice spacing of 0.271 nm is assigned to (042) plane of Nb 2 CT x (Figure 7j). [61,72] Other examples, such as 2D MXene Ti 3 C 2 T x /2D MoSe 2 nanosheet heterostructures, [144] 2D MXene Ti 3 C 2 T x /2D FePS 3 nanosheet heterostructures, [73] 2D MXene Ti 3 C 2 T x /2D n-Si nanosheet heterostructures, [145] and 2D MXene Mo 2 CT x /2D MoS 2 nanosheet heterostructures, [146] were rationally designed for exploration of superior performances of 2D MXene-based devices.…”

Section: D Mxene/2d Nanosheet Heterostructuresmentioning

confidence: 99%

Recent Advances in Functional 2D MXene‐Based Nanostructures for Next‐Generation Devices

Huang

Tang

et al. 2020

Adv Funct Materials

268

138

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Similar to graphene and black phosphorus (BP), 2D transition metal carbides and nitrides (MXenes) are of great interest in a variety of fields, such as energy storage and conversion, sensors, electromagnetic interference (EMI) shielding, and photothermal therapy due to their excellent conductivity and hydrophilicity, large specific capacitance, high photothermal effect, and superior electrochemical performance. To further broaden applicable ranges beyond their existing boundaries and fully exploit these potentials, functional 2D MXene nanostructures in recent years have been rationally designed and developed by various approaches, such as doping strategies, surface functionalization, and hybridization, for next-generation devices with the merits of low power consumption, intelligence, and high-integration chips. This review provides an overview of the synthetic routes and fundamental properties of functional 2D MXene nanostructures, including surfacemodified 2D MXenes and mixed-dimensional MXene-based heterostructures, highlights the state-of-the-art progress in the applications of functional 2D MXene nanostructures with regard to energy storage and conversion, catalysis, sensors, photodetectors, EMI shielding, degradation, and biomedical applications, and presents the challenges and perspectives in these burgeoning fields. It is hoped that this review will inspire more efforts toward fundamental research on new functional 2D MXene-based devices to satisfy the growing requirements for next-generation systems.

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Ultra-efficient electromagnetic wave absorption with ethanol-thermally treated two-dimensional Nb2CTx nanosheets

Cited by 74 publications

References 62 publications

Rational Design of Hydroxyl‐Rich Ti₃C₂T_x MXene Quantum Dots for High‐Performance Electrochemical N₂ Reduction

Rational Design of Hydroxyl‐Rich Ti₃C₂T_x MXene Quantum Dots for High‐Performance Electrochemical N₂ Reduction

Efficient Energy Conversion and Storage Based on Robust Fluoride‐Free Self‐Assembled 1D Niobium Carbide in 3D Nanowire Network

Recent Advances in Functional 2D MXene‐Based Nanostructures for Next‐Generation Devices

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Ultra-efficient electromagnetic wave absorption with ethanol-thermally treated two-dimensional Nb2CTx nanosheets

Cited by 74 publications

References 62 publications

Rational Design of Hydroxyl‐Rich Ti3C2Tx MXene Quantum Dots for High‐Performance Electrochemical N2 Reduction

Rational Design of Hydroxyl‐Rich Ti3C2Tx MXene Quantum Dots for High‐Performance Electrochemical N2 Reduction

Efficient Energy Conversion and Storage Based on Robust Fluoride‐Free Self‐Assembled 1D Niobium Carbide in 3D Nanowire Network

Recent Advances in Functional 2D MXene‐Based Nanostructures for Next‐Generation Devices

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Product

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Rational Design of Hydroxyl‐Rich Ti₃C₂T_x MXene Quantum Dots for High‐Performance Electrochemical N₂ Reduction

Rational Design of Hydroxyl‐Rich Ti₃C₂T_x MXene Quantum Dots for High‐Performance Electrochemical N₂ Reduction