JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2018
·
IF 1.946
Linna Sha,Peng Gao,Xiaobo Li,Xuefeng Bai
In this work, amorphous CoB has been uniformly coated on C 60 surfaces through a simple ball milling process. Accordingly their XRD , SEM and TEM measurements clarify their related composite structures. Especially, a C-B chemical bond has been found through its XPS measurement, which enhanced the composite's stability and electrochemical activity. And the following electrochemical experimental results demonstrated that the as-obtained C 60 /CoB composite had considerably high storage capacities of 602 mA h/g, which were much higher than those of individual C 60 and CoB. Furthermore their hydrogen storage processes and the mechanism have also been investigated.
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Polymers
·
2018
·Vol. 10
·期 3
·298
·
IF 2.935
Zhiling Li,Ping Guan,Xiaoling Hu,Shichao Ding,Yuan Tian,Yarong Xu,Liwei Qian
Molecularly imprinted mesoporous materials (MIMs) were synthesized to improve the adsorption performance of Cytochrome c (Cyt c) by using an imidazolium-based amphiphilic ionic liquid 1-octadecyl-3-methylimidazolium chloride (C18MIMCl) as surfactant in aqueous solution via the epitope imprinting approach. The surface-exposed C-terminus nonapeptide of Cyt c (residues 96–104, AYLKKATNE) was utilized as the imprinted template. The nitrogen adsorption-desorption, thermo-gravimetric analysis, and transmission electron microscopy verified the successful preparation of MIMs with ordered mesoporous structure. The adsorption isotherm studies showed that the obtained MIMs exhibited superior adsorption capacity toward Cyt c of 86.47 mg·g−1because of the high specific surface areas of 824 m2·g−1, and the appropriate pore size promoted the mass transfer of Cyt c, causing a rapid adsorption equilibrium within 20 min. Furthermore, these MIMs still remained excellent selectivity and recognition ability according to the selective as well as the competitive adsorption studies, suggesting that the molecularly imprinted mesoporous materials is expected to be used in the field of highly efficient separation and enrichment of proteins.Keywords:amphiphilic ionic liquids;molecularly imprinted mesoporous silica;epitope imprinting;Cytochrome c
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Yan Sun,Peigen Zhang,Bo Wang,Jing Wu,Shanshan Ning,Anjian Xie,Yuhua Shen
Cu-MOF with a hollow morphology was successfully synthesized by a novel and simple coordination transformation reaction of [Cu(NH 3 ) 4 ] 2+ with benzenetricarboxylic acid (H 3 BTC) under ultrasound irradiation for the first time. Then, novel hollow porous CuO/C nanorods were prepared by calcining this Cu-MOF at low temperature (250 °C) in air. The morphology and electrochemical properties of the samples were markedly affected by the calcination temperature. As anode materials for lithium-ion batteries, the hollow porous nanorod structure and the presence of carbon greatly enhanced the electrochemical performance of the CuO/C nanocomposite. The reversible specific capacity of CuO/C was 505 mA h g −1 at a current density of 100 mA g −1 after 200 cycles, which is much higher than that of the CuO samples calcined at 300 °C and 350 °C (250.1 mA h g −1 and 192.3 mA h g −1 , respectively) in air. The CuO/C nanocomposite also exhibited a more favorable rate capability than CuO. The superior electrochemical performance makes this nanocomposite a promising anode material for LIBs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 7
·5954-5960
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IF 2.324
Wang Yan,Wang Yishu,Han Jing,Tan Shihai,Guo Fu
Sn grain orientation in solder matrix has recently been considered as one of the principal failure contributions in lead-free solder joints. Since β -Sn exhibits high anisotropy, the differences of electromigration behavior of solder joints with various grain orientations are dramatic. With different angle ( θ ) between the c -axis of Sn grain and the direction of electron flow, the solder joints often demonstrate varying degrees of electromigration-induced damage. The present investigation illustrated significant differences in microstructural features on the surface of Cu reinforced composite solder joints, even with similar angle θ . Two Cu particles reinforced Sn 3.5 Ag composite solder joints with the similar angle θ of 35° and 40° were selected to investigate the effects of Sn grain c -axis on electromigration under high current stressing for 528 h. A large number of Cu 6 Sn 5 compounds were observed and occupied nearly the whole surface with clear polarization effect in one sample. In contrast, very few Cu 6 Sn 5 were found on the surface of the solder matrix in the other sample after current stressing, and the Cu 6 Sn 5 which was formed after reflow disappeared with subsequent current stressing. Even though polarization effect was not obvious, and the cathode interfacial dissolution was observed on such sample. Systematic study revealed that the angle θ alone was not a sole factor to determine the electromigration damage. It has to be considered along with the coordinate system containing the orientation of the c -axis of the Sn grain, a more dominative factor for the diffusing species.
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MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Xing Liu,Yunhong Jiang,Kefeng Li,Fu Xu,Ping Zhang,Yanhuai Ding
Electrochemically active SnO 2 materials are prospective alternatives for graphite toward better flexible LIBs. However, significant volume changes and structural pulverization restrict the cycling stability and high capacity of SnO 2 . Here, we report a binder and conductive additive free core-shell N-doped carbon @SnO 2 hybrid paper by a subtle coaxial-electrospinning method. Core-shell N-doped C@SnO 2 fibers not only offer rapid ionic transport and sufficient buffer space for the volume expansion during the Li insertion and extraction reactions, but also enable high flexibility against both compression and bending deformation. As an anode for LIBs, the hybrid materials delivered a large initial capacity of 1799 mAhg −1 with capacity retention of 729 mAhg −1 after 100 cycles at a current rate of 390.5 mAg −1 . More importantly, flexible N-doped C@SnO 2 fabrics exhibit excellent electrochemical performance even after a rough treatment, suggesting a facile strategy for the fabrication of electrochemically stable electrodes for flexible LIBs.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Qingtang Zhang,Chao Yan,Yan Meng,Xiaomei Wang
Hierarchical mesoporous Li 2 FeSiO 4 /C sheaf-rods (HMLFS-SRs) were fabricated using a hard template method with SBA-15 as a silicon source. For comparision, Li 2 FeSiO 4 /C nanocomposites (LFS) were prepared using nano-SiO 2 under the same conditions. XRD results prove that both the HMLFS-SRs and LFS contain crystalline Li 2 FeSiO 4 and trace amounts of Fe 3 O 4 impurities. The SEM and TEM images indicate that the HMLFS-SRs are hierarchical sheaf rods composed of nanoparticles . EDS data prove that elemental Fe, Si, O and C are uniformly distributed throughout the whole Li 2 FeSiO 4 /C sheaf rod. Nitrogen adsorption/desorption analyses further indicate that the HMLFS-SRs are typical mesoporous materials with an external surface area of 47 m 2 g −1 , which is higher than that of the LFS (31 m 2 g −1 ). These unique structures enable the HMLFS-SRs to exhibit much better electrochemical performance than the LFS. The HMLFS-SRs deliver a high discharge capacity of 206.6 mAh g −1 at 0.1 C. In addition, the HMLFS-SRs also have good cycling performance, satisfactory rate performance, a low charge transfer resistance and a large lithium-ion diffusion coefficient .
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Zhuo Bian,Ang Li,Renyue He,Huaihe Song,Xiaohong Chen,Jisheng Zhou,Zhaokun Ma
Metal-organic frameworks can provide excellent templates for the preparation of nanomaterials for green energy storage. However, it is still a formidable challenge for the synthesis of MOF-templated Sn-based nanomaterials with controllable morphologies and structures. Here, Sn-based MOFs with different morphologies are synthesized by a facial and controllable method, then SnO/C polyhedrons with shapes of cube and stellated octahedron are obtained using the Sn-based MOFs as template by further heat treatment, respectively. Benefited from the composite structures, the SnO/C polyhedrons exhibit excellent electrochemical performances in lithium storage. A high reversible capacity of 950 mA h g −1 is obtained at a current density of 50 mA g −1 after 100 cycles, together with superior cyclic stability and remarkable rate capacity. This paper provides an effective route to prepare high-performance Sn-based anode materials from the morphology-controlled MOFs for lithium-ion batteries.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 33
·1902875
·
IF 15.621
Zhichao Wang,Wenjia Xu,Xiaokang Chen,Yanhua Peng,Yanyan Song,Chunxiao Lv,Hongli Liu,Junwei Sun,Ding Yuan,Xiyan Li,Xiangxin Guo,Dongjiang Yang,Lixue Zhang
Heteroatom doping plays a significant role in optimizing the catalytic performance of electrocatalysts. However, research on heteroatom doped electrocatalysts with abundant defects and well-defined morphology remain a great challenge. Herein, a class of defect-engineered nitrogen-doped Co 3 O 4 nanoparticles/nitrogen-doped carbon framework (N-Co 3 O 4 @NC) strongly coupled porous nanocubes, made using a zeolitic imidazolate framework-67 via a controllable N-doping strategy, is demonstrated for achieving remarkable oxygen evolution reaction (OER) catalysis. X-ray photoelectron spectroscopy, X-ray absorption fine structure, and electron spin resonance results clearly reveal the formation of a considerable amount of nitrogen dopants and oxygen vacancies in N-Co 3 O 4 @NC. The defect engineering of N-Co 3 O 4 @NC makes it exhibit an overpotential of only 266 mV to reach 10 mA cm −2 , a low Tafel slope of 54.9 mV dec −1 and superior catalytic stability for OER, which is comparable to that of commercial RuO 2 . Density functional theory calculations indicate N-doping could promote catalytic activity via improving electronic conductivity, accelerating reaction kinetics, and optimizing the adsorption energy for intermediates of OER. Interestingly, N-Co 3 O 4 @NC also shows a superior oxygen reduction reaction activity, making it a bifunctional electrocatalyst for zinc–air batteries. The zinc–air battery with the N-Co 3 O 4 @NC cathode demonstrates superior efficiency and durability, showing the feasibility of N-Co 3 O 4 /NC in electrochemical energy devices.
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Materials
·
2019
·Vol. 12
·期 17
·2813
·
IF 2.972
Haijuan Li,Ling Li,Shuaizhi Zheng,Xinming Wang,Zengsheng Ma
To improve the thermal shrinkage and ionic conductivity of the separator for lithium-ion batteries, adding carboxylic titanium dioxide nanofiber materials into the matrix is proposed as an effective strategy. In this regard, a poly(vinylidene fluoride-hexafluoro propylene)/dibutyl phthalate/carboxylic titanium dioxide (PVDF-HFP/DBP/C-TiO2) composite separator is prepared with the phase inversion method. When the content of TiO2nanofibers reaches 5%, the electrochemical performance of the battery and ion conductivity of the separator are optimal. The PVDF-HFP/DBP/C-TiO2(5%) composite separator shows about 55.5% of porosity and 277.9% of electrolyte uptake. The PVDF-HFP/DBP/C-TiO2(5%) composite separator has a superior ionic conductivity of 1.26 × 10−3S cm−1and lower interface impedance at room temperature, which brings about better cycle and rate performance. In addition, the cell assembled with a PVDF-HFP/DBP/C-TiO2separator can be charged or discharged normally and has an outstanding discharge capacity of about 150 mAh g−1at 110 °C. The battery assembled with the PVDF-HFP/DBP/C-TiO2composite separator exhibits excellent electrochemical performance under high and room temperature environments.Keywords:TiO2nanofiber;PVDF-HFP;composite separator;phase inversion;thermal shrinkage;ionic conductivity
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xianfeng Meng,Shenhui Dong
C/Co composites are promising materials for electromagnetic (EM) wave absorption. In this work, C/Co nanofibres were synthesised via a facile electrospinning method followed by an in situ reduction process. The results indicate that the heterogeneous structure and Co content play a vital role in determining the EM wave absorption performance of the C/Co nanofibres. At 15 wt% Co content, the C/Co nanofibres exhibit optimal impedance matching and attenuation ability, and the minimum reflection loss for the sample with thickness 3.5 mm is −58.8 dB. The effective absorption bandwidth reaches 12.9 GHz in the range of 2–18 GHz, which partially and completely covers the C and X-Ku bands, respectively. The EM wave absorption mechanism based on the conductive, dielectric , and magnetic losses is discussed in detail. The results indicate that the C/Co nanofibres possess significant potential for microwave absorption applications.
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ACS Nano
·
2017
·
IF 13.942
Guodong Zou,Qingrui Zhang,Carlos Fernandez,Gang Huang,Jianyu Huang,Qiuming Peng
Rational design of heterogeneous electrode materials with hierarchical architecture is a potential approach to significantly improve their energy densities. Herein, we report a tailored microwave-assisted synthetic strategy to create heterogeneous hierarchical Ti3SiC2@C-containing Na2Ti7O15 (MAX@C-NTO) composites as potential anode materials for high-performance sodium storage in a wide temperature range from 25 to 80 °C. This composite delivers first reversible capacities of 230 mAh g–1 at 200 mA g–1 and 149 mAh g–1 at 3000 mA g–1 at 25 °C. A high capacity of ∼93 mAh g–1 without any apparent decay even after more than 10 000 cycles is obtained at an ultrahigh current density of 10 000 mA g–1. Moreover, both a high reversible capacity and an ultralong durable stability are achieved below 60 °C for the same composites, wherein a 75.2% capacity retention (∼120 mAh g–1 at 10 000 mA g–1) is achieved after 3000 cycles at 60 °C. To the best of our knowledge, both the sodium storage performances and the temperature tolerances outperform those of all the Ti-based sodium storage materials reported so far. The superior sodium storage performances of the as-synthesized composites are attributed to the heterogeneous core–shell architecture, which not only provides fast kinetics by high pseudocapacitance but also prolongs cycling life by preventing particle agglomeration and facilitates the transportation of electrons and sodium ions by large micro/mesopore structure.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Chao Cui,Gang Zhou,Weifeng Wei,Libao Chen,Chengchao Li,Jianling Yue
In this work, a facile strategy for embedding graphene (GR) nanosheets into carbon-coated MoSe 2 (MoSe 2 @C@GR) hybrid nanofibers has been developed by a simple electrospinning route. One dimensional nanofibers have excellent structural stability resulting from strong tolerance to stress change. The highly conductive graphene nanosheets play an excellent coating effect on MoSe 2 to inhibit the growth of MoSe 2 nanosheets on the nanofiber surface and enhance the conductivity of hybrid nanofibers, which substantially improves the rate performance and cycle stability of carbon-coated MoSe 2 (MoSe 2 @C) nanofibers. In particular, the MoSe 2 @C@GR electrode delivers a high discharge capacity of 366.9 mAh g −1 after 200 cycles at 0.2 A g −1 , meanwhile exhibits superior rate performance. The analysis of Nyquist plots reveals that the addition of graphene nanosheets can greatly strengthen the kinetics of electrode reaction and the electrochemical activity.
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