Catalysts
·
2025
·Vol. 15
·期 7
·663
·
IF 4
Xiangjie Liu,Xiaomin Chen,Chunlan Huang,Sihan Sun,Ding Yuan,Yuhai Dou
This study addresses the efficiency and cost challenges of hydrogen evolution reaction (HER) catalysts in the context of carbon neutrality strategies by employing a synergistic approach that combines cation vacancy anchoring and transition metal doping on two-dimensional (2D) MXenes. Using an in situ LiF/HCl etching process, the aluminum layers in Ti3AlC2were precisely removed, resulting in a few-layer Ti3C2TxMXene with an increased interlayer spacing of 12.3 Å. Doping with the transition metals Fe, Co, Ni, and Cu demonstrated that Fe@Ti3C2provided the optimal HER performance, characterized by an overpotential (η10) of 81 mV at 10 mA cm−2, a low Tafel slope of 33.03 mV dec−1, and the lowest charge transfer resistance (Rct= 5.6 Ω cm2). Mechanistic investigations revealed that Fe’s 3d6electrons induce an upward shift in the d-band center of MXene, improving hydrogen adsorption free energy and reducing lattice distortion. This research lays a solid foundation for the design of non-precious metal catalysts using MXenes and highlights future avenues in bimetallic synergy and scalability.
研究领域:
材料科学
·
化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Chao Peng,Ping Wei,Xin Chen,Yongli Zhang,Feng Zhu,Yonghai Cao,Hongjuan Wang,Hao Yu,Feng Peng
2D MXenes have attracted extensive attentions owing to their anisotropy, high conductivity and other extraordinary properties. The popular preparation method of MXenes usually involves HF in high concentrations, which has seriously restricted their pervasive applications. In this work, a new hydrothermal route with low-toxicity etching agents (NaBF 4 , HCl) was used to synthesize Ti 3 C 2 MXene ( h- Ti 3 C 2 ). Compared with the Ti 3 C 2 prepared by the traditional HF etching method ( t- Ti 3 C 2 ), the h- Ti 3 C 2 has the higher c lattice parameter , larger interlayer distance and larger BET specific surface area, because of the slow release mechanism during the hydrothermal process. The hydrothermal etching method not only avoided the use of high-concentration HF, but also was more efficient to prepare Ti 3 C 2 flakes. Moreover, the hydrothermal etching route can be extended to other MXene materials, e.g. Nb 2 C. We demonstrated that the h -MXenes have better adsorption performance of methylene blue and methyl orange dyes. The hydrothermal etching route proposed in this study enabled the environmental benign and high efficiency exfoliation of MXenes, displaying the promise to facilely prepare 2D MXenes and paving a way to their widespread applications.
研究领域:
材料科学
·
纳米材料
·
环境功能材料
·
表面化学
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Fei Pan,Lunzhou Yu,Zhen Xiang,Zhicheng Liu,Baiwen Deng,Erbiao Cui,Zhong Shi,Xiang Li,Wei Lu
Although low-dimensional materials have already been studied as attractive electromagnetic wave absorption materials due to unique structure, it is still hard to acquire both ultrathin matching thickness and strong absorbing capability. Herein, multilayer-sandwiched Ti 3 C 2 T x MXene heterostructure decorated with one-dimensional Co nanochains has been synthesized successfully through a facile in situ process. As expected, the EM wave absorbers with ultrathin matching thickness and excellent absorbing capability are realized in the MXene composites. Compared with the MXene/Co nanoparticles , the MXene/Co nanochains composites achieved a minimum reflection loss of −46.48 dB with an ultrathin matching thickness of only 1.02 mm at 16.75 GHz. The intrinsic mechanism of the absorption revealed that the conductive loss, polarization loss, magnetic loss and interlacing magnetic flux field effect contributed to the high-performance microwave absorption. This work not only provided a unique direction for the designing and synthesizing of highly efficient EM wave absorbents with an ultrathin thickness, but also shed additional light on the understanding of the absorbing mechanism.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Haoran Song,Rong Du,Yuwei Wang,Daoyuan Zu,Rui Zhou,Yang Cai,Fangxian Wang,Zhuo Li,Yongming Shen,Changping Li
A simple and general vacancy defects anchoring strategy was developed for the synthesis of single atom metals, which exhibited excellent performance for peroxymonosulfate (PMS) activation. Production of Ti vacancy defects, conversion of metal ions to metal atoms, anchoring of single atom metals and construction of two-dimensional (2D) MXene structure on the eco-friendly Ti 2 AlN ceramic substrate were accomplished in one step using the molten transition metal salts. Complete removal of model pollutants including carbamazepine (CBZ), sulfamethoxazole (SMX) and 2,4-dichlorophen (2,4-DCP) was achieved within less than 2 min in PMS/single atom Co process. Hydroxyl radical ( OH), sulfate radical (SO 4 -) and nonradical oxidation jointly contributed to pollutants degradation. More importantly, the exposed Ti atoms with strong reducibility of MXene substrate triggered the Co(III)/Co(II) cycle and thus accelerated PMS activation. The single atom Co catalyst exhibited excellent performance even under alkaline condition or in actual river water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Zhiquan He,Tengda Rong,Yan Li,Junjie Ma,Quanshui Li,Furong Wu,Yuhang Wang,Fengping Wang
Two-dimensional (2D) MXenes are attractive candidates as surface-enhanced Raman scattering (SERS) substrates because of their metallic conductivity and abundant surface terminations. Herein, we report the facile synthesis of bimetallic solid-solution TiVC (MXene) and its application in SERS. The few-layered MXene nanosheets with high crystallinity were successfully prepared using a one-step chemical etching method without ultrasonic and organic solvent intercalation steps. SERS activity of the as-prepared MXene was investigated by fabricating free-standing TiVC film as the substrate. A SERS enhancement factor of 1012 and femtomolar-level detection limit were confirmed using rhodamine 6G as a model dye with 532 nm excitation. The fluorescent signal of the rhodamine 6G dye was effectively quenched, making the SERS spectrum clearly distinguishable. Furthermore, we demonstrate that the TiVC-analyte system with ultrahigh sensitivity is dominated by the chemical mechanism (CM) based on the experimental and simulation results. The abundant density of states near the Fermi level of the TiVC and the strong interaction between the TiVC and analyte promote the intermolecular charge transfer resonance in the TiVC–analyte complex, resulting in significant Raman enhancement. Additionally, several other probe molecules were used for SERS detection to further verify CM-based selectivity enhancement on the TiVC substrates. This work provides guidance for the facile synthesis of 2D MXene and its application in ultrasensitive SERS detection.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 46
·18688-18697
·
IF 3.5
Xiaolong Lu,Yan Zhou,Cancan Li,Qi Wang,Bijun Fang,Yi Shi,Ningyi Yuan,Jianning Ding
Two-dimensional (2D) transition-metal carbide Ti3C2TX (MXene) possesses good electrical conductivity, high specific surface areas and metal oxide-like surfaces, which make it ideal for application in supercapacitors with both high energy density and power density. However, similar to other 2D materials, the issue of self-stacking leads to narrower ion-transport channels, along with a drastic reduction in active sites, thus severely limiting the performance of MXene-based electrodes. To address this problem, this work proposes to introduce one-dimensional (1D) reduced graphene oxide (rGO) nanoribbons as spacers between MXene nanosheets to construct a composite structure for inhibiting self-stacking. As expected, owing to the steric effect and high aspect ratio of rGO nanoribbons, the fabricated MXene/rGO hybrid electrode, with the addition of 5 wt% graphene oxide (GO), exhibits a greatly improved specific capacitance (397.4 F g−1 at 5 mV s−1) and an unparalleled rate capability (with a capacitance retention of 52.9% at 2000 mV s−1). This work sheds significant light on the development of MXene-based materials for advanced energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 4
·e6364
·
IF 3.1
Ruofan He,Zhenting Yin,Xiaoli Yu,Pengfei Jia,Xiaodong Zhou,Tingting Lu,Liying Guo,Lei Song,Chao Ma,Bibo Wang,Yuan Hu
A kind of rare earth flame retardant, two-dimensional lamellar compounds (MXene) loading with cerium phosphate nanorod, MXene@CePO 4 (CMX) was prepared by hydrothermal and electrostatic adsorption methods. It was then applied in thermoplastic polyurethane (TPU). With the 3 wt% addition of CMX improving the mass rate of residual char from 4.42 wt% to 11.33 wt% compared to pristine TPU, there were reductions of 53.8%, 12.3%, and 24.7% in peak heat release rate (pHRR), total heat release (THR), and smoke density maximum (Ds max), respectively. Moreover, the TPU/CMX composites were shown to have superior mechanical properties compared with pristine TPU. For TPU/CMX-3.0, there was a visible improvement in tensile strength (TS) and elongation at break (EB) of 12.5% and 54.1% respectively, compared to pure TPU. The analysis of the flame retardancy mechanism of TPU/CMX shows that CMX plays an effective role in quenching free radicals in the gas phase and promotes char formation of TPU in the condense phase. Therefore, this paper offers a new solution for designing multifunctional rare earth flame retardants that are applied in TPU, thereby extending its application in industries and daily life.
研究领域:
材料科学
·
高分子化学
·
燃烧与防火安全
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Weitao Shi,Yuanxin Tan,Jiakun Yang,Haizhen Liu,Yi Fan,Jin Guo,Zhiqiang Lan
In this study, we developed a novel FL-V 2 C-MnO 2 composite catalyst via hydrothermal synthesis, achieving the uniform dispersion of nano-scale MnO 2 particles on few-layer V 2 C MXene substrates. Subsequently, the catalytic effects of this composite on the hydrogen storage performance of MgH 2 were systematically investigated. Remarkably, the MgH 2 system modified with 10 wt% FL-V 2 C-MnO 2 demonstrated superior hydrogen storage characteristics. (1) The initial dehydrogenation temperature decreased substantially to 185 °C (39 % reduction compared to pristine MgH 2 ) with room-temperature hydrogen reabsorption capabilities. (2) At 275 °C, the composite achieved 6.3 wt% hydrogen desorption within 780 s, representing 139 %, 130 %, and 185 % improvements over V 2 C-, FL-V 2 C-, and MnO 2 -doped MgH 2 systems, respectively. Notably, this kinetics enhancement corresponded to a 12.6-fold increase compared to undoped MgH 2 at 325 °C. Mechanistic studies revealed that the synergistic interplay between V 2 C and MnO 2 derivatives established multiphase interfaces that significantly accelerated hydrogen sorption kinetics. Specifically, the in-situ formation of MnO during mechanical activation created abundant active sites, while the two-dimensional V 2 C substrate facilitated electron transfer and prevented nanoparticle agglomeration. This multiscale coordination effect between the MXene support and transition metal oxides established new pathways for destabilizing Mg-H bonds and promoting hydrogen dissociation/recombination processes.
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Hongli Zhang,Qiaoqiao Wang,Zhenhao Zhang,Jie Yang,Quanqiang Ren,Hongwei Zhou,Weixing Chen
Membrane-based separation technology is playing a pivotal role in addressing challenges such as sustainable water purification, ion sieving, resource extraction and environmental protection. However, fabricating of the membrane integrates high water permeability, high selectivity and good durability has remained challenging due to the “trade-off” of perm-selectivity. Herein, a gradient membrane structure with gradually decreased layer thickness from the bottom to top surface is designed. The thickness-gradient multilayer structure is constructed by alternating assembly of two-dimensional Ti 3 C 2 T x MXene layer and polyamide (PA) layer. The importing of MXene layer could increase the adsorption of piperazine molecules and improve the interfacial properties of support, which greatly help to optimize the interfacial polymerization reaction-diffusion process and form a more uniform and defect-free PA separating layer. More importantly, the 2D-stacking format of MXene as well as layer-thickness gradient structure substantially reduce hydraulic resistances, promoting water molecules to flow rapidly through the membrane. As a result, the pure water permeability was elevated to ~20.4 L m −2 h −1 bar −1 (nearly 3-folds of the individual PA membrane) and a 97.3 % rejection of Na 2 SO 4 is obtained. Meanwhile, the resultant MXene/PA-2 exhibits outstanding rejection to methyl blue of ~99.9 % and nystatin of ~100.0 %. The membrane also retained 99.5 % of MB rejection and a water permeability of ~18.6 L m −2 h −1 bar −1 after 80 h cross-flow filtration, demonstrating its long-term operation stability. This work provides a rationally structural designing and a promising alternative route of the advanced nanofiltration membranes for high-efficient purification of organic wastewater.
研究领域:
膜科学
·
环境工程
·
材料科学
·
化学工程
·
水净化技术
✓ 已验证
产品关联
DOI
高影响因子
NMR IN BIOMEDICINE
·
2025
·Vol. 38
·期 9
·e70116
·
IF 2.7
Fei-Xiang Hu,Deng-Deng Liu,Xiao-Wen Ma,Pu-Yeh Wu,Wei-Jun Peng,Dan Wang,Tong Tong
This study aims to design and evaluate a two-dimensional Ti 3 C 2 -MXene contrast agent, codoped with iron and manganese, with the aim of achieving T 1 /T 2 dual-mode magnetic resonance imaging contrast, and to investigate its effect on Chemical Exchange Saturation Transfer (CEST) contrast agents. Single-layer Ti 3 C 2 was synthesized via the HCL/LiF etching technique, with the flake size subsequently tailored and the hydroxylated surface modified through a hydrothermal process. Fe 3 O 4 nanoparticles and MnO 2 nanosheets were integrated onto the two-dimensional Ti 3 C 2 -MXene surface using an in situ doping approach, and the final modification was achieved with carboxymethyl chitosan. Various characterization techniques were employed to assess the physical and chemical properties of the probe, which were then combined with a CEST contrast agent to investigate the mechanisms of multimodal magnetic resonance imaging and in vitro photothermal effects. Upon integrating the multi-modal molecular probe with Ioversol for imaging purposes, at a magnetic field strength of B 1 = 1.25 μT and with a molecular probe concentration of 0.5 mg/mL, the CEST signal from Ioversol is almost entirely suppressed. This allows for the successful identification of a distinct concentration range where both contrast agents can coexist. In vitro photothermal studies on MXene codoped with iron and manganese have shown that the composite molecular probe exhibits excellent photothermal efficiency. The method combining complex nanoprobes with CEST contrast agents successfully achieved simultaneous imaging of both contrast agents. In vitro MRI experiments successfully obtained distinguishable concentration ranges for both, with changes in CEST signals reflecting the concentration variations of the complex molecular probes, which also exhibit good photothermal therapy (PTT) capabilities.
研究领域:
纳米材料
·
磁共振成像
·
对比剂
·
多模态成像
·
光热治疗
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 20
·14041-14050
·
IF 3.9
Dongbo Xi,Ruipeng Chen,Shuyue Ren,Zhenhong Jia,Zhixian Gao
In the present study, we address the limitations of conventional surface-enhanced Raman scattering (SERS) techniques for sensitive and stable detection of melamine in food products, especially dairy. To overcome these challenges, we developed a novel SERS-active substrate by incorporating gold nanoparticles (AuNPs) onto carboxyl-functionalized two-dimensional (2D) MXene material doped with nitrides, specifically Au–Ti2N–COOH. Our strategy leverages the unique physicochemical properties of MXene, a class of atomically thin, 2D transition metal carbides/nitrides, with tunable surface functionalities. By modifying the MXene surface with AuNPs and introducing carboxyl groups (–COOH), we successfully enhanced the interaction between the substrate and melamine molecules. The carboxyl groups form hydrogen bonds with the amino groups on the melamine's triazine ring, facilitating the adsorption of melamine molecules within the ‘hotspot’ regions responsible for SERS signal amplification. A series of characterization methods were used to confirm the successful synthesis of Au–Ti2N–COOH composites.Using Au–Ti2N–COOH as the SERS substrate, we detected melamine in spiked dairy product samples with significantly enhanced sensitivity and stability compared to nitride-doped MXene alone. The detection limit in liquid milk stands at 3.7008 μg kg−1, with spike recovery rates ranging from 99.84% to 107.55% and an approximate RSD of 5%. This work demonstrates the effectiveness of our approach in designing a label-free, rapid, and robust SERS platform for the accurate quantitation of melamine contamination in food, thereby mitigating health risks associated with melamine adulteration.
研究领域:
材料科学
·
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 49
·2303113
·
IF 13.3
Yan Gao,Jinjie Lin,Xiao Chen,Zhaodi Tang,Geng Qin,Ge Wang
2D MXene is highly preferred for photothermal energy conversion and microwave absorption. However, the aggregation issue, insufficient dielectric loss capacity, and lack of magnetic loss capacity for MXene severely hinder its practical applications. Herein, the authors propose multi-dimensional nanostructure engineering to electrostatically assemble 2D MXene and layered double hydroxides (LDH) derived from ZIF-67 polyhedron into a 3D hollow framework (LDH@MXene), and subsequently calcined to construct a Co nanoparticle-modified 3D hollow C-LDH@MXene framework to encapsulate a paraffin wax (PW) phase change material (PCM). The 3D hollow C-LDH@MXene framework not only prevents 2D MXene from aggregation but also contributes a high thermal energy storage density (131.04 J g −1 ). Benefiting from a 3D conductive network facilitating the rapid transport of photons and phonons from the interface to the interior and the synergistic localized surface plasmon resonance (LSPR) effect of MXene and Co magnetic nanoparticles, the C-LDH@MXene-PW composite PCM yielded a high photothermal storage efficiency of 96.52%. Besides, C-LDH@MXene-PW composite PCMs also exhibited efficient microwave absorption with a minimum reflection loss of −20.87 dB at 13.30 GHz with a matching thickness of only 2 mm. This distinctive design provides constructive references for the development of integrated composite materials for energy storage and microwave absorption.
研究领域:
材料科学
·
纳米技术
·
能源存储
·
电磁材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）