Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: January 2023
Authors: Yao Yao Li, Yin Hu, Cheng Tao Yang
Regulating Li+ Transfer and Solvation Structure via Metal-Organic Framework for Stable Li Anode
Yaoyao Li1,a, Yin Hu1,b and Chengtao Yang1,c*
1State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
a446768586@qq.com, byhu426@uestc.edu.cn, cctyang@uestc.edu.cn
Keywords: Li metal anode, ion transfer, metal-organic framework, Li+ solvation
Abstract.
Herein, a metal-organic framework (MOF), i.e., ZIF-8, is applied to regulate Li+ solvation structure via unsaturated metal-ion sites to achieve uniform Li+ distribution and Li deposition.
To demonstrate the capability of MOFs on anion adsorption and ion-distribution regulation, a MOF material with stable structure, i.e., ZIF-8, has been applied as electrolyte additive in Li symmetrical cell to realize uniform Li deposition.
Results and Discussion The crystal phase, structure and morphology of ZIF-8 particles were firstly characterized to ensure the successful synthesis process.
Zhang, Lithiophilicity chemistry of heteroatom-doped carbon to guide uniform lithium nucleation in lithium metal anodes, Sci.
Herein, a metal-organic framework (MOF), i.e., ZIF-8, is applied to regulate Li+ solvation structure via unsaturated metal-ion sites to achieve uniform Li+ distribution and Li deposition.
To demonstrate the capability of MOFs on anion adsorption and ion-distribution regulation, a MOF material with stable structure, i.e., ZIF-8, has been applied as electrolyte additive in Li symmetrical cell to realize uniform Li deposition.
Results and Discussion The crystal phase, structure and morphology of ZIF-8 particles were firstly characterized to ensure the successful synthesis process.
Zhang, Lithiophilicity chemistry of heteroatom-doped carbon to guide uniform lithium nucleation in lithium metal anodes, Sci.
Online since: July 2012
Authors: Chuan Guo Ma, Ming Liu
The blend with 10 pbw (parts by weight) PS presented an EP continuous phase structure, and both blends with 20 pbw and 30 pbw developed into a bi-continuous phase structure.
Especially, structure and electrical properties of the CPC were studied.
The conductive behaviors of the blends still obey the percolation principle, and the blend with EP continuous phase structure has a lower percolation threshold than the blends with bi-continuous phase structure, which was attributed to the defects in the bi-continuous phase structure.
The ε of the blends with bi-continuous phase structure show stronger frequency dependences, and are higher than with EP continuous phase structure at the low frequency region.
Wu: Materials Chemistry and Physics Vol. 104(2007), p.240
Especially, structure and electrical properties of the CPC were studied.
The conductive behaviors of the blends still obey the percolation principle, and the blend with EP continuous phase structure has a lower percolation threshold than the blends with bi-continuous phase structure, which was attributed to the defects in the bi-continuous phase structure.
The ε of the blends with bi-continuous phase structure show stronger frequency dependences, and are higher than with EP continuous phase structure at the low frequency region.
Wu: Materials Chemistry and Physics Vol. 104(2007), p.240
Online since: June 2007
Authors: Jong K. Lee, Suk Jung Choi, Su Hee Hong, Kee S. Moon, Yong K. Hong, Byung Hak Choe, Soo Keun Shin
The diffraction p
attern is indexed on the basis of pseudocubic structure[10].
Whether the tweed structure shown in Fig. 1 is indeed due to coherency strain needs a further study.
A schematic for a modulated structure with 5a superlattice composed of dimers and trimers.
(a) Basic unit board, (b) Superlattice diffraction at z = <001> and spot streaks including diffuse scattering along y = <010>, (c) Tweed structure separated at tens of nanometers, and (d) Wavy modulated structure of spherical domains.
When such an arrangement of dimers and trimers is extended to the z direction and thus the lattice displacements are viewed in 3 dimension, both a tweed structure (Fig.3c.) and a wavy modulated structure of tiny spherical domains (Fig.3d.) can be expected.
Whether the tweed structure shown in Fig. 1 is indeed due to coherency strain needs a further study.
A schematic for a modulated structure with 5a superlattice composed of dimers and trimers.
(a) Basic unit board, (b) Superlattice diffraction at z = <001> and spot streaks including diffuse scattering along y = <010>, (c) Tweed structure separated at tens of nanometers, and (d) Wavy modulated structure of spherical domains.
When such an arrangement of dimers and trimers is extended to the z direction and thus the lattice displacements are viewed in 3 dimension, both a tweed structure (Fig.3c.) and a wavy modulated structure of tiny spherical domains (Fig.3d.) can be expected.
Online since: June 2011
Authors: Hai Bo Yang, Fen Wang, Guo Quan Qi, Jian Feng Zhu
Effect of composite additives on ZnO varistor ceramics
Jianfeng Zhua, Guoquan Qib, Haibo Yang and Fen Wang
Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education
Shanxi University of Science & Technology, Xi’an 710021, China
azhujf@sust.edu.cn, bqgqstar@163.com
Key words: ZnO; varistors; additives; microstructure; electrical properties.
The microscopic structure and composition were analyzed by SEM and XRD respectively, and the electrical properties were investigated by a DC parameter instrument for varistors.
Both methods yielded a homogenous fine mixed powder due to the more refined grain size of the composite additives and the more uniform mixture of the composition structure.
The pyrogenic decomposition was deemed the preferable option for preparing the varistors due to its favorable microscopic structure and optimum electrical properties: a varistor voltage of 561 V/mm, a non-linear coefficient of 75, and a leakage current (IL) of 0.45 µA.
The microscopic structure and composition were analyzed by SEM and XRD respectively, and the electrical properties were investigated by a DC parameter instrument for varistors.
Both methods yielded a homogenous fine mixed powder due to the more refined grain size of the composite additives and the more uniform mixture of the composition structure.
The pyrogenic decomposition was deemed the preferable option for preparing the varistors due to its favorable microscopic structure and optimum electrical properties: a varistor voltage of 561 V/mm, a non-linear coefficient of 75, and a leakage current (IL) of 0.45 µA.
Online since: January 2015
Authors: Yu Mei Gong, Hong Zhang, Jing Guo, Si Yang Mu, Chun Fang Yu
The composition and structure of the grafts and cellulose, phase transition properties and morphology of grafts were investigated by Fourier transform infrared spectrometer(FTIR), differential scaanning calorimentry(DSC) and optical microscopy.
The chemical structures of Cellulose and PEGA-g-CEA were characterized with a Spectrum One-B FTIR spectrometer(PerkinElmer,USA).
The above results verified that the grafting copolymerization reaction between Cellulose and PEG were successfully completed and coincided with the structure of the aimed products, which illustrated that PEG was successfully grafted on to the Cellulose through ACL as chain extender.
Part A: Pure and Applied Chemistry, Vol 47(10) (2010), p. 1042-1049 [6] A Kumar, P S.
The chemical structures of Cellulose and PEGA-g-CEA were characterized with a Spectrum One-B FTIR spectrometer(PerkinElmer,USA).
The above results verified that the grafting copolymerization reaction between Cellulose and PEG were successfully completed and coincided with the structure of the aimed products, which illustrated that PEG was successfully grafted on to the Cellulose through ACL as chain extender.
Part A: Pure and Applied Chemistry, Vol 47(10) (2010), p. 1042-1049 [6] A Kumar, P S.
Online since: June 2012
Authors: Zhi Hong Fu, Xiang Zhu He, Xin Sun, Yong Xiu Wang
The synthesized materials doping by Y exhibited standard olivine structure, nano-sized particles, discharge capacity of 122.9mAh.g-1 and good cycling performance.
Improvements in the effective reversible capacity of LiMnPO4 have been reported in these years. this was attained through various synthesis strategies that involved the coating of electronic conductive carbon on LiMnPO4 particles,metal ion doping in the Mn site , reducing the particle size and controlling the structure[4, 5].
Results and discussion The results from the XRD analysis showed in Fig. 1 indicated that all the samples are in good agreement with the standard LiMnPO4 with an ordered olivine structure indexed by orthorhombic Pnmb space group.
Paydar: Materials Chemistry and Physics,Vol 109(2008),pp.156-163
Improvements in the effective reversible capacity of LiMnPO4 have been reported in these years. this was attained through various synthesis strategies that involved the coating of electronic conductive carbon on LiMnPO4 particles,metal ion doping in the Mn site , reducing the particle size and controlling the structure[4, 5].
Results and discussion The results from the XRD analysis showed in Fig. 1 indicated that all the samples are in good agreement with the standard LiMnPO4 with an ordered olivine structure indexed by orthorhombic Pnmb space group.
Paydar: Materials Chemistry and Physics,Vol 109(2008),pp.156-163
Online since: February 2011
Authors: Li Wang, Wen Fu, Li Chen
Corrosion Characteristics of PEO Films on AZ31 Magnesium Alloys
Li Wang1, a, Li Chen 2, b, Wen Fu3, c
1, 3 College of Chemical and Environmental Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, Guangdong, China;
1, 2 College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
aemail: wanglihaha@126.com, bemail:celichen@scut.edu.cn, cemail:a449192213@163.com
Keywords: Plasma Electrolytic Oxidation; Films; Corrosion
Abstract: The aim of this work is to discuss the corrosion characteristics of plasma electrolytic oxidation (PEO) films formed on AZ31 magnesium alloys in alkaline silicate solution.
The composition, the structure and the element contents of the films after immersed in 3.5 wt.% NaCl solution for different time were investigated by XRD, SEM and EDS.
The aim of this work is to study the electrochemical corrosion properties of the PEO films and the corrosion kinetics of the films, and the relations among the types of spark discharge, the composition, the structure of the films after immersed in NaCl solution.
The cracks widened further on the surface of PEO treated samples after immersed in NaCl for 120 hours (as shown in Fig. 3(b)-6) than that of immersed for 72 hours (as shown in Fig. 3(b)-5), which may due to the prolonged immersed time that could destroy the structure of the PEO treated samples.
The composition, the structure and the element contents of the films after immersed in 3.5 wt.% NaCl solution for different time were investigated by XRD, SEM and EDS.
The aim of this work is to study the electrochemical corrosion properties of the PEO films and the corrosion kinetics of the films, and the relations among the types of spark discharge, the composition, the structure of the films after immersed in NaCl solution.
The cracks widened further on the surface of PEO treated samples after immersed in NaCl for 120 hours (as shown in Fig. 3(b)-6) than that of immersed for 72 hours (as shown in Fig. 3(b)-5), which may due to the prolonged immersed time that could destroy the structure of the PEO treated samples.
Online since: March 2014
Authors: Jian Hui Qiu, Xue Li Wu, Hui Xia Feng, Li Min Zang, Wei Yi, Wen Juan Zhang, Sakai Eiichi
Preparation and characterization of functionalized magnetic silica nanospheres with the immobilized cellulase
Wenjuan Zhang1, a, Jianhui Qiu1, b, *, Huixia Feng2, c, Xueli Wu1, d, Limin Zang1, e, Wei Yi3, f, Eiichi Sakai1, g
1 Department of Machine Intelligence and Systems Engineering, Faculty of Systems Engineering, Akita Prefectural University, Akita 015-0055, Japan
2 College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
3 Institute of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Lanzhou University, Gansu 730000, China
*Corresponding author: : Tel.
Structure of functionalized magnetic silica nanospheres were characterized by transform infrared spectroscopy (FTIR) and differential thermal analysis (DTA).
Structure of functionalized magnetic silica nanospheres were characterized by transform infrared spectroscopy (FTIR) and differential thermal analysis (DTA).
Online since: November 2010
Authors: Ren Qing Wang
The structure, morphology and luminescent properties of the phosphors were characterized by XRD, laser particle size analyzer, SEM, UV and PL-PLE spectra respectively.
The crystal structure is face-centred cubic crystal, and the space group is Fm-3m.
Fig.1 XRD patterns of the CaO:0.01Tb3+,0.02Li+ phosphors sintered at different temperatures From above, it is easy to see that Tb3+ and Li+ ions did not change the crystal structure of CaO.
Su et al.: Journal of SolidState Chemistry, Vol.167 (2002), p. 435
The crystal structure is face-centred cubic crystal, and the space group is Fm-3m.
Fig.1 XRD patterns of the CaO:0.01Tb3+,0.02Li+ phosphors sintered at different temperatures From above, it is easy to see that Tb3+ and Li+ ions did not change the crystal structure of CaO.
Su et al.: Journal of SolidState Chemistry, Vol.167 (2002), p. 435
Online since: May 2013
Authors: J. Judith Vijaya, L. John Kennedy, A. Manikandan
John Kennedy b
a Catalysis and Nanomaterials Research Laboratory, Department of Chemistry, Loyola College, Chennai 600 034, India
b Materials Division, School of Advanced Sciences, Vellore Institute of Technology
University, Chennai Campus, Chennai 600 127, India
a maniloyola1982@gmail.com, a* jjvijayaloyola@yahoo.co.in, b jklsac14@yahoo.co.in
Keywords: Nanoparticles; Ferrites; Electron microscopy; X-ray analysis; Optical properties.
X-ray analysis showed that all the compositions crystallize with cubic spinel structure.
Furthermore, there is no extra peaks for all compositions, which indicates that all the samples crystallize in single-phase cubic structure with Fd3m space group.
The band gap energy decreases with increasing Ni content, due to the difference in the electronic structure of dopant.
X-ray analysis showed that all the compositions crystallize with cubic spinel structure.
Furthermore, there is no extra peaks for all compositions, which indicates that all the samples crystallize in single-phase cubic structure with Fd3m space group.
The band gap energy decreases with increasing Ni content, due to the difference in the electronic structure of dopant.