JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 20
·13247-13254
·
IF 3.442
Liu Hao,Chen Bochao,Liao Libing,Fan Peng,Hai Yun,Wu Yuanyuan,Lv Guocheng,Mei Lefu,Hao Huiying,Xing Jie,Dong Jingjing
Metallic 1T MoS 2 greatly benefits the supercapacitance of MoS 2 due to its considerably higher conductivity as compared to semiconducting 2H MoS 2 . Alkali metals, such as Li, Na and K, are always used to prepare 1T MoS 2 through intercalation of alkali metal ions into the interlayer of 2H MoS 2 . Nevertheless, the influences of the alkali-earth metals as the guest in the interlayer of MoS 2 on its structure and electrochemical capacitor performance are rarely investigated. Herein, we introduced hydrated Mg ions as the guest into MoS 2 nanosheets. The interlayer spacing was increased to 1.144 nm after the introduction of hydrated Mg ions, larger than that of the pristine MoS 2 (0.620 nm) and restacking MoS 2 (0.626 nm). The enlarged interlayer spacing can accommodate more ions during intercalation process. Moreover, the 1T phase concentration after the introduction of hydrated Mg ions was as high as ~ 90%, which benefits the charge transfer during the charging/discharging processes. Consequently, the specific capacitance of the MoS 2 with Mg guest ions as well as the energy densities and power densities was greatly improved as compared to those of the restacking MoS 2 or pristine MoS 2 counterparts. The present work not only demonstrated a new strategy for engineering the physical properties and improving the electrochemical performance of MoS 2 supercapacitor electrode through pre-intercalation of alkali-earth metal ions in the interlayer of MoS 2 , but also has directive significance for the design of other layered electrode materials for energy storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Aihu Feng,Yun Yu,Feng Jiang,Yong Wang,Le Mi,Yang Yu,Lixin Song
MXene , a new family of 2D transition metal carbides and carbonitrides , has been proved to possess excellent electrical conductivity and hydrophilicity. In this work, a single-step method to produce the larger interplanar spacing 2D MXene Ti 3 C 2 by etching Ti 3 AlC 2 with NH 4 HF 2 was demonstrated, and the optimal reaction conditions between Ti 3 AlC 2 and NH 4 HF 2 were systematically researched. The morphology and microstructure of samples were characterized by scanning electron smicroscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD). The thermal stability of Ti 3 C 2 was investigated by the thermogravimetry (TG) and differential thermal analyzer (DTA). It was found that the lattice parameter c of obtained Ti 3 C 2 was up to 24.9 Å, and the larger interplanar spacing Ti 3 C 2 was more stable than the sample exfoliated by HF. The transition temperature in air from NH 4 HF 2 -etched Ti 3 C 2 to anatase TiO 2 thoroughly is more than 500 ℃, and the multilayered structure of Ti 3 C 2 could be well retained even afer 900 ℃ heat treatment, while the value of HF-etched Ti 3 C 2 is less than 350 ℃. This work is important for exploring a safe synthesis method and well understanding the thermal stability of 2D MXene materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Yin Hong Ran,Shi Yong Sun,Ke Xuan Shen,Dao Yong Tan,Yu Hang Liu,Liu Li,Yu Quan Ren
Silylation, also known as silane grafting, is frequently used to organically modify montmorillonite (organo-Mt), which of properties were depended on the type of siloxane and intercalated interlayer structure of Mt, for construction of functional materials utilizing in a variety application of industry. We have synthesized organo-Mt using different siloxanes after Mt was firstly modified at three different surfactants of cationic cetyltrimethylammonium bromide (CTAB), anionic sodium oleate (So) and nonionic sorbitan monostearate (Span60) to identifying the effect of surfactants for silylation of Mt. The spectral and structural characters of the obtained products were characterized by a combination of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetry (TG), and contact angle analysis. The basal spacing of the organo-Mt increased with surfactants loading. We found that CTAB can significantly increase the spacing between layers of Mt from 1.55nm to 1.90nm, load more siloxane on Mt. The average contact angles of CTAB-Mt-APTES and CTAB-Mt-PTES were 69.9±0.3° and 80.7±0.3°, which could be more prone to the interlayer locking effect. Our study showed that the charge of surfactants has significant influence for silylation of Mt, resulting in the loading amount of silane, interlayer structure, and the surface wetting properties.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
Small
·
2024
·
IF 13
Yanlin Zhang,Jinhao Hu,Guoying Bai
MXene's configuration, whether it is aggregated or dispersed in a monolayer, determines the specific application areas and even greatly influences the intrinsic properties of MXene. However, how to desirably control MXene's configuration is challenging. Here, a simple, additive-free, chemical reaction-free, and scalable strategy to optionally and reversibly regulate MXene's ordered stacking and delamination of MXene aggregates (AM) is reported. Just by controlled freezing of MXene aqueous dispersions, the aggregation percentage, delamination percentage, and interlayer spacing of AM can be finely tuned. Experimental results reveal that the freezing-induced aggregation and delamination effects can be explained by the squeezing action of growing ice grains on the MXene excluded/concentrated between ice grains and the expanding action caused by the ice formation between AM lamellae, respectively. The dominance between them depends on the freezing parameter-influenced ice nucleation sites, numbers, and ice grain sizes. This work not only contributes to the preparation, storage, and practical applications of MXene, but also opens a new and green avenue for controlling materials’ assembly structures.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2024
·
IF 8.3
Yue Zhao,Shan Ni,Yafeng Liu,Wenjie Wang,Yuan Meng,Huifang Xing,Huizhou Liu,Liangrong Yang
To address the environmental and resource challenges arising from the advancement of the nuclear power industry, it becomes imperative to foster the development of efficient and expeditious materials for uranium adsorption. Here, for the first time, a kind of niobium phosphate with improvement of interlayer spacing and hydrophilicity (NbP-8) is employed by crystal phase modulation for uranium adsorption, which synergistically realizes structural and interfacial microenvironment modulation. Characterizations demonstrate that the expanded interlayer spacing contributes to accommodation of uranyl which increases adsorption capacity, and the enhanced hydrophilicity reduces infiltration time and greatly accelerates the adsorption rate. Consequently, NbP-8 possesses exceptional adsorption capacity of 1470.4 mg g −1 , ultra-fast adsorption rate with an equilibrium time of 1 min and high selectivity, delivering one of the best phosphate uranium adsorbents. Moreover, this work opens a new venue for optimizing performance of phosphate by changing the crystal phase to modulate structure and interfacial microenvironment for uranium adsorption.
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
Membranes
·
2022
·Vol. 12
·期 8
·803
·
IF 4.562
Na Meng,Pinping Zhao,Wei Zhou,Jie Yan,Die Hu,Yanqing Fang,Jun Lu,Qiang Liu
Graphene oxide (GO) membranes have attracted significant attention in the field of water processing in recent years due to their unique characteristics. However, few reports focus on both membrane stability and the “trade-off” effect. In this study, a series of aliphatic diamines (1, 2-ethylenediamine, 1, 4-butanediamine, and 1, 6-hexamethylenediamine) of covalent crosslinked GO were used to prepare diamine-modified nanofiltration membranes, BPPO/AX-GO, with adjustable layer spacing using the vacuum extraction–filtration method. Moreover, Ax-GO-modified nanofiltration membranes modified with adipose diamine had higher layer spacing, lower mass-transfer resistance, and better stability. When the number of carbon atoms was 5, the best layer spacing was reached, and when the number of carbon atoms was greater than 4, the modified membrane nanosheets more easily accumulated. With the increase in layer spacing, the water flux of the composite film increased to 26.27 L/m2·h·bar. Meanwhile, adipose diamine crosslinking significantly improved the stability of GO films. The interception sequence of different valence salts in the composite membrane was NaCl > Na2SO4> MgSO4, and the rejection rate of bivalent salts was higher than that of monovalent salts. The results can provide some experimental basis and research ideas for overcoming the “trade-off” effect of a lamellar GO membrane.Keywords:graphene oxide;layer-spacing control;nanofiltration membrane;separation of function
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Huimin Yang,Zhenming Du,Yazhou Yang,Xiang Li,Qirui Wu,Jiahong Tang,Xiaoxia Wang,Dawen Zeng
Nitrogen dioxide (NO 2 ) is a common gas that can cause irreversible damage to human health, emphasizing the essentiality of developing highly sensitive NO 2 sensors with good selectivity and low consumption. Here, a facile in–situ cation exchange method was employed to successfully synthesize interlayer expansion Ag intercalated SnS 2 with S vacancies for NO 2 gas sensing. The presence of S vacancies strongly improves the electronic structure of SnS 2 and significantly facilitates the interaction of NO 2 with the sensor. Moreover, the interlayer spacing of SnS 2 is expanded by 0.48 Å after Ag intercalation, prompting diffusion behavior of NO 2 molecules between the interlayers. Benefiting from the factors above, SnS 2 –Ag exhibited excellent gas sensing performance for NO 2 with a high response to 5 ppm NO 2 (response value = 8.37) and detection limits as low as 200 ppb at a low temperature of 100 °C. This work combines defect engineering with interlayer engineering to provide a new perspective for extending the application of SnS 2 gas sensors.
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
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 7
·1744-1752
·
IF 5.934
Ruinan Qin,Hao Wan,Xiaohe Liu,Gen Chen,Ning Zhang,Renzhi Ma,Guanzhou Qiu
Due to the low cost, abundant reserves and redox-active features, electrocatalysts based on 3d transition metals have been thoroughly evaluated and are considered promising candidates to the current commercial noble metal-based materials. Designing elaborate structures and favorable phase composition is regarded as effective to improve the activity in electrocatalysis. Herein, three kinds of layered cobalt hydroxide nanocones (NCs) with tunable interlayer spacing determined by the intercalated anion species were prepared. Because of the larger interlayer spacing which might be beneficial for faster mass transfer, dodecyl sulfate (DS−) ion-intercalated layered cobalt hydroxide NCs yielded current densities of 5 and 10.65 mA cm−2 at overpotentials of 0.50 and 0.57 V, respectively, in the electrolytic oxygen evolution reaction (OER) in a neutral phosphate buffer solution (PBS); thus, they surpassed their counterparts with decreased layer distances induced by intercalated acetate (CH3COO−) or nitrate (NO3−) anions. When a further phosphidation treatment was adopted on NO3−-intercalated cobalt hydroxide NCs, a cobalt phosphide (CoP) product with well-maintained conical morphology was obtained, which reduced the overpotential of ∼20 mV to reach the anodic exchange current density of 5 mA cm−2. The activity enhancement induced by the tuning of interlayer spacing and phosphidation offers great promise for developing high-activity catalysts by rationally designing phase structure and composition for electrochemical energy conversion.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 14
·9594-9601
·
IF 3.9
Yaotong Li,Chunru Zhao,Abdukayum Abdukader,Xiang Wu
Aqueous zinc ion batteries (AZIBs) have been widely investigated due to their characteristics of convenient operation and intrinsic safety. However, there are several issues to be addressed in AZIBs, such as slow diffusion kinetics of Zn2+, cathode material dissolution and the dendrite formation of zinc anodes. Thus, it is challenging to prepare a high-performance cathode material. In this work, we prepare NH4V4O10 flower-like structures by a facile hydrothermal route. The introduction of chitosan significantly enlarges the layer spacing of the (001) crystal plane. The assembled Zn//NVO-0.15C batteries deliver a specific capacity of 520.54 mA h g−1 at a current density of 0.2 A g−1. Furthermore, they maintain 91% of the retention rate at 5.0 A g−1 after 1000 times cycling. It demonstrates the excellent zinc ion storage behavior of ammonium vanadate electrode materials for AZIBs.
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
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2018
·Vol. 29
·期 7
·1516-1526
·
IF 1.444
Huang Xue,Yin Yaoqi,Zhang Buning,Feng Guangzhu
The effects of structure and composition of different montmorillonites on their catalytic performance in the dimerization of unsaturated fatty acids were investigated. The dimerization reaction was performed at 240 ºC for 3 h, with montmorillonite as catalyst, and LiCl as the co-catalyst. The results showed that the specific surface areas of the different montmorillonites did not have a major effect on their catalytic performance, but the interlayer spacing and surface acidity of montmorillonite show significant effects on the product yield. After the organic modification through hexadecyl trimethyl ammonium bromide (CTAB) intercalation, the microenvironment of the montmorillonite layer changes. Moreover, the inner and outer surfaces change from being hydrophilic to lipophilic, which improves the dispersibility of montmorillonite in fatty acids. The xAl/xSi molar ratios of the three samples are similar and lie within the range of 0.4306-0.5010, thus the xAl/xSi molar ratio has little effect on the dimerization reaction.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 47
·2000815
·
IF 16.836
Shuangshuang Zhao,Chaofan Chen,Xin Zhao,Xuefeng Chu,Fei Du,Gang Chen,Yury Gogotsi,Yu Gao,Yohan Dall'Agnese
MXenes derived from 413 MAX phases are rarely studied but they have the potential to have superior electrical and mechanical properties thanks to a thicker monolayer (four layers of transition metal and three layers of carbon or nitrogen). In this paper, Nb 4 C 3 T x MXene nanosheets are delaminated and freestanding film with 1.77 nm interlayer spacing is obtained, which is larger than that of most previous MXenes. When Nb 4 C 3 T x freestanding films are tested as supercapacitors electrodes, Nb 4 C 3 T x shows high volumetric capacitance, 1075, 687, and 506 F cm −3 in 1 m H 2 SO 4 , 1 m KOH, and 1 m MgSO 4 , respectively, at the scan rate of 5 mV s −1 . An in situ X-ray diffraction technique is used to study the structural changes during the electrochemical charging in 1 m H 2 SO 4 and 1 m MgSO 4 . There is almost no change in the 21 Å interlayer spacing during the cycling, because the space between the MXene layers is sufficient to accommodate the insertion and deinsertion of cations. This can lead to stable performance of Nb 4 C 3 T x MXene energy storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Xu,Zhong Dong,Yujin Li,Ke-Jing Huang,Kening Liu,Chengyuan Cao
Water system zinc ion batteries (ZIBs) displays the attractive advantages and it has been considered as the main energy storage device to replace lithium ion batteries (LIBs). Unfortunately, the existing cathode materials are far from achieving the excellent performance required by increasing energy consumption. In recent years, the popular MoS 2 materials still suffer from the inherent defects of poor electrical conductivity, unstable structure, and large volume expansion and lamellar stacking during charging and discharging, resulting in weak periodic stability and severely hindering its commercial applications. In view of the special requirements of cathode materials for ZIBs, this work innovatively proposes the construction of new-type ternary composite nanomaterials, comprehensively improve the practicability of MoS 2 materials. The experimental results confirm that the prepared MoS 2 @WS 2 @CC composite material has high specific capacity and excellent rate performance, due to the synergistic effect of conductive carbon fiber substrate and large layer spacing WS 2 which can improve the volume expansion and diffusion rate fundamentally. Therefore, we can predict that the MoS 2 @WS 2 @CC composite is expected to accelerate the commercial application of ZIBs, and provide ideas for the design of other energy storage materials.
研究领域:
材料科学
·
能源存储
✓ 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）