JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yu Jiang,Rong Yang,Chaojiang Fan,Xin Dong,Hongyu Shang,Lei Mao,Bailing Jiang,Yinglin Yan
As one of the most important prerequisites for the practical application of lithium-sulfur (Li-S) batteries, the efficient utilization of active materials still meets the challenge to activate the dissolved polysulfide between the cathode side and the separator. The MXene has metallic centers and rich surface functions to anchor polysulfides, which prevent the shuttle of polysulfides, is widely used in Li-S batteries. However, the self-stacking defects of MXene hinder its chemisorption and catalytic of polysulfides. Here, a plain, scalable additive plug-in scheme was designed for MXene, and the self-supporting film obtained by dual-intercalation supplied an interlayer for Li-S batteries. The macromolecular cetyltrimethylammonium bromide is used to open the layer distance of MXene and expose the catalytic sites, and the nanometer carbon nanotubes are employed as the second insertion to distribute the conductive carbon networks on the MXene nanosheets to physically confine the polysulfides. The functional interlayer carries adsorption and catalytic activities toward polysulfides conversion. Therefore, the Li-S batteries with the interlayer had an initial discharge specific capacity of 1491.8 mA h g −1 at 0.1 C, and an ultra-low-capacity decay of 0.038% per cycle after 500 cycles at 1 C. This work provides an effective strategy on MXene to construct functional intermediate layer for Li-S batteries to hinder the shuttling effect and catalyze the redox conversion of the polysulfides.
研究领域:
材料科学
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能源存储技术
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产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 14
·期 4
·1218-1227
·
IF 8.183
Huang Pengfei,Zhang Shunlong,Ying Hangjun,Yang Wentao,Wang Jianli,Guo Rongnan,Han Weiqiang
Pillaring technologies have been considered as an effective way to improve lithium storage performance of Ti 3 C 2 T x MXene. Nevertheless, the pillared hybrids suffer from sluggish Li + diffusion kinetics and electronic transportation due to the compact multi-layered MXene structure, thus exhibiting inferior rate performance. Herein, the few-layered Ti 3 C 2 MXene (f-Ti 3 C 2 MXene) which is free from restacking can be prepared quickly based on the NH 4 + ions method. Besides, Fe nanocomplex pillared few-layered Ti 3 C 2 T x (FPTC) heterostructures are fabricated via the intercalation of Fe ions into the interlayer of f-Ti 3 C 2 MXene. The f-Ti 3 C 2 MXene which is immune to restacking can provide a highly conductive substrate for the rapid transport of Li + ions and electrons and possess adequate electrolyte accessible area. Moreover, f-Ti 3 C 2 MXene can efficiently relieve the aggregation, prevent the pulverization and buffer the large volume change of Fe nanocomplex during lithiation/delithiation process, leading to enhanced charge transfer kinetics and excellent structural stability of FPTC composites. Consequently, the FPTC hybrids exhibit a high capacity of 535 mAh·g −1 after 150 cycles at 0.5 A·g −1 and an enhanced rate performance with 310 mAh·g −1 after 850 cycles at 5 A·g −1 . This strategy is facile, universal and can be extended to fabricate various few-layered MXene-derived hybrids with superior rate capability.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Biosensors-Basel
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2022
·Vol. 12
·期 10
·865
·
IF 5.743
Yuting Qiao,Xianrong Liu,Zhi Jia,Peng Zhang,Li Gao,Bingxin Liu,Lijuan Qiao,Lei Zhang
Abnormal protein phosphorylation may relate to diseases such as Alzheimer’s, schizophrenia, and Parkinson’s. Therefore, the real-time detection of phosphoproteins in sweat was of great significance for the early knowledge, detection, and treatment of neurological diseases. In this work, anatase/rutile TiO2was in situ grown on the MXene surface to constructing the intercalation structure MXene@anatase/rutile TiO2ternary heterostructure as a sensing platform for detecting phosphoprotein in sweat. Here, the intercalation structure of MXene acted as electron and diffusion channels for phosphoproteins. The in situ grown anatase/rutile TiO2with n-n-type heterostructure provided specific adsorption sites for the phosphoproteins. The determination of phosphoprotein covered concentrations in sweat, with linear range from 0.01 to 1 mg/mL, along with a low LOD of 1.52 μM. It is worth noting that, since the macromolecular phosphoprotein was adsorbed on the surface of the material, the electrochemical signal gradually decreased with the increase of phosphoprotein concentration. In addition, the active sites in the MXene@anatase/rutile TiO2ternary heterojunction and synergistic effect of the heterojunction were verified by first-principle calculations to further realize the response to phosphoproteins. Additionally, the effective diffusion capacity and mobility of phosphoprotein molecules in the ternary heterojunction structure were studied by molecular dynamics simulation. Furthermore, the constructed sensing platform showed high selectivity, repeatability, reproducibility, and stability, and this newly developed sensor can detect for phosphoprotein in actual sweat samples. This satisfactory sensing strategy could be promoted to realize the noninvasive and continuous detection of sweat.Keywords:sweat;phosphoprotein;MXene;anatae/rutile TiO2;intercalation structure;healthcare monitoring
研究领域:
生物医学工程
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2013
·
IF 3.365
Sen Lin,Lei Shi,Hongpeng Zhang,Na Zhang,Xianfeng Yi,Anmin Zheng,Xuebing Li
Al-SBA-15 containing plug structures inside straight channels have been hydrothermally synthesized through a one-step synthesis strategy in an environmentally friendly acid-free medium. The effects of steaming, alkali, and acid post-treatments on the structural properties were investigated by powder X-ray diffraction (XRD), nitrogen adsorption–desorption at 77 K, transmission electron microscopy (TEM), scanning electron microscopy (SEM), FT-IR spectrum, 27 Al MAS NMR, and inductively coupled plasma (ICP) analyses. The presence of the plugs can significantly enhance structural stability against steaming or alkali post-treatments. Acid post-treatment can be a very simple and convenient technique for adjusting the textural properties of plug-containing Al-SBA-15, and especially for optimizing the accessibility to active sites. Acid post-treatment at the low temperatures of 313 and 323 K results in the formation of a larger specific surface area (905 m 2 /g) and pore volume (0.94 cm 3 /g) through an “open door” effect in the plugs, without eliminating any of the plugs from the channels. In particular, nearly half of the secondary micropores on the pore walls were preserved. In contrast, raising the acid post-treatment temperature further to 333 and 343 K caused a “closed doors” effect through the blockage of pores in the plugs by the extracted fragments. After loading with nickel, the catalyst exhibited a higher yield of C 10+ olefins in ethylene oligomerization , and more importantly, after steaming and acid post-treatments at higher temperatures, the samples showed shape selectivity for the C 16 olefin.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
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2012
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IF 2.474
Zhujian Huang,Pingxiao Wu,Xing Zhang,Xiaorong Wang,Nengwu Zhu,Jinhua Wu,Ping Li
In this study, intercalation of Fe(III) complexes [Fe(Ox) 3 ] 3− and [Fe(Cit) 2 ] 3− in Mg 2 Al layered double hydroxides (LDHs) had been carried out by different routes: direct self-assembly, reconstruction and anion exchange. The result of XRD indicated that these two kinds of Fe(III) complexes intercalated LDHs (LDHs/Fe-complexes) could be successfully synthesized by anion exchange obtaining two well crystallized LDHs both with a large basal spacing. The chemical environment of iron ion in the intercalated Fe complexes was determined by FTIR , XPS and XAFS, the results of which concertedly proved that the intercalated Fe complexes were well preserved in the interlayer of LDHs. The arrangement of the Fe(III) complexes anions in the galleries of LDHs was studied by one-dimensional electron density projection. The results showed that the [Fe(Ox) 3 ] 3− anions were probably accommodated in the gallery of LDHs as an interdigitated bilayer arrangement, and the [Fe(Cit) 2 ] 3− were perpendicularly arranged against the LDHs sheets. Through the research, it is proved that the obtained LDHs/Fe-complexes markedly enhanced the UV–vis absorption ability of Fe complexes.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Mingyang Yang,Lujie Cao,Zhenyu Wang,Yuanju Qu,Chaoqun Shang,Hanyu Guo,Wei Xiong,Junjun Zhang,Run Shi,Jianli Zou,Chun Cheng,Hui Pan,Zhouguang Lu
A novel and highly active vanadium self-intercalated C/V 1.11 S 2 nanosheets with abundant active sites are fabricated by a simple hydrothermal-calcinations method. The structures and morphology of C/V 1.11 S 2 nanosheets were characterized by XRD, SEM, XPS and TEM. Particularly, PVP (polyvinylpyrrolidone) was used as surfactant to control the morphology of vanadium sulfide and carbon source to reduce the vanadium sulfide into vanadium self-intercalated V 1.11 S 2 phase with rich active sites. The C/V 1.11 S 2 nanosheets showed an excellent electrocatalytic activity for hydrogen evolution reaction, including a low onset potential of 15 mV vs. RHE (reversible hydrogen electrode), small Tafel slope of 51 mV dec −1 , as well as extraordinary catalytic stability. The first-principle calculations further confirmed that the V 1.11 S 2 has a much lower Gibbs free energy for hydrogen adsorption (ΔG H ) than that of VS 2 . The enhanced HER performance can be contributed to the unique vanadium self-intercalated structures, nanostructured morphology and rich sulfur defects of the obtained C/V 1.11 S 2 nanosheets. We believe that the C/V 1.11 S 2 can be used as electrocatalyst in chemical engineering industry and our method provides guidance on the fabrication of other defective transition-metal dichalcogenides to improve their catalytic performances.
研究领域:
材料科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2017
·Vol. 17
·期 9
·6558-6565
·
IF 1.483
Qin Wen-Li,Lv Han,Xia Tian,Ye Ying,Chen Xue-Gang,Lyu Shuang-Shuang
Talc is a layered silicate that was long recognized as un-intercalated. In this study, we prepared a novel talc/TiO2 nanocomposite by intercalating tetrabutyltitanate (TNBT) into talc and then hydrolyzing and calcining them at 500 °C. The XRD and TEM characterizations
suggested that we successfully intercalated TNBT into the talc layers while the original layered structure was preserved. The pore volumes and BET surface areas were enhanced greatly during the preparation of the nanocomposite, which induced higher methylene blue (MB) adsorption when compared
with the acidified talc. The photocatalytic degradation capacity of the samples increased significantly with the loading of TiO2 nanoparticles and TNBT/talc ratios. In addition, the spatial confinement of talc layers may also enhance its photocatalytic activity. The maximum MB removal
rate exceeded 99.8% at 2.0 g L−1. The dimethylamino and methyl groups of MB molecules were preferably degraded according to the full-scan UV-Vis spectra. The MB removal rates increased with initial pH value and declined with initial MB concentration. Furthermore, the as-prepared
talc/TiO2 nanocomposite is a recyclable material according to the recycling experiments. The intercalation of talc and preparation of talc/TiO2 nanocomposite opened a new approach to utilize talc and a novel method to fabricate photocatalytic materials.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongen Shi,Yanzhong Wang,Zhen Tian,Baofeng Zhang,Li Guo,Yanjun Chen
To improve the inherent conductivity and extend the cycling durability of Na 3 V 2 (PO 4 ) 3 (NVP), this study suggests a technique for synthesis of phenol-formaldehyde (PF) resin-derived lamellar intercalated spherical NVP (PF-NVP/C) structures via solvothermal method. The unique lamellar intercalated sphere structure typically possesses good mechanical toughness, enabling better tolerance to the current impact. Moreover, spherical morphology features a significantly enlarged specific area of 144.32 m 2 g -1 , facilitating full contact between electrolyte and electrode, and providing additional active sites for Na + storage. Coupled with protective effect of carbon coating layers, the cycling stability is significantly improved. Meanwhile, highly conductive graphitized carbon skeleton from the pyrolysis of PF bonding with the uniform amorphous carbon layers constructs favourable networks for electronic transportation. Notably, the modified PF-NVP/C delivers a capacity of 115.5 mAh g -1 at 0.1 C. Remarkably, it can maintain a high capacity of 71.1 mAh g -1 and keeps 50.8 mAh g -1 even after 16000 cycles at 50 C, exhibiting outstanding cycling stability. Ex-situ XRD indicates the redox reaction of V 3+ /V 4+ is highly reversible. Furthermore, by comparing morphological and electrochemical kinetic characteristics of the PF-NVP/C before and after cycling, further evidence is provided to demonstrate its unique lamellar intercalated spherical morphology and excellent structural stability.
研究领域:
材料科学
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电化学
·
能源存储
·
无机非金属材料
·
纳米结构材料
✓ 已验证
DOI
高影响因子
Materials Today Sustainability
·
2023
·
IF 7.8
Y. He,G. Yue,J. Huo,C. Dong,G. Xie,F. Tan
Transition metal phosphides are becoming a main study topic in new catalytic materials field due to their similar properties to transition metal nitrides and carbides as well as their excellent reaction activity and catalytic selectivity for deep hydrodesulfurization and hydrodenitrogenation . Mxene, a two-dimensional layered material with high specific surface area and electrical conductivity , plays an important role in accelerating catalytic reduction of triiodide ion in dye-sensitized solar cells (DSSCs). In this work, the MoP/MoNiP 2 hybrid was synthesized while adopting Ti 3 C 2 Mxene to realize the intercalation structure of composite with simple conditions, therefore enabling a formation of ‘pillared effect’ in Ti 3 C 2 Mxene. The optimized MoP/MoNiP 2 @Ti 3 C 2 composite was achieved by adjusting the doping ratio of the two. The DSSCs based on the MoP/MoNiP 2 @Ti 3 C 2 catalyst with 80 wt% Ti 3 C 2 doping reache an enhancement of power conversion efficiency of 10.01%, much higher than that of the platinum counter electrode (8.22%). Through a suite of morphological and electrochemical analyses, we summarize the reasons for the performance enhancement to the synergistic effect of the MoP/MoNiP 2 hybrid and Ti 3 C 2 Mxene, and especially, the unique intercalation structure of MoP/MoNiP 2 @Ti 3 C 2 with ‘pillared effect’. The MoP/MoNiP 2 @Ti 3 C 2 counter electrode with perfect electrochemical and photoelectrochemical properties is a promising alternative to the platinum electrode for DSSCs in the future.
研究领域:
材料科学
·
电化学
·
太阳能
✓ 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）