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Nanostructured Li2FeSiO4/C is synthesized by a simple co-precipitation method.Thermodynamic calculation provides guidance for the synthesis of pure Li2FeSiO4.Li2FeSiO4/C shows high ...reversible capacity and excellent cycling performance.
Nanostructured Li2FeSiO4/C cathode material is successfully synthesized through a simple co⿿precipitation method by using Fe3+ salt as iron source and polyethylene glycol as surfactant. Thermodynamic calculation is carried out to get phase predominance diagram as functions of oxygen partial pressure and temperature for Fe⿿O⿿C system, which provides effective guidance for synthesis parameter selection of pure phase Li2FeSiO4. The synthesized Li2FeSiO4/C nanoparticles show an average size of 150nm, which are composed of ultra⿿small Li2FeSiO4 nanocrystals in 10⿿25nm dispersing in amorphous carbon matrix. The in situ formed carbon network and the Li2FeSiO4 nanocrystals provide a fast transport of electron and lithium ion and thus ensure a quick electrode reaction, leading to an excellent electrochemical performance. The synthesized Li2FeSiO4/C exhibits a specific capacity of 190mAhg⿿1 at 0.1C, realizing reversible extraction/insertion of 1.37 Li+, taking into account of 16.1wt% carbon content in the composite. This work offers a simple, scalable, and low cost approach for the synthesis of high performance Li2FeSiO4/C cathode material for lithium ion batteries.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
Ce
0.8
Sm
0.2
O
2 − δ
–LnBaCo
2
O
5 + δ
(SDC-LnBCO, Ln=La, Nd, Sm, and Y) composites were prepared and characterized as dense ceramic membranes for oxygen separation. Ce
0.8
Sm
0.2
O
2 − δ
(SDC) ...shows a good chemical compatibility with LaBaCo
2
O
5 + δ
(LBCO), NdBaCo
2
O
5 + δ
(NBCO), and SmBaCo
2
O
5 + δ
(SBCO), while a little of impurity is detected in the sample with YBaCo
2
O
5 + δ
(YBCO). The SDC-SBCO and SDC-YBCO samples exhibit larger grain size than SDC-LBCO and SDC-NBCO. The incorporation of SDC increases the structural stability and decreases the thermal expansion coefficient of LnBCO at high temperature. The oxygen permeation flux of SDC-LnBCO dual-phase membrane decreases with decreasing Ln
3+
radius, which is 2.57 × 10
−7
, 1.58 × 10
−7
, 8.05 × 10
−8
, and 7.57 × 10
−8
mol cm
−2
s
−1
at 925 °C for SDC-LBCO, SDC-NBCO, SDC-SBCO, and SDC-YBCO membranes, respectively. Increasing the flow rate of feeding and sweeping gas can create oxygen partial pressure gradient, and thus, increase the oxygen permeability. These results indicate that SDC-LBCO and SDC-NBCO composites are promising candidates for oxygen permeation membrane.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Ladder‐type polyacene (FP2) and model compounds (1c and 2c) with perylene‐fused‐pyrene structures are achieved in high yields by using a Pd(PPh3)2Cl2‐catalyzed Suzuki reaction followed by cyclization ...with FeCl3. The obtained model compounds and polyacene display desirable solubility in commonly used solvents and high thermal stability. Fluorescence peak at 614 nm is observed in diluted CH2Cl2 solution containing polyacene. Furthermore, the as‐prepared model compound (2c) and polyacene (FP2) are employed as acceptors in bulk‐heterojunction (BHJ) solar cells with PTB7‐Th as electrodonor cells. The 2c‐based solar cell demonstrates a power conversion efficiency of 3.25%.
Ladder‐type polyacene (FP2) and model compounds (1c and 2c) with perylene‐fused‐pyrene structures are acheived in high yields by using a Pd(PPh3)2Cl2‐catalyzed Suzuki reaction. Fluorescence peak at 614 nm is observed in diluted CH2Cl2 solution containing polyacene. The model compound‐based solar cell demonstrates a power conversion efficiency of 3.25%.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
BaCo0.7Fe0.3−xInxO3−δ (BCFI, x=0–0.20) materials, which are considered for application in oxygen separation technology, were prepared by conventional, solid-state reaction process. It was found that ...doping of indium in x=0.10–0.20 range stabilizes the cubic, perovskite-type structure at ambient temperature. Comprehensive studies were performed considering influence of indium content in BCFI oxides on electrical conductivity, oxygen nonstoichiometry, oxygen permeation behavior and structural stability of the materials. With increasing In content, oxygen vacancy concentration increases, while at the same time, electrical conductivity is found to decrease. Also, the oxygen permeability decreases with increasing In-doping level, which is due to the narrowing of the critical radius and the increasing of the activation energy of oxygen migration. This correlation was further elucidated by first principles calculations. From a point of view of application, incorporation of In enhances structural stability of the compounds in reducing atmospheres, and also, membranes with BaCo0.7Fe0.2In0.1O3−δ composition exhibited ability to recover the same crystal structure after reduction. For 1mm thick membranes, a high oxygen permeation flux of about 1.48mLcm−2min−1 was measured at 900°C under air/He gradient conditions.
•In-doping enhances the structural stability of BaCo0.7Fe0.3−xInxO3−δ membranes.•In-doping increases the nonstoichiometry δ but decreases ∆δ upon temperature.•In-doping causes the increase in oxygen ion migration activation energy (Ea).•DFT calculation was used to understand the oxygen ion migration behavior.•BaCo0.7Fe0.2In0.1O3−δ exhibits high oxygen permeability.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Bacterial nanotubes are tubular membranous structures bulging from the cell surface that can connect neighboring bacteria for the exchange of intercellular substances. However, little is known about ...the formation and function of bacterial nanotubes under the stress of antimicrobial materials. Herein, an imidazolium-type cationic poly(ionic liquid) (PIL) and corresponding PIL membranes with antimicrobial properties were synthesized. The effects of these cationic polymers on the formation of bacterial nanotubes between
Escherichia coli
(
E. coli
) and
Staphylococcus aureus
(
S. aureus
) or
Vibrio fischeri
(
V. fischeri
), followed by intraspecies and interspecies exchange of antibiotic resistance genes (ARGs) were investigated. The results showed that bacteria tend to produce more nanotubes accompanied by drug-resistance trade, which can even make the ARGs of pathogens spread to the environmental microbes of
V. fischeri
. Given the unique antimicrobial sustainability toward bacteria after they acquire ARGs
via
bacterial nanotubes, antimicrobial PILs demonstrate bright prospects in the battle against resistant bacteria.
Antimicrobial poly(ionic liquid) membranes are explored for stress effects on the formation of bacterial nanotubes along with the exchange of antibiotic resistance genes among intra/inter-species bacteria.
A porous PrBaCo2O5+δ or Ce0.8Sm0.2O2−δ–50 vol.% PrBaCo2O5+δ (SDC–PBCO (5/5)) layer was deposited on dense Ce0.8Sm0.2O2−δ–40 vol.% PrBaCo2O5+δ (SDC–PBCO (6/4)) membrane (450 μm) to enhance the oxygen ...permeability by increasing the surface area contacting with air. The oxygen permeation flux was measured in the temperature range of 825–945 °C. The results revealed that the oxygen permeation performance of Ce0.8Sm0.2O2−δ–PrBaCo2O5+δ membranes can be significantly enhanced by coating SDC–PBCO (5/5) porous layer alone on the surface of feed side. The thickness of modification layer has obvious effect on the permeability of surface modified membrane. The modification on the feed side has much better effect than that on the permeate side. At 945 °C, the oxygen permeation flux of dense SDC–PBCO (6/4) membrane modified by porous SDC–PBCO (5/5) layer is 3.56 × 10−7 mol cm−2 s−1, 26% higher than that of the unmodified one.
► SDC–PBCO porous layer can enhance the oxygen permeability of SDC–PBCO membrane. ► The modification on the feed side has better effect than that on both sides. ► SDC–PBCO layer exhibits better modification performance than pure PBCO layer. ► The thickness of modification layer has significant impact on the permeability.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Highlights • Long-term ALA supplement can ameliorate age-related cognitive impairment. • Long-term ALA supplement decreases AD-like pathology during natural aging. • ALA plays neuroprotection via ...suppressing the PERK/eIF2α branch of UPR signaling.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
ZnS/C nanoparticles with core/shell structure are prepared by a simple solvothermal process followed by an annealing process. The core consists of a quite amount of ultrasmall ZnS nanocrystals (~10 ...nm) dispersing in in situ formed carbon matrix, which is covered by an outer carbon shell with ~ 4 nm thickness. The nano-sized ZnS crystals effectively shorten the lithium ion diffusion paths, while the uniform carbon shell, together with the inner amorphous carbon matrix not only provide fast electron conduction, but also act as a buffer matrix to accommodate volume change occurring on electrochemical cycling. Such hierarchical-type microstructure is beneficial concerning electrochemical performance of the proposed composite. When evaluated as an anode material for rechargeable lithium ion batteries, the ZnS/C nanocomposite shows a high specific capacity of 741 mAh g-1 at a current density of 0.1 A g-1 after 300 cycles. Even at 5 A g-1, a high reversible capacity of 538 mAh g-1 can be still achieved. The lithium diffusion coefficient of ZnS/C electrode is estimated as 6.1 x 10-11 cm2 s-1, contributing to the excellent rate performance of the material.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
