NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 14
·6720-6728
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IF 3.925
Jie Shen,Qi Sun,Jun Cao,Peng Wang,Weilin Jia,Suyang Wang,Ping Zhao,Zepeng Wang
Zeolite LTA, with high porosity and uniform pore distribution, has been widely used in the gas adsorption field. In this paper, a 1.38 nm thick two-dimensional zeolite LTA was synthesized from kaolin, changing the cubic morphology of the traditional zeolite LTA. SEM and TEM images showed that the zeolite LTA exhibited a lamellar structure. In a comparative experiment with CO2 adsorption at different temperatures, the 2D zeolite LTA with a large specific surface area could capture more CO2 than the conventional 3D zeolite LTA. In addition, the CO2/CH4 selectivity of the 2D Zeolite LTA was 76.78 at 298 K.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jian Zhang,Shuoxiao Zhang,Lingyu Zhang,Qing Yin,Zelin Wu,Jingbin Han
Two-dimensional Fe–beidellite/carbon (Fe–BEI@C) superlattice-like heterostructure was prepared by intercalation of glucose in the gallery of layered Fe–BEI followed by calcination. The interlaminar and superficial carbon coating enables Fe–BEI to have good rate performance, fast lithium-ion diffusion, and high pseudocapacitance contribution, leading to excellent lithium storage performance as anode material for lithium-ion batteries (LIBs). The Fe–BEI@C/Li half cell delivers a maximum specific capacity of 850 mAh·g–1 at 0.5 A·g–1 and has a 92.3% retention rate after 100 cycles along with a high-rate performance of 403 mAh·g–1 at 5 A·g–1. The reversible valence state change of Si2+/Si4+ and Fe0/Fex+ (0 < x < 3) in electrochemical cycles are realized without collapse of layered structure. Additionally, the Fe–BEI@C heterostructure displays a high Li+ diffusion coefficient of 10–13∼10–10 cm2 s–1, illustrating fast Li+ transfer in the interlayer of Fe–BEI@C heterostructure. Dynamic analysis reveals that the Si redox reaction is almost dominated by surface control and that of Fe is mainly diffusion-controlled. This work has exploited a novel layered silicate as anode material for LIBs and developed a molecular-level carbon hybridization method to improve their electrochemical performance, which is meaningful for the application of layered silicate in the energy-storage field.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zheqin Chen,Yongmin Xie,Jiaming Liu,Xiaocong Zhong,Zhifeng Xu,Ruixiang Wang
A cheap and effective electrocatalyst is a very good candidate for replacing precious metal catalysts for the diffusion of metal-air batteries. Herein, layered LaNi 0.6 Fe 0.4 O 3-δ (LNFO) was prepared via a modified sol-gel method using a carbon nanotube dispersion for pore formation. The prepared layered LNFO had an expanded specific surface area of 27.46 m 2 g −1 and uniform pores with a pore size of approximately 2 nm. The electrochemical performance of layered LNFO was tested at 1600 rpm using a rotating ring-disk electrode. It exhibited an onset potential of 0.89 V (vs. RHE), which was superior to that of bulk-LNFO (0.82 V). It also showed a half-wave potential of 0.74 V (vs. RHE), and a limited current density of 5.18 mA cm −2 . The oxygen reduction catalytic performance achieved using the modified sol-gel method was substantially higher than that achieved using the conventional synthesis method. Meanwhile, the chronoamperometric test conducted for over 7200 s demonstrated excellent catalyst stability.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Micro & Nano Letters
·
2023
·Vol. 19
·期 1
·e12182
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IF 1.3
Weilin Jia,Suyang Wang,Yingying Deng,Jie Shen,Ping Zhao,Zepeng Wang,Jiaojing Shao,Yuanyu Wang,Qi Sun
A simple and effective method was reported for the rapid synthesis of zeolite X from kaolin by adding a template agent. The results of X-ray diffraction confirm the good crystallinity of the synthesized X-zeolite with lamellar structure. Transmission electron microscopy images clearly demonstrate the lamellar structure of the synthesized X-zeolite. The corresponding selective electron diffraction pattern suggests that the crystal structure of X-type zeolite is octahedral. The co-existence and uniform distribution of Si, Al, O, and Na in the layered structure of the synthesized X-type zeolite are detected by element mapping. In addition, N 2 adsorption–desorption measurement indicates that the specific surface area of the lamellar zeolite X is 153.4625 m 2 g −1 . The micropore surface area is 148.8374 m 2 g −1 , and the micropore volume is 0.073377 m 2 g −1 . After exploring the influence of different temperatures on the adsorption of carbon dioxide, the research shows that two-dimensional zeolite X has the best adsorption capacity for carbon dioxide. The adsorption and separation performance of CO 2 /CH 4 was investigated. The study showed that the adsorption and separation coefficient of two-dimensional zeolite X was the highest.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Bing Wang,Qingtong Cao,Ming Cheng,Guomin Li,Jian Zhang,Hong Jiang
Although powdered photocatalysts has shown high degradation efficiency in photocatalytic reactions, their practical applications are limited by the poor recovery of powder. To improve its recycling performance, a three-dimensional layered photocatalytic fiber membrane was newly designed through electrospinning and coating process. The composition of the photocatalytic membrane was polyacrylonitrile (PAN), polydopamine (PDA) and Tb doping graphitized carbon nitride/ZnIn 2 S 4 (Tb-g-C 3 N 4 /ZnIn 2 S 4 ) from bottom to top. The photocatalytic performance of the prepared composite membranes was investigated under simulating sunlight. Compared to the prepared PAN@Tb-g-C 3 N 4 (PT), PAN@PDA/Tb-g-C 3 N 4 (PPT) and monolithic PAN@PDA/Tb-g-C 3 N 4 /ZnIn 2 S 4 (PPTZ), the PPTZ displayed the highest photocatalytic ability. The degradation rates of PPTZ for tylosin (TYL) and tetracycline (TC) were approximately 2.1 and 2.5 times than that of other samples. The superior photocatalytic activity of the PPTZ sample resulted from the formation of a heterostructure among Tb-g-C 3 N 4 , ZnIn 2 S 4 and PDA, which significantly inhibited the recombination of photogenerated carriers. PDA could act as an electron transfer medium so that electrons were transferred from the Tb-g-C 3 N 4 to the ZnIn 2 S 4 and PDA, which could be found in the study of its electron density with density functional theory (DFT). According to the free radical trapping analysis, the order of importance of the redox species was O 2 − > h + > OH. Moreover, the toxicity of the material was investigated to ensure that the material would not cause secondary pollution in practical applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 8
·4613-4621
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IF 2.2
Wang Hongjun,Yang Shuning,Zeng Xiong,Chen Mengyao,Guo Zicong,Mi Pengtao,Zhou Jing,Zhu Yuanyuan
Low-dimensional yttrium oxide (Y 2 O 3 ) nanostructures have garnered significant research interest due to their intriguing properties arising from the dimensional effect and the modulation of the band structure. However, the simple preparation of Y 2 O 3 nanosheets is rarely investigated due to the inherent limitations posed by the counterpart bulk cubic or monoclinic crystal structure. Herein, the low-dimensional layered Y 2 O 3 nanosheets are prepared by a facile route of rapid heating followed by centrifugation, in which its corresponding hydrous-chloride compound is used as the sole reagent. The formation stages of layered Y 2 O 3 nanosheets and corresponding mechanisms are elucidated in detail. The x-ray diffraction results confirm that the intermediate product after rapid heating is yttrium oxychloride (YOCl), which converts to the single-phase Y 2 O 3 with a 2D layered phase after centrifugation. In addition, the obtained Y 2 O 3 nanosheets possess a direct optical bandgap of 5.49 eV, and thus may hold promise for use in electronic applications. This research provides a facile and low-cost method for the preparation of other low-dimensional nanosheets with similar structures. Graphical Abstract
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xiangyu Huang,Qianqian Niu,Suna Fan,Yaopeng Zhang
Conjugated organic polymers (COP) are fundamental for the future development of electrochromic devices. Despite the progress of composite materials, the electrochromic performance of pristine COP is still limited by dense three-dimensional (3D) structure. This work reports the fabrication of high optical contrast polyaniline (PANI) films with fast switching speed by electrochemical polymerization . Benefitting from the stereo-structure and size of p-toluenesulfonic acid (pTSA), highly oriented lamellar polyaniline with nanoscale large inter-layer spacing and a disordered in-plane structure is obtained. These structural factors simultaneously improve ion diffusion capability and optimise reaction area, resulting in a high optical contrast of above 70% at a wavelength of 720 nm, a fast response time (0.8 s for coloring and 4.2 s for bleaching), and remarkable coloration efficiency (328.5 cm 2 C −1 ). In addition, the pTSA-PANI quasi-solid-state electrochromic device displayed good electrochromic performance with optical contrast of 82%, suggesting an inherent suitability for use in electrochromic fields. Furthermore, the synthetic method developed here represents a new and simple technique to modulate photoelectronic properties.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 15
·3910-3916
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IF 5.976
Sangen Zhao,Yi Yang,Yaoguo Shen,Xiaodong Wang,Qingran Ding,Xianfeng Li,Yanqiang Li,Lina Li,Zheshuai Lin,Junhua Luo
Few nonlinear optical (NLO) materials are available for deep-UV second-harmonic generation (SHG), limited by the fundamental requirements of the structure-directing optical properties. KBe2BO3F2 is the sole exception, but it suffers from the high toxicity of the compositional beryllium element and a serious layering growth tendency. Here, we report a beryllium-free deep-UV NLO phosphate with honeycomb-like topological structural layers, namely, CsNaMgP2O7. The phosphate exhibits an enhanced SHG response of 1.1 times that of KH2PO4, which is comparable to that of KBe2BO3F2. Based on theoretical analysis, the enhanced SHG response can be well rationalized. Meanwhile, CsNaMgP2O7 possesses a reinforced interlayer bonding of about 2.95 times that of KBe2BO3F2, which is very favorable to mitigate the layering growth tendency. This work will be helpful to better understand the structure–property relationships in deep-UV NLO materials.
研究领域:
材料科学
·
光学
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DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Kun Lei,Chidao Zhang,Xinling Wang,Yunlong Sun,Haijun Xiao,Zhen Zheng
In the paper, graphene oxide (GO) and two kinds of styrenic resins, poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) and maleic anhydride (MA) grafted SEBS (MA-g-SEBS), were utilized to explore the interfacial interaction of carbon-based materials and block copolymers as layer-by-layer (LBL) assembly films. The details of the interlayer interaction of the two kinds of composite films were investigated through the analysis of the mechanical properties and internal structure of the composites. For the SEBS/GO composite film, the “interlock” structure tended to form between the GO sheets and SEBS resin, and the physical “interlocking effect” could make full use of the excellent mechanical properties of GO nanosheets. As a result, both failure strength and elongation at break of the SEBS/GO composite film were enhanced by 50 and 25%, respectively. On the other hand, some different structures were found in the MA-g-SEBS/GO composite film, where the GO sheets stacked onto the resin closely because of the chemical interaction between them and no obvious “interlocks” was found within the interface, and the chemical interface interaction was strong enough to prevent the slide of GO nanosheets under tension after the graphene sheets were highly oxidized, so the mechanical properties of the MA-g-SEBS/GO composite film could be also enhanced. Based on an overall consideration of the research results of these LBL assembled composites, choosing more perfect materials and structures is needed, which should use physical and chemical interfacial interactions more efficiently, to obtain better mechanical properties of inorganic carbon–organic resin composites.
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Yi Ding,Yan Wu,Ying Tian,Yuzeng Xu,Minna Hou,Bo Zhou,Jingshan Luo,Guofu Hou,Ying Zhao,Xiaodan Zhang
Guanidinium (GA) cations are intentionally introduced in MAPbI 3 perovskite by considering its potential capability of stabilizing the material through plenty of hydrogen bonds and mitigating hysteresis because of the zero dipole moment. The configurations of GA cation in film and its effects on structural, optoelectronic and photovoltaic properties of perovskite have been comprehensively studied by systematically modulating the GA ratio. It has been demonstrated that moderate GA cations can effectively passivate the defect surrounding perovskite grains, yielding an enhanced efficiency as high as ~19.2% in a p-i-n type planar solar cells with the GA ratio of 15%. Further increasing the GA ratio deteriorates device performance, as extra GA cations hinder grain growth and thus reduce the grain size, which facilitates the defect generation around the enhanced interface. Moreover, a new two-dimensional (2D) layered perovskite phase that features alternating GA and MA cations in the interlayer space (ACI) appears ultimately, while the ACI phase typically suffers from slow charge transportation across the parallel PbI 2 octahedral layers separated by large A-site cations.
研究领域:
材料科学
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光电子学
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太阳能电池研究
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Fujie Li,Liu Gao,Yunhe Lv,Bin Cai,Chao Wang,Xiu Song Zhao
Layered sodium trititanate (Na 2 Ti 3 O 7 , NTO) is a safe and cost-effective anode material for sodium-ion batteries. However, its sluggish Na + diffusion kinetics, poor electron conductivity, and unstable layered structure against cycling pose major barriers for practical applications. Here, we show a novel doping strategy for improving Na + storage properties of NTO. Instead of doping transition metals in the Ti 4+ site, doping of alkaline metal K + by partial substitution of Na + in NTO is demonstrated. The K + -doped NTO displays enhanced Na + -storage capacity and transport kinetics, as well as improved cycling stability. It delivers a reversible Na + storage specific capacity of 162 mAh g −1 at 0.1C, a capacity retention of 75 % after 8200 cycles at 1C or after 4000 cycles at 10C. In situ X-ray diffraction characterization and density functional theory calculation results reveal that the improved performance is mainly attributed to increased exposure of the Na + storage (100) plane, widened interlayer spacing and stabilized layered structure. A full cell assembled with the K + -doped NTO as anode and Na 3 V 2 (PO 4 ) 3 @C as cathode delivers a specific energy density of 165 Wh kg −1 . This work provides an alternative approach to modifying NTO for improving its Na + storage properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2018
·
IF 3.193
Peng-Ji Wang,Dui-Jun Liao,Xiao-Ping Hu,Ning Pan,Wen-Xiong Li,De-Yi Wang,Yong Yao
A bio-based organic-inorganic hyperbranched hybrid (PAMA), possessing unique nano-layered structure, was designed and prepared by the neutralization reaction between phytic acid and melamine , then used as a multi-function intumescent flame retardant for epoxy resin (EP). FTIR , 1 H NMR, XRD, XPS , TGA and DSC were employed to investigate the chemical structure , growth mechanism and thermal behaviour of PAMA. SEM and TEM results confirmed the nano-layered structure of the PAMA. The limiting oxygen index (LOI) of EP incorporated with 6 wt% PAMA (EP-6) was 29.7%, and the UL-94 V-0 rating was also achieved. In contrast to the EP, the peak heat release rate (PHRR), total smoke production (TSP), and fire growth rate (FIGRA) of EP-6 were reduced by 62.3, 36.2, and 62.16%, respectively. The flame retardant mechanism of PAMA was further depicted using TG-FTIR and SEM/EDX techniques. In addition, the mechanical properties of EP composites are reinforced by the incorporation of PAMA. All the results demonstrate that the nano-layered PAMA is a high-efficient and eco-friendly fire retardant for EP.
研究领域:
材料科学
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化学工程
✓ 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）