CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2025
·
IF 3
Li Ouhang,Wang Bo,Liu Yong,Gao Xinxin,Zhang Kan,Sun Peng,Liu Fangmeng,Lu Geyu
The sensitive and selective detection of ppb-level (ppb: parts per billion) H 2 S using miniaturized and portable gas sensor is of great significance in environmental monitoring, medical diagnosis and many other fields. MXenes, with high electrical conductivity, large surface area, and abundant active sites, hold great promise for room temperature gas sensing applications. In this work, a room temperature H 2 S sensor was constructed utilizing Mo 2 CT x MXene sensitive material, synthesized by a typical LiF/HCl etching method. The H 2 S sensing characteristics of Mo 2 CT x sensor were further improved by controlling ultrasonic time and optimizing heat-treated temperature. The M-50 sensor utilizing optimized Mo 2 CT x sensing material exhibited good selectivity, the highest response value (−39.92%) to 1 ppm (ppm: parts per million) H 2 S, and the lowest detection limit of 30 ppb (theoretically 0.35 ppb). The enhanced H 2 S sensing properties are largely attributed to the fragmented nanosheet structure and surface defects caused by prolonging ultrasonic time and adjusting treatment temperature. Additionally, density functional theory (DFT) calculations demonstrated that surface Mo atom vacancy and edge of Mo 2 CT x could significantly improve the adsorption ability of H 2 S. The present work contributes to advancing exploration of Mo 2 CT x material in sensing applications.
研究领域:
材料科学
·
环境监测
·
医学诊断
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yitong Guo,Sen Jin,Libo Wang,Pingge He,Qianku Hu,Li-Zhen Fan,Aiguo Zhou
In this study, highly pure Mo 2 CT x MXene was successfully synthesized from Mo 2 Ga 2 C by etching in hydrothermal conditions for 24 h at 140–180°C. The etching solutions were lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF) or ammonium fluoride (NH 4 F) mixed with hydrochloric acid (HCl). The temperature to obtain pure Mo 2 CT x MXene in NH 4 F + HCl solution was 140°C, lower than that in other etching solutions. The thickness of as-prepared monolayer Mo 2 CT x nanosheet was measured to be 1.5 ± 0.3 nm by atomic force microscope. From thermogravimetry and differential thermal analysis, Mo 2 CT x MXene was found to be stable in argon atmosphere at a temperature of up to 500°C. As the temperature increased, Mo 2 CT x MXene gradually transformed, and β-Mo 2 C/MoC/Mo 3 C 2 was eventually formed to coexist with Mo 2 CT x MXene at 700°C. In air atmosphere, Mo 2 CT x MXene was stable at 200°C. At 590°C, Mo 2 CT x MXene was completely oxidized to MoO 3 .
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yitong Guo,Sen Jin,Libo Wang,Qixun Xia,Aiguo Zhou
In this paper, we report a novel method to rapidly prepare two-dimensional Mo 2 CT x MXene in a low-concentration etching solution. By this method, highly pure Mo 2 CT x MXene was synthesized from Mo 2 Ga 2 C by hydrothermal etching at 180 ℃ in the solution of ammonium hydrogen fluoride (NH 4 HF 2 ). The whole process requires only 2 h and the etching solution concentration is only 1 M. Compared with the acid solutions used in other methods, NH 4 HF 2 used in this method is in solid state and its water solution is mild for handling. Compared with other methods, this method requires a lower concentration of etching solution and a much shorter etching time. The Mo 2 CT x MXene made this method have comparable microstructure and properties with those made by other methods. The initial discharge capacity as an anode of lithium-ion batteries (LIB) was 139.35 mAh g -1 at 0.1 A g -1 . After 150th cycles, the final discharge capacity was 62.42 mAh g -1 at 0.1 A g -1 . The electrochemical performance is slightly higher than the sample made by general HF etching. This is the first report to make Mo 2 CT x MXene from the etching of bifluoride salt. Due to the short etching time and low concentration of the etching solution, this method can rapidly make Mo 2 CT x MXene at in low cost, which provides a route to explore the large-scale production of Mo 2 CT x MXene.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Yitong Guo,Chenxiao Wang,Xianju Shi,Yanhuan Chen,Lifang Wang,Yanan Liu,Yuqian Wang,Xiaoning Wang,Yukai Chang,Aiguo Zhou
In this paper, a green and efficient low-concentration ammonium fluoride etching strategy is developed for the synthesis of two-dimensional highly pure Mo 2 CT x MXene. Using the Mo 2 Ga 2 C MAX phase as the precursor, highly pure Mo 2 CT x MXene was prepared via hydrothermal etching with a 1 M NH 4 F aqueous solution at 160 °C for 12 h. By employing a slow-release fluorine source mechanism, the NH 4 F concentration was maintained at 1 M, significantly reducing toxicity risks and improving operational safety while providing a safe pathway for large-scale MXene production. The structural characterization of the material revealed that the as-prepared Mo 2 CT x MXene exhibits a typical two-dimensional layered structure, with microscopic morphology and crystal parameters consistent with those obtained by conventional etching methods. As an anode material for lithium-ion batteries, the Mo 2 CT x MXene delivered an initial discharge specific capacity of 873.5 mAh g −1 at a current density of 0.05 A g −1 , and retained 33.7 mAh g −1 after 100th cycles of high-rate cycling at 0.5 A g −1 . This represents the first application of a low-concentration NH 4 F etching system for preparing Mo 2 CT x MXene. The findings of this study not only enhance the safety of MXene synthesis but also provide new research directions for the development of green synthesis processes for Mo 2 CT x MXene.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Yitong Guo,Darong Liu,Bowen Huang,Libo Wang,Qixun Xia,Aiguo Zhou
In this study, highly pure Mo 2 CT x MXene was made from Mo 2 Ga 2 C by hydrothermal method in five different etching solutions (LiF, NaF, KF, NH 4 F or HF). The as-prepared multi-layer MXene samples were furthered delaminated by tetrabutyl-ammonium hydroxide (TBAOH) to increase the interlayer distance. The c -lattice parameter ( c -LP) was increased from 20.3 Å to 23.87 Å. Thereafter, the electrochemical properties of Mo 2 CT x MXene samples as anode of Li-ion batteries (LIBs) were investigated. The multilayer Mo 2 CT x MXene made by KF + HCl etching had some residual K + on the surface and had higher discharge specific capacity (32.7 mA h/g at the current density of 800 mA/g) than the samples made by other etchants. This is because that the residual K + on MXene surface pillar the multi-layer structure, which provides larger room for Li + storage and immigration. The Mo 2 CT x MXene after delamination with the c -LP of 23.87 Å presented a high discharge specific capacity of 239 mA h/g at the current density of 800 mA/g, which was 7.3 times higher than the discharge specific capacity of Mo 2 CT x MXene before delamination. The final discharge specific capacity was 118.83 mA h/g at 2000 mA/g after 100 cycles. The superior electrochemical performance of delaminated Mo 2 CT x MXene was attributed to the more easily accessible ion active sites between layers and the lower resistance. Therefore, the increasing of interlayer distance is the main direction to improve the performance of Mo 2 CT x as anode of LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xinfang Zhang,Changqing Yin,Shupei Liu,Dalong Cong,Zhongsheng Li,Jiao Wang,Tao Sun,Xiaoying Liu,Zhenyu Liang,Shuai Jiang,Jinjin Li,Shuang Yi,Yuxin Zhang,Jinsong Rao
Two-dimensional (2D) nanomaterials have proven that potential applications in protecting metals from corrosion and wear. However, it remains a challenge in easy agglomeration and complex functionalization of 2D nanosheets in nanocomposite coatings. Herein, Co-doped MgAl-V2O74– layered double hydroxide (LDH) with transition metal carbide (Mo2CTx) nanosheet composites (CV-LDH-MXene) was synthesized by using a doping-electrostatic synergistic assembly strategy. After layer-by-layer assembly, nanosheet composite coatings had thicknesses of −6.9 μm. The corrosion results show that the incorporation of the CV-LDH-MXene nanocomposite coating can increase impedance at 10–2 Hz by 1 order of magnitude compared to pure LDH coating and decrease the corrosion current density by ∼30-fold. Furthermore, the friction results claimed that the CV-LDH-MXene nanosheet composites could make the coefficient of friction maintain at 0.09 after the running-in period, which displayed excellent relatively stable and anti-wear properties. These phenomena confirmed that there existed a synergistic effect of V2O74– intercalation and layer-assembled Mo2CTx MXene, which achieved stable anti-corrosion and wear characteristics. This investigation proved a substantial significance for the creation of LDH and MXene nanosheets and a giant step forward in the application of anti-corrosion and anti-wear. In particular, we promote the application of nautical instruments, underwater weapons, and seawater batteries in the shipbuilding industry and marine engineering.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jie Liu,Qixun Xia,Libo Wang,Qianku Hu,Nanasaheb M. Shinde,Aiguo Zhou
Mo2CTx MXene materials, known for their high conductivity and abundant surface functional groups, are widely utilized as electrode materials in supercapacitors. However, their tendency to stack during electrochemical energy storage hinders their performance. The in situ growth of nanorod-shaped Ni,Co bimetallic metal–organic frameworks (Ni,Co-MOF) on Mo2CTx MXene effectively mitigates this stacking. With their porous structure and high specific surface area, MOFs excel in energy storage, and bimetallic MOFs outperform monometallic ones. The synergy between Mo2CTx MXene and Ni,Co-MOF yields an outstanding performance. In a three-electrode system with 1 M KOH, the Mo2CTx/Ni,Co-MOF composite shows a specific capacitance of 58 mAh g–1 (56.26 mAh cm–3) at 1 A g–1. When used in a Mo2CTx/Ni,Co-MOF//AC asymmetric supercapacitor, it achieves an energy density of 22.7 Wh kg–1(0.022 Wh cm–3) at a power density of 293 W kg–1 (0.284 W cm–3). Future work will focus on enhancing synthesis methods, exploring different bimetallic combinations, and optimizing electrode designs for gas sensors, batteries, fuel cells, biological sensors, and so on, with outstanding performance and sustainability.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Huajun Xu,Honglei Dong,Xintong Liu,He Qiao,Gang Chen,Fei Du,Yohan Dall’Agnese,Yu Gao
Molybdenum carbide (Mo2CTx MXene) did not possess suitable properties for supercapacitors. Herein, a short oxidation method of Mo2CTx in air at moderately high temperatures is proposed for fabricating a Mo2C/MoO3 heterostructure. The stability of Mo2CTx in air up to 700 °C and the phase transition at higher temperatures are confirmed. Such a heterostructure is beneficial in reducing the diffusion energy barrier of H+. In the aqueous system, the Mo2C/MoO3 electrode delivers a capacitance of up to 811 F g–1. A fully assembled symmetric solid-state supercapacitor delivers 224 F g–1 with an excellent retention rate of 91.05% after 7500 cycles. Besides, the supercapacitor can work at the low temperature of −60°, showing good low-temperature properties. The approach presented in this work opens a promising way to turn a neglected MXene, assumed to be unsuitable for supercapacitors, into one of the top-performing supercapacitor electrodes.
研究领域:
材料科学
·
储能
·
纳米技术
·
电化学
✓ 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
Journal of Energy Chemistry
·
2022
·
IF 13.599
Junyan Li,Wei Zhang,Xin Ge,Ming Lu,Xiangxin Xue,Zizhun Wang,Nailin Yue,Junkai Zhang,Xingyou Lang,Qing Jiang,Weitao Zheng
Inspired by a well-known architecture notion that load-bearing walls enable maintaining a highly-stable multiple-floored building, superior advantages are afforded via fabricating the NH 4 + ions pre-intercalated Mo 2 CT x MXene (Mo 2 CT x -N) in a mixed solution of NH 4 F and HCl via a simple one-step hydrothermal method. As a result of the synergistic effects of pillared structure, immobilizing -F groups and unlocking Mo-based redox, the Mo 2 CT x -N remarkably delivered a reversible capacity of 384.6 mAh g −1 at 200 mA g −1 after 100 cycles. Our work lays a foundation for fully packaging its optimal performance via carding and architecting the chemistry of the MXene layers and between them.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 22
·10992-11000
·
IF 6.97
Junmei Liang,Chaoying Ding,Jiapeng Liu,Tao Chen,WenChao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
The hydrogen evolution reaction (HER) in alkaline media is key for the cathodic reaction of electrochemical water splitting, but it suffers sluggish kinetics due to the slow water dissociation process. Here, we present a simple strategy to enhance the HER activity in alkaline media by engineering Co-doped MoS2 coupled with Mo2CTx MXene. The improved HER activity might be ascribed to the synergistic regulation of water dissociation sites and electronic conductivity. Co doping could effectively regulate the electronic structure of MoS2 and further improve the intrinsic activity of the catalyst. Mo2CTx MXene served as both the active and conductive substrate to facilitate electron transfer. As a result, the Co-MoS2/Mo2CTx nanohybrids showed dramatically enhanced HER performance with a low overpotential of 112 mV at a current density of 10 mA cm−2 and exhibited excellent long-term stability in alkaline media.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Fengling Wang,Sen Jin,Yaqiong Du,Qixun Xia,Libo Wang,Aiguo Zhou
Mo 2 C T x is a novel co-catalyst to enhance the photocatalytic performance of CdS for H 2 production. The surface of Mo 2 C T x is usually terminated by fluorine anion because it is generally made by the etching of fluoride-containing solution. Here we report, a novel method to prepare highly pure MXene with Br termination by the etching of pure HBr at 220 °C for 3 d, or the HBr solution mixed with LiBr, NaBr, KBr or NH 4 Br at 180 °C for 24 h. The pure HBr etching needs higher temperature and longer time to make pure Mo 2 C T x , however, which result lager interlayer space and more active sites. All the Mo 2 C T x samples show high co-catalytic performance to enhance the photocatalytic performance of CdS for H 2 production. The H 2 production rate of CdS combined with HBr etched sample was 17,566 μmol g −1 h −1 , similar with the sampled combined with traditionally HF etched sample. This is the first report to prepare MXene by etching of Br containing solution. The Mo 2 C T x made by this method is terminated by Br/O without F, and show excellent co-catalytic properties.
研究领域:
材料科学
·
化学
·
催化
·
纳米技术
✓ 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）