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Journal ArticleDOI

Structure, morphology and electrical transport properties of the Ti3AlC2 materials

TL;DR: In this paper, a study of Ti3AlC2 materials prepared with Self-Propagating High-Temperature Synthesis (SHS) method followed by uniaxial hot pressing (HP) is presented.
About: This article is published in Ceramics International.The article was published on 2018-10-15. It has received 22 citations till now. The article focuses on the topics: Residual resistivity & Magnetoresistance.
Citations
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Journal ArticleDOI
TL;DR: In situ construction of two-dimensional (2D)/2D pg-C3N4/Ti3AlC2 MAX heterojunction using a protonated assisted sonication approach, while TiO2 nanoparticles were embedded over the laye... as discussed by the authors.
Abstract: In situ construction of two-dimensional (2D)/2D pg-C3N4/Ti3AlC2 MAX heterojunction was achieved using a protonated assisted sonication approach, while TiO2 nanoparticles were embedded over the laye...

59 citations

Journal ArticleDOI
TL;DR: In this article, a two-dimensional (2D)/2D heterostructure of oxygen-defective OV-Ti3AlC2 MAX with proton-rich functionalized carbon nitride (f-C3N4) was fabricated for photocatalytic CO2 conversion into energy-rich solar fuels, CH4, in the presence of H2O/H2 under visible light.
Abstract: A novel two-dimensional (2D)/2D heterostructure of oxygen-defective OV-Ti3AlC2 MAX with proton-rich functionalized carbon nitride (f-C3N4) was fabricated for photocatalytic CO2 conversion into energy-rich solar fuels, CH4, in the presence of H2O/H2 under visible light. During CO2 photoreduction with H2O over f-C3N4, CO was produced rapidly; however, incorporating OV-Ti3AlC2, selective CH4 evolution was observed. The CH4 yield rate up to 786 μmol g cat-1 h-1 was achieved via photodriven CO2 hydrogenation over the composite catalyst, which are 13- A nd 15-fold higher than Ti3AlC2 and graphitic carbon nitride (g-C3N4) catalysts, respectively. This superior performance confirms the higher electrical conductivity and efficient interfacial charge transfer due to dual mediators with oxygen clusters. Thermodynamic analysis reveals that both CO and H2 intermediates greatly contribute to boosting CH4 generation, while the highest energy is consumed during water splitting. In other words, H2 is necessary for CO2 hydrogenation, which can be injected directly or can be produced by water splitting. The optimized H2/CO2 feed ratio of 2.0 further confirmed the adsorption competition of reactants before converting to CH4. Cyclic experiments show the highest catalytic reactivity with durability for continuous CH4 production without obvious deactivation. With the OV-Ti3AlC2 MAX framework structure, significant opportunities exist in terms of improved catalyst reactivity for single-step CO2 methanation to solar fuels.

41 citations

Journal ArticleDOI
Ni Xue1, Xuesong Li1, Mengqi Zhang1, liuyuan han1, Yangyang Liu1, Xutang Tao1 
28 Sep 2020
TL;DR: In this article, the authors proposed a method to use fluorine-based reagents for energy storage in the preparation of MXenes and showed that the high toxicity of fluorine containing reagents is the bot...
Abstract: MXenes exhibit great promise for energy storage. Fluorine-based reagents have always been the mainstream of MXenes preparation. However, the high toxicity of fluorine-containing reagents is the bot...

34 citations

Journal ArticleDOI
TL;DR: In this paper, the microstructure and dielectric properties of Ti3AlC2-polyimide percolating composites were investigated in detail, and a simple and effective strategy for regulating negative permittivity was provided.
Abstract: With the rapid development of metamaterials, percolating composites with negative dielectric constant have become a research hotspot in recent years. In this work, Ti3AlC2-polyimide percolating composites were prepared by mechanical mixing and pressure forming, and their microstructure and dielectric properties were investigated in detail. By controlling the Ti3AlC2 content, an electrical percolation phenomenon appears with the formation of Ti3AlC2 conductive network. The conductive mechanism changed from hoping conduction to metal-like conduction. Above the percolation threshold (68%–72%), real permittivity changes from positive to negative and mainly due to the damped motion of the free electrons. The Drude model analysis showed that the negative permittivity resulted from the plasma-like oscillation of free electrons. The equivalent circuit analysis indicated that the generation of negative permittivity was closely related to the appearance of inductance. This work provided a simple and effective strategy for regulating negative permittivity and promoted its application.

26 citations

References
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TL;DR: In this paper, a structure refinement method was described which does not use integrated neutron powder intensities, single or overlapping, but employs directly the profile intensities obtained from step-scanning measurements of the powder diagram.
Abstract: A structure refinement method is described which does not use integrated neutron powder intensities, single or overlapping, but employs directly the profile intensities obtained from step-scanning measurements of the powder diagram. Nuclear as well as magnetic structures can be refined, the latter only when their magnetic unit cell is equal to, or a multiple of, the nuclear cell. The least-squares refinement procedure allows, with a simple code, the introduction of linear or quadratic constraints between the parameters.

14,360 citations

Journal ArticleDOI
TL;DR: XCrySDen is presented, a crystalline- and molecular-structure visualisation program, which aims at display of isosurfaces and contours, which can be superimposed on crystalline structures and interactively rotated and manipulated.

1,599 citations

Journal ArticleDOI
TL;DR: In this paper, the pole-density profile of axially symmetric flat-plate or capillary specimens, composed of effectively rod- or disk-shaped crystallites, can be corrected for preferred orientation with a single pole density profile, and a convenient procedure is to approximate this profile with a function whose variable parameters are fit during least squares structure refinement.
Abstract: Diffracted intensities from axially symmetric flat-plate or capillary specimens, composed of effectively rod- or disk-shaped crystallites, can be corrected for preferred orientation with a single pole-density profile. A convenient procedure is to approximate this profile with a function whose variable parameters are fit during least-squares structure refinement. Several functions have previously been suggested but without theoretical justification. The present study reviews the derivation of this method and examines its assumptions and applications. The several proposed functions are compared with each other and with the March function which describes the pole-density distribution produced by rigid-body rotation of inequant crystallites (i.e. crystallites with unequal sides) upon axially symmetric volume-conserving compression or expansion. For its basis, ease of use, single variable parameter, direct interpretability and good refinement test results, the March distribution is proposed as an advantageous pole-density profile function for general use.

1,489 citations

Journal ArticleDOI
TL;DR: A critical review of the M(n + 1)AX(n) phases from a materials science perspective is given in this article, where the authors discuss the potential for low-temperature synthesis, which is essential for deposition of MAX phases onto technologically important substrates.

905 citations