Materials Today Sustainability
·
2023
·
IF 7.8
Y. Jia,K. Wang,C. Li,S. Liu
Piezocatalysis, a new catalysis technology much relying on catalyst's piezoelectric property , attracts unprecedented research enthusiasm for applications in energy conversion and chemical synthesis, such as hydrogen peroxide production. However, the reported piezocatalytic activities are not ideal and one of the reasons is the unsatisfactory piezoelectricity , urging researchers to explore new and efficient piezocatalysts. Herein, the MAX phase materials (Ti 3 AlC 2 , Ti 3 AlCN, and Ti 3 SiC 2 ) are employed as piezocatalysts for hydrogen peroxide (H 2 O 2 ) and reactive oxygen species generation. Results suggest that Ti 3 SiC 2 possesses the highest piezocatalytic activity with a notable H 2 O 2 yield of 871.0 μmol/g/h accompanied with small amount of reactive oxygen species, while the Ti 3 AlC 2 and Ti 3 AlCN deliver relatively lower H 2 O 2 yields of 810.6 and 835.6 μmol/g/h in pure water, respectively. A series of characterizations and analysis have been employed to understand the insights of piezocatalytic activity difference and reaction mechanism. The enhanced peizocatalytic activity of Ti 3 SiC 2 can be traced to its notable piezoelectric property and reduced electronic transfer resistance as well as the improved free charge density, all of which are favorable factors benefiting the piezocatalytic H 2 O 2 generation. Moreover, H 2 O 2 production via piezocatalysis stems from both oxygen reduction and water oxidation .
研究领域:
材料科学
·
催化化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Wei Luo,Yi Liu,Chuangye Wang,Dan Zhao,Xiaoyan Yuan,Jianfeng Zhu,Lei Wang,Shouwu Guo
The morphology of MAX phase powders significantly influences their microwave absorption properties. However, the traditional synthesis via solid-state reactions produces irregular powders, and the preparation of MAX phase powders with specific morphology remains a challenge. Herein, (V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC MAX phase microrods were fabricated for the first time in NaCl/KCl molten salts using vanadium, titanium, chromium, aluminum , and short carbon fibers as precursors. It was found that despite acting as a carbon source, carbon fibers also acted as sacrificial templates. By adjusting the molar ratio of metal powders and short carbon fibers, a series of carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with core-sheath structure were also obtained. Carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with a molar ratio of 8:2 showed the optimum microwave absorption performance. The reflection loss (RL) value reached up to –63.26 dB at 2.40 mm, and the effective absorption bandwidth (EAB) was about 5.28 GHz with a thickness of 2.02 mm. Based on the electromagnetic parameter analysis and theoretical simulation, the enhanced microwave absorption performance was attributed to the synergistic effect of different factors like dielectric loss, magnetic loss, multiple reflection, and scattering. This work offers a facile route to modulate the morphology of MAX phase powders and may accelerate its application as microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ming Yan,Jiangtao Huang,Mengliu Yang,Hao Zhang,Yu Zhu,Nengyu Zhou,Juan Wang
MAX phases are layered ternary carbides and nitrides with unique properties, doping transition metals in it is attracting significant attentions for the processing of this relatively new class of materials. In this paper, a magnetic solid solution MAX phase V 2 (Sn 1− x A x )C ( A = Mn, Fe, Co) was synthesized by doping Mn/Fe/Co atoms into V 2 SnC by pressure-less sintering. The XRD results show that when x = 0.4, the characteristic peak shifts to the right, and the substitution reaches saturation. SEM and TEM show that doping does not change the original layered morphology and hexagonal crystal form, but only the lattice constants decrease slightly. Magnetic test results indicate that V 2 (Sn 1− x A x )C is a typical low-temperature magnetic material with a Curie temperature around 60 K, and the magnetization increases with the increase of doping amount. Moreover, we explained the reasons of V 2 SnC doping A-site instead of M-site and the changing trend of the magnetic moments by first-principles calculations, which are consistent with the experimental results.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 10
·3610
·
IF 3.4
Yinan Ren,Zhihua Tian,Yan Zhang,Fushuo Wu,Hao Xie,Qianqian Zhang,Peigen Zhang,Zhengming Sun
ZnO whiskers have many applications, such as in medical and photocatalysis fields. In this study, an unconventional preparation approach is reported, realizing the in-situ growth of ZnO whiskers on Ti2ZnC. The weak bonding between the layer of Ti6C-octahedron and the Zn-atom layers leads to the easy extraction of Zn atoms from Ti2ZnC lattice points, resulting in the formation of ZnO whiskers on the Ti2ZnC surface. This is the first time that ZnO whiskers have been found to grow in-situ on Ti2ZnC substrate. Further, this phenomenon is amplified when the size of the Ti2ZnC grains is mechanically reduced by ball-milling, which bodes a promising route to prepare ZnO in-situ on a large scale. Additionally, this finding can also help us better understand the stability of Ti2ZnC and the whiskering mechanism of MAX phases.Keywords:Ti2ZnC MAX phase;crystal growth;in-situ growth;ZnO whiskers
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2017
·Vol. 7
·期 18
·1700700
·
IF 16.721
Guodong Zou,Jianxin Guo,Xianyu Liu,Qingrui Zhang,Gang Huang,Carlos Fernandez,Qiuming Peng
Sodium-ion batteries are considered alternatives to lithium-ion batteries for energy storage devices due to their competitive cost and source abundance. However, the development of electrode materials with long-term stability and high capacity remains a great challenge. Here, this paper describes for the first time the synthesis of a new class of core–shell MAX@K 2 Ti 8 O 17 by alkaline hydrothermal reaction and hydrogenation of MAX, which grants high sodium ion-intercalation pseudocapacitance. This composite electrode displays extraordinary reversible capacities of 190 mA h g −1 at 200 mA g −1 (0.9 C, theoretical value of ≈219 mA h g −1 ) and 150 mA h g −1 at 1000 mA g −1 (4.6 C). More importantly, a reversible capacity of 75 mA h g −1 at 10 000 mA g −1 (46 C) is retained without any apparent capacity decay even after more than 10 000 cycles. Experimental tests and first-principle calculations confirm that the increase in Ti 3+ on the surface layers of MAX@K 2 Ti 8 O 17 by hydrogenation increases its conductivity in addition to enhancing the sodium-ion intercalation pseudocapacitive process. Furthermore, the distorted dodecahedrons between Ti and O layers not only provide abundant sites for sodium-ion accommodation but also act as wide tunnels for sodium-ion transport.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhihua Tian,Fushuo Wu,Peiying Hu,Jianxiang Ding,Yan Zhang,Peigen Zhang,ZhengMing Sun
The properties of MAX phases can be fine-tuned to meet some particular applications via solid solution route, and the feasible preparation of the MAX solid solutions is a prerequisite for their applications. Ti 3 (Sn x Al 1−x )C 2 solid solutions over the whole composition range (x = 0–1) are synthesized by pressureless sintering, and characterized by XRD and SEM. The composition and crystal structure of representative Ti 3 Sn 0.8 Al 0.2 C 2 are examined by HRTEM, HAADF and EDS associated with STEM, and thus the Sn-rich Ti 3 (Sn x Al 1−x )C 2 solid solution is confirmed. Combined with means of thermal analysis, the reaction path for the formation of the Sn-rich Ti 3 (Sn x Al 1−x )C 2 solid solution is explored. Solid solutions are found to form with TiC as the nucleus and grow by reacting with Ti–Sn/Ti–Al intermetallic compounds . This work proves that the Ti 3 (Sn x Al 1−x )C 2 over the whole composition range, in particular, the Sn-rich end of this series of solid solutions can be obtained by the simple pressureless sintering, and would enable the fine manipulation of the composition of these typical MAX solid solutions for technologically important applications.
研究领域:
材料科学
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 5
·1958-1967
·
IF 3.5
Tang Haifeng,Yan Bingzhen,Zhang Peigen,Yin Xiaodan,Tian Zhihua,Das Mahapatra Susmriti,Zheng Wei,Tang Jingwen,Sun ZhengMing
Micro- and nano-sized one-dimensional (1D) metallic materials exhibit tremendous potential in various technological applications such as flexible and transparent electrodes, sensing, and catalysis. However, achieving eco-friendly and large-scale fabrication of diverse 1D metals remains a formidable challenge. The occurrence of A-site whisker growth from MAX phase presents an opportunity for developing an innovative 1D metal fabrication technique. Herein, we investigate the significant role of oxygen in promoting whisker growth from mechanically damaged Ti 2 SnC MAX phase. Our findings reveal that oxidation of the M-site (titanium) in Ti 2 SnC phases enhances the formation of atomized tin, which plays a crucial role in tin whisker growth. Furthermore, by employing alternative MAX phase precursors, this technique demonstrates the potential to fabricate 1D metals beyond tin. The diverse A-site elements in MAX phases suggest that this approach could serve as a universal strategy for synthesizing various 1D metallic materials. Graphical abstract
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Samira Jabbarvand Behrouz,Alireza Khataee,Vahid Vatanpour,Yasin Orooji
The potential of blended loose nanofiltration membranes (LNMs) to fractionate dyes and inorganic salts in textile wastewater has become a focus of attention in recent years. In this research work, we fabricated LNMs based on polysulfone (PSf) membranes blended with l-histidine amino acid-functionalized Mo2Ga2C MAX phase (His-MAX). Scanning electron microscopy (SEM), atomic force microscopy (AFM), attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), contact angle, ζ-potential, porosity, and pore size analyses were employed to characterize the LNMs. Blending 0.75 wt % of His-MAX additive with the PSf tailored the LNM’s features by making it more water-friendly, increasing its porosity, enlarging its pores, and making its surface smoother. The pure water flux of 127.6 L/m2 h was achieved by LNM containing 0.75 wt % His-MAX, which was 2.5 times greater than the bare one. The mentioned LNM displayed a flux recovery ratio (FRR) of 68.27 and 98.57, 98.31, and 99.7% rejections for Direct red 23, Acid brown 75, and Reactive blue 21 solutions (100 mg/L), respectively. The 0.75 wt % His-MAX LNM could reject 99.1% of dye and 11.5% of salt while maintaining an FRR of 91.19% after four cycles of filtering a binary mixture solution containing Reactive blue 21 and Na2SO4. These findings highlight the potential of the fabricated LNM for desalinating dye solutions.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Matter
·
2024
·
IF 17.3
Youbing Li,Shuairu Zhu,Jia-Bo Le,Jun Lu,Xue Wang,Lu Chen,Haoming Ding,Ke Chen,Mian Li,Shiyu Du,Hui Wang,Runnan Zhang,Per O.Å. Persson,Lars Hultman,Per Eklund,Yongbo Kuang,Zhifang Chai,Qing Huang
M n+1 AX n (MAX) phases have attracted significant attention due to their structural diversity and potential applications. Designing MAX phases with single-atom-thick A layers featuring 4d/5d-orbital electronic elements is interesting work. Here, we present a comprehensive report on noble metal-based M 2 (A 1- x A′ x )C (M = V, Ti, Nb; A = Al, Sn, In, Ga, Ge; A′ = Ru, Rh, Pd, Ir, Pt, Au and combinations thereof; 0 < x ≤ 0.4) phases featuring A sublayers of 4d/5d-orbital electronic elements through an A-site alloying strategy. The chemical composition of MAX phases can be adjusted by selecting different M- and A-site elements, with morphology tailored by distinct C sources. Furthermore, the V 2 (Sn 0.8 Pt 0.2 )C (15.7 wt % Pt) catalyst showed better performance for hydrogen evolution reaction compared to the commercial Pt/C (20 wt % Pt) electrode. This study highlights the prospects of A-site alloying for the design of novel MAX phases with unique properties and promising applications in electrocatalysis and beyond.
研究领域:
材料科学
·
化学工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2022
·
IF 5.572
Ahmet Şenocak,Vildan Sanko,Süreyya Oğuz Tümay,Yasin Orooji,Erhan Demirbas,Yeojoon Yoon,Alireza Khataee
MAX phases have attracted great attention due to unique features such as thermal and electrical conductivity, easy fabrication, heat resistant, and lightweight. In this study, an easy and green method was employed to successfully develop a Ti 3 Al 0.5 Cu 0.5 C 2 MAX phase structure, and a Ti 3 Al 0.5 Cu 0.5 C 2 based glassy carbon electrode (GCE) was applied for the electrochemical determination of rutin antioxidants in mandarin and kiwi samples. The developed Ti 3 Al 0.5 Cu 0.5 C 2 MAX phase was characterized by different techniques such as X-ray photoelectron spectroscopy (XPS), thermogravimetry and differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) to obtain information on the structural and morphological properties. Electrochemical methods such as cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were employed for the determination of rutin using Ti 3 Al 0.5 Cu 0.5 C 2 /GCE. The GCE modified with Ti 3 Al 0.5 Cu 0.5 C 2 demonstrated amplified electrochemical response (ca. 4.25 times) in comparison to the bare GCE towards rutin, and exhibited ultra-sensitivity and selectivity in the presence of other interfering antioxidants. Under the optimum conditions, good linearity in the range of 0.02–50.00 μmol L −1 was obtained for rutin analysis by the Ti 3 Al 0.5 Cu 0.5 C 2 -based sensor with a limit of detection (LOD, 3σ/K) as low as 0.015 μmol L −1 . The fabricated Ti 3 Al 0.5 Cu 0.5 C 2 MAX phase was applied to determine trace levels of rutin in mandarin and kiwi samples with validation by high-performance liquid chromatography (HPLC), thus highlighting its potential for the electrochemical determination of small molecules in the agricultural field.
研究领域:
食品科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 24
·7697-7705
·
IF 7.393
Wei Luo,Yi Liu,Chuangye Wang,Dan Zhao,Xiaoyan Yuan,Lei Wang,Jianfeng Zhu,Shouwu Guo,Xingang Kong
MAX phase solid solutions have attracted considerable attention owing to their unique structure and properties. However, the synthesis of MAX phase solid solutions doped with multi-elements at M-sites still remains a challenge. Herein, a series of (V1−x−yTixCry)2AlC solid solution powders are prepared through the reactions of V, Ti, Cr, and Al metals and graphite in molten NaCl/KCl salts, and their electromagnetic (EM) wave absorption properties are systematically investigated. In comparison with Ti2AlC, V2AlC and Cr2AlC, (V1−x−yTixCry)2AlC solid solutions exhibit prominent EM absorption performance. Specifically, the minimum reflection loss (RL) value of (V0.6Ti0.2Cr0.2)2AlC is −56.2 dB at 12.07 GHz with a sample thickness of 1.75 mm, and the optimized effective absorption bandwidth (EAB, RL < −10 dB) covers the whole X band with 4.16 GHz at 2.00 mm. Furthermore, the strong dielectric resonance is presented in the range of 7–13 GHz for all (V1−x−yTixCry)2AlC, indicating that both dipole polarization and conduction loss contribute to the excellent dielectric loss of doped MAX phases. Theoretical analysis demonstrates that the polarization loss is attributed to the anisotropic conductivity of MAX phases and M-site doping, which further weakens the electric conductivity. As a result, plenty of dipoles are involved and polarization relaxation occurred when the (V1−x−yTixCry)2AlC solutions are radiated by EM. Considering the numerous kinds of MAX phase solid solutions, this work paves the way to study the EM absorption performance of high-entropy or other MAX phase solid solutions.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Small Structures
·
2022
·Vol. 4
·期 1
·2200161
·
IF 11.343
Lu Chen,Youbing Li,Ke Chen,Xiaojing Bai,Mian Li,Shiyu Du,Zhifang Chai,Qing Huang
Entropy stabilization is an effective method to design and explore MAX phases with outstanding properties via tuning constituent elements and crystal structures, which have received considerable critical attention. Currently, some medium-/high-entropy (ME/HE) MAX phases, whose A layers are composed of Al, S, and magnetic elements, are reported, while few discussions about ME/HE-MAX phases with other A elements (e.g., Sn) are conducted. Herein, fully dense ME/HE-MAX phase bulks ((TiVNb) 2 SnC, (TiVNbZr) 2 SnC, and (TiVNbZrHf) 2 SnC) are designed and synthesized because of the chemical diversity of MAX phases. The results of Rietveld refinement of X-ray diffraction, scanning electron microscopy, and high-resolution scanning transmission electron microscopy-affiliated energy-dispersive spectrometer analysis comprehensively verify the crystal structure of ME/HE-MAX phases. Both the electrical conductivity and the charge carrier mobility are significantly lower than the reported correlation ternary MAX phases, due to the electron scattering and structural defects in ME/HE-MAX phase crystal structures. Similarly, the electron contribution of thermal conductivity is gradually declining; on the contrary, the phonon plays an increasingly dominant role as temperature increases. Owing to the richness in composition of MAX phases, herein, a composition design route for discovering new MAX phases and tuning their properties is indicated.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）