JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Qi Wang,Chenlu Zhang,Hong Wu,Qiaoyuan Gao,Ran Duan,Chuncheng Chen
Bi 2 O 2 CO 3 was co-decorated by β-phase AgI and Bi 2 O 3 forming visible-light-active AgI(β)/Bi 2 O 3 (β)-Bi 2 O 2 CO 3 composite via simply calcining AgI/Bi 2 O 2 CO 3 . The calcination temperature and time played vital role in regulating the structure as well as photocatalytic performance. Optimal AgI(β)/Bi 2 O 3 (β)-Bi 2 O 2 CO 3 was obtained after 325 ◦ C calcination for 2 h with 5% AgI. The ratio of Bi 2 O 3 to Bi 2 O 2 CO 3 was estimated to be ca. 3:1 on the catalyst surface. The transformation process for n -type Bi 2 O 2 CO 3 to p-type Bi 2 O 3 (β) was monitored and verified by flat band potential measurements. Due to the presence of p-n junctions between p-type Bi 2 O 3 (β), n -type AgI(β) and Bi 2 O 2 CO 3 , the optimized ternary composite displayed enhanced photocurrent density and reduced charge transfer resistance, which were beneficial for photocatalytic applications. Despite of decreased specific surface area, dramatically enhanced photocatalytic performance can be observed for simultaneous removal of Cr(VI) and phenol . For example, the estimated k Cr(VI) and k phenol on AgI(β)/Bi 2 O 3 (β)-Bi 2 O 2 CO 3 were 3.3 and 2.2 times relative to those on uncalcined AgI/Bi 2 O 2 CO 3 , respectively. The optimized composite also displayed good stability in 4 successive cyclic runs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Zhefu Li,Binling Chen,Xianfeng Wang,Jun Nie,Guiping Ma
In this work, a novel catalyst of oxygen reduction reaction (ORR) was designed and fabricated by electrospinning, photo-curing and carbonization, based on polymer poly(dimethylsilylene ethynylenephenyleneethynylene) (PMSEPE) and metal organic frameworks (MOFs)—Materiaux de l'Institute Lavosier-101(Fe) (MIL-101(Fe)). The optimal catalyst PMSEPE/MIL-101(Fe)-800, which was carbonized at 800 °C, presented a bamboo-like nanofiber structure with a high degree of graphitization, a high specific surface area (302.3 m 2 /g) and a high yield (64.17%). Fe 3 C particles were found to be encapsulated into the Fe-Si-N co-doped carbon nanofibers. In the electrochemical tests, PMSEPE/MIL-101(Fe)-800 showed an onset potential of 0.935 V ( vs . RHE) and a diffusion limit current of 6.01 mA/cm 2 ( vs . RHE) in 0.1 M KOH aqueous solution, of which performances are competitive to commercial 20 wt% Pt/C. PMSEPE/MIL-101(Fe)-800 also exhibited a higher methanol tolerance and duration stability. Further Zn-air battery test used by PMSEPE/MIL-101(Fe)-800 suggested its potential for the application of fuel cell.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 319
·期 3
·1119-1125
·
IF 1.186
Wang Yunhan,Song Hu,Wang Guanquan,Yang Xia,Wang Jing,Wei Hongyuan
In this study, we successfully synthesized polyethylene glycol (PEG) and folic acid (FA) co-functionalized graphene quantum dots (GQDs) to improve the biocompatibility and tumor-targeting ability of GQDs simultaneously, and labeled GQDs–PEG–FA with 131 I for biological behavior evaluation. The in vitro properties, biodistribution and SPECT imaging of 131 I-GQDs–PEG–FA were investigated. The uptake of 131 I-GQDs–PEG–FA at tumor sites can be clearly examined via SPECT imaging, which can ascribe to enhanced permeability and retention effect and active targeting effect of FA to folate receptors. The results indicate that 131 I-GQDs–PEG–FA can be used as a radioactive probe for detection of tumor cells overexpressing folate receptor.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
·
2019
·
IF 1.786
Junjie Ding,Feng Ye,Qiang Liu,Chunping Yang,Ye Gao,Biao Zhang
It is generally accepted that matrix pores in the hollow glass microspheres (HGMs)/resin-based composites prepared using stir-casting method (SCM) seriously affect its performance. In this paper, HGMs preforms were prepared using sintering method, and co-continuous HGMs/epoxy resin syntactic foams were prepared using vacuum resin transfer molding (VARTM) method. In order to compare how preparation method affects properties of the composites, the same volume fraction of HGMs filled epoxy resin composites was prepared by SCM. The effects of preparation methods on microstructure, density, compression properties and water absorption of composites were investigated. Compression deformation mechanism of the composites prepared by two methods is discussed. Syntactic foam with the same HGMs volume fraction contained different porosity depending on the preparation method. Porosity of the matrix in the composite prepared using SCM was ∼10 vol.%, while the densities of composites prepared by VARTM were close to the theoretical density, indicating no matrix pores. Co-continuous HGMs/epoxy resin syntactic foams prepared using VARTM showed properties superior to syntactic foams prepared by SCM: compressive strength increase by 45.31%, compressive modulus increase by 37.63%, and water absorption decrease by 69.91%. All these properties improved mainly because of the elimination of the matrix pores.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Fei Xie,Yang Chen,Minyu Bai,Pinglu Wang
In the present work, a Co-substituted LiZnTiBi (Li 0.43 Zn 0.27 Co x Ti 0.13 Fe 2.167-x Bi 0.003 O 4 ) ferrite with equivalent permeability and permittivity was prepared by a low-temperature sintering method. In detail, the LiZnTiBi ferrite with high permeability was obtained by a solid phase method. Next, different mass of Co 2 O 3 (x = 0.100, 0.125, 0.150, 0.175 and 0.200) were added to reduce permeability ( μ r ’ ) and enhance cut-off frequency ( f r ) of the ferrite. Results indicated that the Co-substituted LiZnTiBi ferrite with equivalent permeability and permittivity ( μ r ’ = ε r ’ = ∼12.3) was obtained when additive amount of Co 2 O 3 (x) is around 0.150. Meanwhile, the cut-off frequency ( f r ) of the ferrite is more than 500 MHz. Also, the influences of Co 2 O 3 additive on the microstructure and phase structure of the LiZnTiBi ferrite have been investigated and discussed. SEM images indicated that the Co-substituted LiZnTiBi ferrites possess uniform and compact grains (average grain size is ∼1 μm). XRD patterns demonstrated that the LiZnTiBi ferrite material has a pure spinel structure. Rietveld refinement of XRD proved that Fe 3+ is substituted by Co 3+ . And energy dispersive spectrometer (EDS) result indicated that the Co element is existed in ferrite grains. Such a low-temperature sintering ferrite substrate material with equivalent permeability and permittivity at high frequency (@500 MHz) should also be an alternative material for microwave devices, especially for miniature antenna.
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 11
·5485-5494
·
IF 2.289
Wang Xiaoqing,Tian Songran,Zhang Xiaoqing,Li Guoyan,Liu Ying,Chen Botao,Cheng Bowen
A 3D Ni 3 S 2 @Mn-Co-OH/NF cross-linked nanosheet heterostructure composite electrode has been successfully fabricated by a facile two-step hydrothermal method. The as-prepared Ni 3 S 2 @Mn-Co-OH/NF composite electrode exhibits a high capacitance (3163 F g −1 at a current density of 3 mA cm −2 ), a superior rate performance (2071 F g −1 at a current rate of 30 mA cm −2 ), and stable cycling property (maintaining 96.6% of the initial capacitance after 4000 cycles at a current rate of 10 mA cm −2 ). This excellent electrochemical performance can be ascribed to the unique cross-linked nanosheet heterostructure formed directly on Ni foam current collector and the synergistic effect between Mn-Co-OH and Ni 3 S 2 of the composite electrode.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED SYNTHESIS & CATALYSIS
·
2019
·Vol. 361
·期 15
·3525-3531
·
IF 5.451
Jitao Wang,Xiaochun Yu,Chongyang Shi,Dajie Lin,Jun Li,Huile Jin,Xian Chen,Shun Wang
A facile fabrication of Fe and N co-doped mesoporous carbon (MC), as an efficient heterogeneous catalyst for the highly selective reduction of nitroarenes, is described. The Fe and N co-doped MC nanosheets are easily synthesized via a hydrothermal reaction between citrate acid and magnesium citrate, followed by calcination in the presence of melamine and potassium ferrocyanide. The Fe−N complex provides a unique active site for the selective reduction of 1-chloro-4-nitrobenzene, leading to the production of (E)-1,2-bis(4-chlorophenyl)diazene with a selectivity of >96%, in <40 mins. Control experiments based on non-doped, N-doped, and Fe-doped MC nanosheets demonstrate that selectivity greatly depends on the catalyst active component type, and that non-doped MC significantly contributes to the high efficiencies observed in the selective synthesis of azoxy compound intermediates. A broad range of substrates, including extra-functional groups on the nitroarenes rings, were successfully converted to the corresponding azo compounds at mild conditions with high selectivity.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Guoru Li,Xiaobo He,Fengxiang Yin,Biaohua Chen,Huaqiang Yin
The development of highly efficient electrocatalysts with low cost for oxygen reduction reaction (ORR) is urgently required for metal-air batteries and fuel cells. In this work, Fe Co/MIL-101(Cr) with various molar ratios of Fe/Co as hybrid catalysts was prepared by a facile and mild impregnation method. MIL-101(Cr) increased the specific surface areas of the hybrid catalysts, thus improving the dispersion of Fe and Co species at their surfaces. The effects of Fe and Co species on ORR activity of the hybrid catalysts were investigated. It is found that the synergistic effects between the well-dispersed Fe and Co species contribute mainly to ORR activity. More specifically, Fe species exert a partial-charge-transfer-activation effect on Co ones, which reduces the charge transfer resistance and thus improves the catalytic activity . As a result, Fe Co/MIL-101(Cr) showed the excellent ORR activity, in which Co 50 Fe 50 /MIL-101(Cr) exhibited the superior ORR activity to the other prepared hybrid catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 6
·5866-5873
·
IF 2.195
Zhu Chengyi,Liu Jianxiong,Yu Xiaohua,Zhang Yannan,Zhang Yingjie,Jiang Xiaodong,Wang Sai,Wang Qiang,Dong Peng
Co-doped Li 4 Ti 5 O 12 nanosheets are synthesized via a facile hydrothermal method assisted by mechanical activation technology. The as-prepared Co-doped Li 4 Ti 5 O 12 is characterized by X-ray diffraction, scanning electron microscope and transmission electron microscopy. The morphology measurement shows that the Co-doped Li 4 Ti 5 O 12 still maintain the three-dimensional nanosheet structures and good crystallinity after Co doping. As we expected, Co-doped Li 4 Ti 5 O 12 exhibits higher initial discharge specific capacity, improved cycling performance, and impressive rate capability compared with pristine Li 4 Ti 5 O 12 nanosheets. Even under 20 °C charge/discharge rates, the initial discharge capacity of Co-doped Li 4 Ti 5 O 12 is up to 106 mAh g −1 . The electrochemical impedance spectra measurement further displays that the charge-transfer resistance of Co-doped Li 4 Ti 5 O 12 is much lower than that of pristine one after 20 cycles. The improved electrochemical performance of Co-doped Li 4 Ti 5 O 12 is mainly because the Co doping can effectively enlarge the size of the channel by altering the lattice parameter, which can facilitate Li + diffusion and electron transportation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Lan Wang,Xiaoyan Shu,Facheng Yi,Dadong Shao,Kuibao Zhang,Haibin Zhang,Xirui Lu
A series of Nd and Ce co-doped Gd 2- x Nd x Zr 2- y Ce y O 7 (0.0 ≤ x , y ≤ 2.0) ceramics were rapidly fabricated through spark plasma sintering (SPS) within 3 min. The effects of Nd and Ce contents on the phase composition, lattice parameter , active modes, microtopography and microstructure have been investigated in detail. XRD studies reveal that the compositions corresponding to 0.0 ≤ y ≤ 1.0 show a single phase and beyond 1.0 exhibit multiphase. The lattice parameters increase with elevated Nd and Ce content. The grains are densely packed on each other with cube-like shape, and the elements are almost homogeneously distributed in the compound. This synthetic method provides a simple pathway for the preparation of highly densified single phase ceramic at 1600–1700 ℃ for 3 min under pressure of 80 MPa.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Bangbang Wang,Enzhu Hu,Zhiqiang Tu,Karl Dearn David,Kunhong Hu,Xianguo Hu,Wei Yang,Jianhua Guo,Weimeng Cai,Wenli Qian,Hao Zhang
A novel carbon nanoparticle co-doped with sulfur and nitrogen (S, N CN) was prepared from rice husk powder through a hydrothermal reaction. A series of modern analysis techniques was utilized to characterize the morphology, structure, and components of the S, N CN nanoparticles. Their tribological properties as a lubricating additive to polyethylene glycol (PEG200) base oil were investigated using a UMT-2 sliding tribometer. Results showed that the average diameter of nanoparticles were approximately 16 nm. The nanoparticles mainly included C, O, N, and S. The I D /I G value of S, N CN was 2.63. PEG200 that included different contents of S, N CN displayed remarkable lubricating performance compared with pure PEG200 under different loads (8, 20, 40, and 100 N). When 0.1 wt% S, N CN was dispersed in base oil, the friction coefficient and wear rate decreased by 16.6% and 75.9%, respectively. The friction and wear mechanisms were attributed to robust tribo-films that had developed as a result of tribo-chemical reactions induced by the S, N CN particles, comprising nitrides, sulfides, and metal oxides to promote wear resistance and friction reduction properties of PEG200.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 33
·8958-8965
·
IF 5.976
Jing Wang,Aisen Li,Shuping Xu,Bao Li,Chongping Song,Yijia Geng,Ning Chu,Jian He,Weiqing Xu
Continuous tunable photoemission of a novel co-crystal (9-acetylanthracene-tetrafluoroterephthalonitrile, 9ACA-TFP) depending on intermolecular charge transfer (CT) is achieved in situ under high pressure via a diamond anvil cell. Compared with other methods for tuning the emission of organic co-crystals based on organic synthesis or doped organic co-crystals, this pressure-based tuning method is simple and effective. The high-pressure data show that this organic co-crystal (9ACA-TFP) exhibits continuous redshifts in its emission bands (from 490 to 620 nm) with the pressure increasing, and its colour and emission bands can recover to their initial state once the pressure is completely released. Raman and ultraviolet-visible absorption spectra with pressure were also measured. All Raman vibrational bands move to higher wavenumbers and exhibit decreased intensities with pressure, proving that the shortened bond lengths and donor–acceptor–donor (D–A–D) interplanar distance result in stronger intermolecular interactions. The in situ absorption spectra of the 9ACA-TFP co-crystal show a 134 nm redshift from 0 to 7.22 GPa, indicating that high pressure enhances the intermolecular CT transition between D and A. The co-crystal materials show on/off switching of photoemission upon cycling compression and decompression. This study is of sigificance in determining the intermolecular CT interaction –photoemission property relation of organic co-crystals.
✓ 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）