INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Xiaobao Zhang,Baiyi Shao,Zemin Sun,Zhe Gao,Yong Qin,Ce Zhang,Fangming Cui,Xiaojing Yang
Nobel metal Pt composites show high catalytic activity for hydrogen evolution reaction (HER) but limited in application by high Pt contents and therefore the cost. Herein, a series of Pt nanoparticle (NP)-deposited 2D Ti3C2Tx MXenes were prepared by an atomic layer deposition (ALD) method with relatively low Pt contents (0.98–3.10 wt %) and showed excellent HER catalytic activity and stability. The electrochemical results indicated that the prepared catalysts showed the optimal HER activity as the ALD deposition cycle reached 40, with an overpotential of 67.8 mV approaching that of the commercial Pt/C catalyst (64.2 mV). The excellent behavior was attributed to the homogeneous dispersion of the Pt NPs and the good conductivity of the 2D Ti3C2Tx MXene supports.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2022
·Vol. 12
·期 12
·2022
·
IF 2.695
Buxiang Wang,Qing Shu,Haodong Chen,Xuyao Xing,Qiong Wu,Li Zhang
It remains a formidable challenge to prepare an economical and stable electrocatalyst for hydrogen evolution reaction using non-precious metals. In this study, MXene (Ti3C2Tx) nanosheets were prepared by high-energy ultrasound treatment, and Cu nanoparticles were prepared by NaBH4as a reducing agent. Then, the electrocatalyst Cu/Ti3C2Tx, suitable for hydrogen evolution reaction (HER), was prepared by supporting Cu with Ti3C2Tx. The structure, morphology, crystal phase and valence state of the obtained catalyst were determined by a variety of characterization analysis methods, and the influence of these properties on the catalytic performance is discussed here. The results of Brunner–Emmet–Teller (BET) showed that Ti3C2Txcan effectively inhibit Cu agglomeration. Results of Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD) showed that Cu has metallic and oxidized states. X-ray Photoelectron Spectroscopy (XPS) further revealed the existence of multivalent states in Cu, which would contribute to the formation of electron transfer channels and the enhancement of electrocatalytic activity. In addition, the Cu/Ti3C2Txcatalyst has strong hydrophilicity, as measured by contact angle, which is conducive to HER. Ti3C2Txhas acceptable electrocatalytic hydrogen evolution performance: under alkaline conditions, when the current density is 10 mA cm−2, HER overpotential is as low as 128 mV and the Tafel slope is as low as 126 mV dec−1. Meanwhile, Ti3C2Txshowed adequate stability for HER (94.0% of the initial mass activity after 1000 CV cycles). This work offers insights into the development of high-performance non-precious metal-based catalysts to achieve the high performance of HER in alkaline electrolytes.Keywords:hydrogen evolution reaction;electrocatalyst;Cu;MXene (Ti3C2Tx) nanosheets
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·11202-11214
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IF 4.682
Liu Linxiang,Zhang Jiaqi,Shi Ge,Zhang Huili,Wang Bing,Zhong Linxin
Recently, wearable electronic devices and human–computer interaction are developing prosperously, which expands the requirement of flexible sensing materials. Graphene and its derivatives with extraordinary advantages are highly attractive precursors. However, it is difficult to assemble graphene into macroscopic cubes with good fatigue resistance performance. Here, we propose an efficient way to manufacture a lamellar-structural rGO aerogel with enhanced stiffness and deflection of lamellae, by using MXene as a rigidity additive. The addition of MXene (Ti 3 C 2 T x ) improves the mechanical and fatigue resistance properties of the aerogel, making it super compressible and elastic. The highly stable structure of the aerogel can withstand extremely high compressive strain of 90% and long-term compression at 50% strain for at least 10,000 cycles. The lamellar structure makes a great contribution to achieve good sensing performance including high linear sensitivity, low testing limit, wide testing strain range and quick response. These features make the MXene/rGO aerogel a promising sensing material for flexible wearable devices to monitor the subtle and obvious biosignals of the human body movement. Graphical abstract
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Weiyi Cai,Wenwa Weng,Nigel Graham,Xun Liu,Wenzheng Yu,Kening Sun,Ting Liu
MXene (Ti 3 C 2 Tx) can be utilized to modify water-related membranes to provide favorable properties, including pronounced hydrophilicity and chemical stability, and higher flux compared with GO membranes. In order to improve the properties of composite membrane properties, new methods of modifying MXene membranes have been receiving increasing attention. Nowadays, the performance of MXene membranes is mainly limited by methods of modification and stability. In this study, a high-performance composite membrane utilizing MXene (Ti 3 C 2 T x ) was fabricated through a mild and rapid pre-oxidation method. The composite membrane had a high water permeability of ∼690 L m −2 h −1 MPa −1 , a dye rejection of ∼99.9 % and an adsorption rate of only 1 %. Compared with the unoxidized MXene membranes, the composite membranes showed improved the permeation inhibition efficiencies of 42.39 % and 37.51 % for NaCl and MgCl 2 , respectively. The rapid oxidation by Fe(III) formed a composite nano-layer of anatase TiO 2 and magnetite Fe 3 O 4 supported by carbon sheets which protected the internal Ti 3 C 2 T x from further oxidation. The characteristic morphology of a two-dimensional, layer by layer material, was maintained. In addition, the composite membrane demonstrated long-term stability in terms of both structure/appearance and flux in water. Therefore, this work presents new thoughts on the structural tuning and performance optimization of MXene (Ti 3 C 2 T x ) membranes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 23
·14319-14327
·
IF 10.733
Xiaoqiao Fan,Lu Liu,Xin Jin,Wentao Wang,Shufen Zhang,Bingtao Tang
The latent heat storage of PCMs has gained increasing attention in the solar energy application field due to their high thermal energy storage density. However, the lack of energy conversion ability of the organic PCMs results in the low utilization efficiency of solar energy. Herein, we report a novel PEG/Ti3C2Tx layered composite PCM with superior photothermal storage capability, which consists of stacked Ti3C2Tx nanosheets and PEG filled within the spaces between the flakes. The resulting composites exhibited a strong absorption capacity for electromagnetic waves at the UV-Vis-NIR region. Notably, there are two enhanced absorption bands at the visible and near-infrared regions due to the localized surface plasmon resonance (LSPR) effect of the Ti3C2Tx nanosheets, which endows the composite PCM with excellent photo-to-thermal storage efficiencies (up to 94.5%) under actual solar light irradiation. In addition, the composite PCM also possesses a high energy storage density and form-stable property before and after the phase transition. These results indicate that the synthesized composite presents superior comprehensive properties suitable for solar energy storage applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
S. Jiang,H. Zhang,Z. Li,L. Chen,L. Yin,X. Liu
Non-invasive sweat detectors can monitor the glucose level of diabetes in a painless way. However, most detectors need to collect enough sweat through external exercise or active stimulation, which increases the inconvenience of the user and reduces the applicable population. In this study, we propose an ultra-sensitive biomimetic glucose detector to detect the sweat produced by thermoregulation without additional exercise and stimulation. Inspired by the predator process of sponge in the sea, the sensing material of MXene (Ti 3 C 2 T x ) @CeO 2 hydrogels employed the “laminae-trestle-laminae” (L-T-L) structure of sponge to adsorb and transport glucose molecules in sweat. CeO 2 grafted onto the MXene surface can detect glucose by the catalytic activity of CeO 2 . The glucose detector with an ultra-low limit of detection (LOD = 0.004 μM), excellent sensitivity (801.27 μA⋅μM − 1 ⋅cm − 2 ), and a broad linear detection range (LDR = 0.01–2.5 μM) can satisfy detection requirements in human sweat after dilution. In real applications, the detector can detect glucose in the sweat of diabetic patients for five consecutive days and detect the glucose content in the daily drinks of patients. Our findings demonstrate the high potential of sponge-inspired MXene@CeO 2 glucose detector for routine medical testing.
研究领域:
生物医学工程
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材料科学
·
医学检测
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Kaiyu Liu,Hongwei Zhang,Yutong Qin,Chuntao Lan,Hao Jia
Developing high-performance electromagnetic interference (EMI) shielding materials with robust microwave attenuation capabilities and structural stability remains a formidable challenge to enhance their practical adaptability in everyday scenarios. In this study, we have successfully fabricated a gradient structured MXene-based composite film tailored for high-performance EMI shielding. Initially, a hybrid MoS 2 @MXene material featuring heterointerfaces is synthesized, which exhibits exceptional electromagnetic wave (EMW) absorption capabilities. Subsequently, a gradient structured multi-layer film is engineered using a layer-by-layer casting approach, gradually increasing the MXene content in the MoS 2 @MXene/MXene/aramid nanofiber composite. This composite film is purposefully designed to employ an “absorb-reflect-reabsorb” EMI shielding mechanism, resulting in reduced reflection power. The resultant composite film achieves an impressive EMI SE of 50.9 dB, coupled with remarkable structural stability persisting through 500 folding cycles. This study presents a viable and potent strategy for developing flexible, absorption-dominant EMI shielding materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yixin Hou,Shiyuan Chen,Pengfei Ma,Ke Mao,Junjie Shi,Fei Long,Jun Su,Yanan Ma,Yihua Gao
Replacing Zn metal with intercalated materials as the aqueous zinc-ion batteries (AZIBs) anode is an effective strategy to solve serious zinc dendrites problem. MXene-based derived materials combine the advantages of both derivatives with excellent electrochemical activity and MXene with high electrical conductivity . Here, we report an in situ derived strategy for synthesizing H 2 Ti 3 O 7 −MXene from common Ti 3 C 2 MXene by one-step hydrothermal process with simultaneous alkalization and oxidation , followed by ion-exchange reaction. It is experimentally verified that H 2 Ti 3 O 7 −MXene exhibits an extremely low charging voltage of only 0.25 V, which has a satisfactory potential for AZIBs anodes. Through characterization analyses, H 2 Ti 3 O 7 −MXene nanoflowers consist of countless connectively interlaced and entangled nanoribbons , which shorten the ion diffusion path and accelerate Zn 2+ diffusion kinetics. The synergistic effect between H 2 Ti 3 O 7 and MXene enables H 2 Ti 3 O 7 −MXene to achieve efficient and reversible Zn 2+ (de)intercalation. Specifically, at 0.10 A g −1 , the specific capacity of 61.20 mAh g −1 is achieved and no significant discharge specific capacity decline occurs at 0.60−2.00 A g −1 . The assembled zinc ion full-cell (Zn x MnO 2 //H 2 Ti 3 O 7 −MXene) shows the excellent cyclic stability and good coulombic efficiency during 600 GCD cycles. This work proves the feasibility of MXene-based derivatives for AZIBs anode and sheds light on developing efficient intercalated MXene derived anodes.
研究领域:
材料科学
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电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 36
·2401733
·
IF 27.4
Xin Wang,Xiaoming Chen,Qingyuan He,Yaozu Hui,Chaofan Xu,Baichuan Wang,Feihu Shan,Jie Zhang,Jinyou Shao
To obtain high-performance electromagnetic microwave (EM) absorption materials with broad effective absorption bandwidth ( EAB ) and reduced thickness, designing structures has proved to be a promising way. Herein, ultra-broadband multilayer bidirectional MXene/polyimide EM absorption aerogels containing multi-structures on scales ranging from the micro- to the macroscale are produced with the aid of electric and temperature fields. On the microscale, under the action of electric force and temperature gradient, the ordered structures made of aligned Ti 3 C 2 T x MXene nanosheets and the microscale layered aerogel walls enable the bidirectional aerogel to achieve a wide EAB of 8.58 GHz at a thickness of 2.1 mm. This is ascribed to the numerous aligned nanosheets and layered aerogel walls perpendicular to the incident EMs, facilitating the conversion of electromagnetic energy into electrical energy. Furthermore, on the macroscale, the multilayer bidirectional aerogel with non-gradient structures effectively resolves the conflict between impedance matching and energy loss, resulting in an ultrawide EAB of 9.41 GHz at a thickness of 3 mm. This innovative design of electric-field-assisted multilayer bidirectional aerogels with multiscale structural coupling may provide feasible and effective pathways for the development of advanced EM absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2024
·
IF 10.5
Dong Liu,Jimei Liu,Chong Li,Yanwen Ji,Yuxuan Han,Zhiwei Xue,Quanyong Lv,Jintao Chen,Yongxiao Wang,Hui Li
MXene (Ti 3 C 2 T x ) is an important category of two-dimensional (2D) materials due to its distinctive metallic conductivity and adjustable surface chemistry. The exceptional benefits of heterointerface and defects or viods, combined with the distinct electromagnetic (EM) properties, inject boundless potential into the advancement of MXene-based absorbers for EM absorbing materials. However, conventional synthetic methods depend on chemical etching of MAX powders (Ti 3 AlC 2 ) using hazardous HF or similar substances, resulting in MXene sheets with fluorine termination and limited stability in colloidal dispersions under ambient conditions. Herein, varied synthetic routes were proposed to prepare MXenes with different terminal groups by the fluoride-based salts, fluoride-free molten salts , and alkali etching. 2D MXene nanosheets with abundant surface groups are excellent EM absorbing materials, and the MXene etched by the Lewis acid CuCl 2 delivered remarkable reflection loss ( RL ) value of −47.56 dB at 2.5 mm and broad bandwidth of 4.8 GHz due to promoted interfacial polarization. By conducting a thorough examination of the structural changes in MXenes, this study aims to propose a viable method for delaminating single-layer MXene and elucidate the EM absorption mechanisms.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2022
·Vol. 8
·期 12
·2200620
·
IF 7.633
Guoliang Xiong,Gang Zhang,Xiaozhan Yang,Wenlin Feng
A novel 2D layered material Ti 3 C 2 T x (MXene) is favored by researchers in the application field of optoelectronics due to its tunable work function, great light transmittance, and excellent electrical conductivity. In this work, Ti 3 C 2 T x /n-germanium (MXene/n-Ge) Schottky heterostructures are fabricated and investigated. Schottky contacts of MXene with n-Ge are identified by ultraviolet photoelectron spectroscopy (UPS). Based on the MXene/n-Ge Schottky junctions, an ultrafast, broadband, and self-powered photodetector is demonstrated and studied. The MXene/n-Ge device exhibits excellent photoresponse from ultraviolet to near-infrared light illumination. In particular, it shows an excellent on/off ratio (≈10 4 ), a high responsivity (3.14 A/W), a larger specific detectivity (2.14 × 10 11 Jones), and an ultrafast response speed (t rise of 1.4 µs and t decay of 4.1 µs). Moreover, the MXene/n-Ge Schottky heterostructure photodetector also shows excellent low-temperature work characteristics of 73 K. It is believed that this work will attract more researchers’ attention to MXene in the field of optoelectronic devices.
研究领域:
材料科学
·
光电设备
·
半导体物理
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2021
·
IF 4.051
Yuanbo Tan,Mingjie Yi,Zhenye Zhu,Xueting Zhang,Ke Qin,Jiaheng Zhang,Rongshu Zhu
Herein, a mesh carbon-coated MoSe 2 /Mo 2 CT x hybrid material (MoSe 2 /Mo 2 CT x @C) is proposed as an effective catalyst for electrochemical hydrogen evolution reaction (HER). On one hand, the highly conductive Mo 2 CT x substrate enhanced charge transfer ability and effectively prevented the agglomeration of MoSe 2 nanosheets to expose abundant active sites. On the other hand, the carbon coating layer further improved the conductivity and effectively prevented Mo 2 CT x from being oxidized in the environment. Consequently, the unique MoSe 2 /Mo 2 CT x @C hybrid material exhibited excellent HER performance. Specifically, the MoSe 2 /Mo 2 CT x @C catalyst only required an overpotential of 108.3 mV to reach a current density of 10 mA cm −2 and displayed excellent durability under long-term cycling in acidic solution. This research highlights the potential applications of MXene-based composite materials in the energy field.
研究领域:
材料科学
·
能源化学
✓ 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）