Lithium-ion capacitors(LICs) were fabricated using mesocarbon microbeads(MCMB) as a negative electrode and a mixture of activated carbon(AC) and LiFePO4 as a positive electrode(abbreviated as LAC).The phase structure ...
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Lithium-ion capacitors(LICs) were fabricated using mesocarbon microbeads(MCMB) as a negative electrode and a mixture of activated carbon(AC) and LiFePO4 as a positive electrode(abbreviated as LAC).The phase structure and morphology of LAC samples were characterized by X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM).The electrochemical performance of the LICs was studied using cyclic voltammetry,charge-discharge rate measurements,and cycle performance testing.A LIC with 30 wt% LiFePO4 was found to have the best electrochemical performance with a specific energy density of 69.02 W h kg-1 remaining at 4 C rate after 100 *** with an AC-only positive electrode system,the ratio of practical capacity to theoretical calculated capacity of the LICs was enhanced from 42.22% to 56.59%.It was proved that adding LiFePO4 to AC electrodes not only increased the capacity of the positive electrode,but also improved the electrochemical performances of the whole LICs via Li+ pre-doping.
The research on using thiol-ene click reaction to synthesize sulfur-containing polymers with topological structures and advancedfunctional properties is a hot topic. However, the application of the thiol-yne reaction...
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The research on using thiol-ene click reaction to synthesize sulfur-containing polymers with topological structures and advancedfunctional properties is a hot topic. However, the application of the thiol-yne reaction in the functional polymer preparation is limited and the thiol-yne click polymerization is to be further developed. In this review, we summarized recent research efforts on using thiol-yne click polymerization to synthesize polymers with topological structures. The sulfur-containing polymers were facilely prepared by photo-and thermo-initiated, amine-mediated, and transition-metal-catalyzed thiol-yne click polymerizations. These polymers are promising to be used as drug-delivery vehicles, high refractive index optical materials, photovoltaic materials, and biomaterials etc.
According to the movement law of yarn carriers in the four-step braiding technique and the fixed grid method, a script file that calculates the space shape and location data of 3D braided rectangle preform is develope...
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Porous yttria-stabilized zirconia (YSZ) ceramics with various pore structures were fabricated by various TBA-based gelcasting methods, including traditional gelcasting, gelcasting with pore-forming agent, gelcasting w...
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An optical device,consisting of a multi-mode Fabry–Pérot laser diode(MMFP-LD)with two-stage optical feedback,is proposed and experimentally *** results show that the single-mode output with side-mode suppression...
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An optical device,consisting of a multi-mode Fabry–Pérot laser diode(MMFP-LD)with two-stage optical feedback,is proposed and experimentally *** results show that the single-mode output with side-mode suppression ratio(SMSR)of~21.7 dB is attained by using the first-stage *** using the second-stage feedback,the SMSR of single-mode operation could be increased to~28.5 dB while injection feedback power of-29 dBm is introduced into the laser *** the case of up to-29 dBm feedback power,the outcome SMSR is rapidly decayed to a very low level so that an obvious multi-mode operation in the output spectrum could be achieved at the feedback power level of-15.5 ***,a transition between single-and multi-mode operations could be flexibly controlled by adjusting the injected power in the second-stage feedback ***,in the case of injection locking,the outcome SMSR and output power at the locked wavelength are as high as~50 dB and~5.8 dBm,respectively.
Topological insulators （Tls） are bulk insulators that possess robust helical conducting states along their interfaces with conventional insulators. A tremendous research effort has recently been devoted to TI-based ...
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Topological insulators （Tls） are bulk insulators that possess robust helical conducting states along their interfaces with conventional insulators. A tremendous research effort has recently been devoted to TI-based heterostructures, in which con- ventional proximity effects give rise to a series of exotic physical phenomena. This paper reviews our recent studies on the potential existence of topological proximity effects at the interface between a topological insulator and a normal insu- lator or other topologically trivial systems. Using first-principles approaches, we have realized the tunability of the vertical location of the topological helical state via intriguing dual-proximity effects. To further elucidate the control parameters of this effect, we have used the graphene-based heterostructures as prototypical systems to reveal a more complete phase diagram. On the application side of the topological helical states, we have presented a catalysis example, where the topo- logical helical state plays an essential role in facilitating surface reactions by serving as an effective electron bath, These discoveries lay the foundation for accurate manipulation of the real space properties of the topological helical state in TI- based heterostructures and pave the way for realization of the salient functionality of topological insulators in future device applications.
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