Institutional Repository of Ningbo Institute of Material Technology & Engineering, CAS
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The Composition and Magnetic Property of Co/Cu Alloy Microwires Prepared Using Meniscus-Confined Electrodeposition: Effect of [Co2+], [Cu2+] Concentration at the Tip of the Meniscus
No full textMeniscus-confined electrodeposition (MCED) is an effective and versatile technique for fabrication of alloy structures with precise localization and high controllability. Here, the fabrication of cobalt-copper (Co/Cu) alloy microwires using MCED techniques is reported. Co/Cu microwires with a wide range of compositions (Co9Cu91 to Co100Cu0) and controllable morphology were printed using the co-electrodeposition mode from a single electrolyte. We utilized multiphysics finite element simulation to investigate the influence of electrolyte evaporation and electric field on the concentration distribution of metal ions in the meniscus. The concentration of ions at the substrate interface increases linearly with decreasing humidity and increasing current density, which can be used to fine turn the alloy composition. By further analyzing the alloy composition, we found that the electrodeposition of Cu is diffusion controlled, while Co is mainly electrochemical reaction controlled, as a results of combined action of surface evaporation and reaction dynamics in the meniscus. The prepared alloy wires are polycrystalline, dense and uniform composition distribution. The coercivity and magnetic anisotropy are enhanced by increasing of the copper content in the alloy wires. The high tunability of composition make this alloy a promising material for magnetic micro/nano-electromechanical devices
Optical management of spacer layer of high-performance four-terminal perovskite/silicon tandem solar cells
No full textPerovskite/silicon tandem solar cell (TSC) is a promising strategy to receive high power conversion efficiency (PCE), exceeding the Shockley-Queisser (S-Q) limit of single junction SC. However, the reflected light still dominates the loss of photocurrent, happened at the surface and interface of two sub cells. Here, a suitable spacer layer is accepted to manage the light harvesting in the four-terminal (4T) pemvskite/silicon TSC. The influence of microstructure, refractive index and thickness of spacer layer on the photocurrent has been systematically studied by the photoelectric simulation. And then the designed spacer layer is a double-side textured structure with a refractive index (RI) of 1.4 in 4 mu m thickness, receiving the best light-harvesting to being the largest photocurrent. Furthermore, the relationship of light-absorption between perovskite and silicon SCs is investigated as a function of bandgap and thickness of perovskite, yielding the optimal photocurrent of 21.65 mA/cm(2) and 19.71 mA/cm(2) for top and bottom cells, respectively. Finally, four types of industrialized silicon SCs are integrated into the TSCs to study the photoelectric performance in detail, predicting the theoretical limitation PCE of 33.52%. Therefore, this simulated study provides a theoretical guide for the optical design of high-efficiency 4T TSCs
Silk fibroin-Ti3C2TX hybrid nanofiller enhance corrosion protection for waterborne epoxy coatings under deep sea environment
No full textThe complex and harsh deep sea environment is the main reason for the failure of the protective coating of marine equipment. However, excellent protective coating is the key to prolong the service life of the equipment under deep sea environment. Ti3C2Tx, with high aspect ratio, abundant surface functional groups and excellent mechanical properties, is the suitable candidate nanofiller for coating reinforcement. Herein, we synthesized a novel silk fibroin-Ti3C2Tx (SF-Ti3C2Tx) hybrid nanofiller as reinforced-additives for improving the anti-corrosion ability of waterborne epoxy coating. Due to the rough surface of SF-Ti3C2Tx nanosheets, they have excellent compatibility with the resin matrix and could fill the inherent defects of the coating. The anticorrosion behaviors of as-prepared composite coatings under both of atmospheric pressure and simulated deep sea environment were investigated in detail. Particularly, the composite coating with 0.5 wt% SF-Ti3C2Tx sheets showed outstanding corrosion protection (impedance value remained 1.31 x 108 omega.cm2, four orders of magnitude higher than pure EP) after 240 h immersion under 20 MPa hydrostatic pressure. In addition, the interface of coating/steel was not damaged and the coating remained the favorable adhesion strength (3.16 MPa, but that of pure EP only 0.88 MPa) even in the harsh high hydrostatic pressure. Based on the experiment data, we discussed and analyzed the failure process of coatings and explained the corrosion protection mechanism of SF-Ti3C2Tx hybrid under simulated deep sea environment
In Situ Formed Li-Ag Alloy Interface Enables Li10GeP2S12-Based All-Solid-State Lithium Batteries
No full textAll-solid-state lithium-metal batteries (ASSLMBs) have received great interest due to their high potential to display both high energy density and safety performance. However, the poor compatibility at the Li/solid electrolyte (SE) interface and penetration of lithium dendrites during cycling strongly impede their successful commercialization. Herein, a thin Ag layer was introduced between Li and Li10GeP2S12 for the in situ formation of a Li-Ag alloy interface, thus tuning the interfacial chemistry and lithium deposition/dissolution behavior. Superior electrochemical properties and improved interfacial stability were achieved by optimizing the Ag thicknesses. The assembled symmetric cell with Li@Ag 1 mu m showed a steady voltage evolution up to 1000 h with an areal capacity of 1 mAh cm(-2). Moreover, a high reversible capacity of 106.5 mAh g(-1) was achieved in an all-solid-state cell after 100 cycles, demonstrating the validity of the Ag layer. This work highlights the importance of the Li/SE interface re-engineering and provides a new strategy for improving the cycle life of ASSLMBs
Performance of CO2 electrolysis using solid oxide electrolysis cell with Ni-YSZ as fuel electrode under different fuel atmospheres
No full textHigh efficiency conversion of CO2 can be realized in a solid oxide electrolysis cell. In this work, a flat-tube cell with symmetrical structure supported by Ni-YSZ fuel electrode was used to study the performance of high-temperature CO2 electrolysis under different reducing gas components in the fuel electrode. The results indicated that in the H-2-CO2 fuel electrode atmosphere, the instantaneous performance of CO2 electrolysis is better, the polarization impedance is smaller, and the overpotential of CO2 electrolysis is lower under the same partial pressure of oxygen (i.e., with the same open-circuit voltage). Compared with CO as the protective gas, it is easier to achieve a stable electrolytic voltage for the electrolysis of CO2 under H-2 protection. In the H-2-CO2 reaction atmosphere, when the proportion of protective H-2 increased from 25% to 75%, devastating irreversible degradation occurs at -300 mA/cm(2), while in the CO-CO2 (71.7% CO-28.3% CO2) reaction atmosphere, the similar degradation occurs at - 200 mA/cm(2). At - 200 mA/cm(2) constant-current electrolysis, the highest energy conversion efficiency can reach 171% (disregarding energy consumption for heating the gas) and 81.6% (disregarding energy consumption for heating air). This work provides a useful reference for the selection of atmosphere protection in CO2 electrolysis based on Ni-YSZ electrode SOEC
Effect of A-site atom on static corrosion behavior and irradiation damage of Ti2SC phases
No full textMAX phases are a large family of damage-tolerant structural materials for the nuclear energy industry. The anti-corrosive property to the tritium fluoride (TF) produced by the neutron irradiation of FLiBe is an issue for the MAX phases applied to the molten salt reactors (MSRs). Herein, the Ti2SC phase was used for the first time to evaluate the corrosion resistance to the concentrated hydrofluoric acid as the simulated service condition. The comprehensive characterizations including weight-loss curves, X-ray diffraction, field emission scanning electron microscopy, and energy dispersive spectroscopy were employed to analyze the corrosion behavior and mechanism of Ti2SC in comparison with Ti3AlC2 and Ti3SiC2. The good intrinsic anti-corrosive property of Ti2SC was originated from the strong Ti-S bond. Considering the acceptable preliminary performance at low displacement per atom (dpa), the Ti2SC probably has a potential to be used as the structural material in the MSRs
Humidity-Assisted Chlorination with Solid Protection Strategy for Efficient Air-Fabricated Inverted CsPbI3 Perovskite Solar Cells
No full textHumidity-assisted chlorination with solid protection via 1,2-bis(chlorodimethylsilyl)ethane (Si-Cl) incorporation is demonstrated as an effective strategy to address water erosion for efficient air-fabricated inverted CsPbI3 perovskite solar cells (PSCs). Si-Cl molecules can rapidly react with water to reduce moisture erosion during deposition in air. In addition, the hydrolysis production of hydrogen chloride (HCl) can chlorinate CsPbI3 while the spontaneous polymerization of 1,2-bis(hydroxydimethylsilyl)ethane (Si-OH) builds a solid protection, which would improve the crystallization and phase stability of CsPbI3. Therefore, a champion efficiency of 18.93% with high open-circuit voltage of 1.176 V is achieved, which is the highest efficiency among the inverted inorganic PSCs. Furthermore, the moisture tolerance of both the CsPbI3 films and air-fabricated PSCs gets significant improvement. In addition, the nonencapsulated device shows good operational stability without efficiency drop after 1 sun illumination at 65 degrees C for 900 h
An intelligent tumor microenvironment responsive nanotheranostic agent for T1/T2 dual-modal magnetic resonance imaging-guided and self-augmented photothermal therapy
No full textPhotothermal therapy (PTT), as a promising antineoplastic therapeutic strategy, has been harnessed to restrain tumor growth through near-infrared (NIR) irradiation mediated thermal ablation. Nevertheless, its biological applications are hampered by thermal diffusion and up-regulated heat shock proteins (HSPs). Herein, a versatile nanotheranostic agent is developed via integrating Zn0.2Fe2.8O4 nanoparticles (NPs), polydopamine (PDA), and MnO2 NPs for T1/T2 dual-modal magnetic resonance (MR) imaging-guided and self-augmented PTT. The as-designed Zn0.2Fe2.8O4@PDA@MnO2 NPs adequately serve as a PTT agent to realize effective photothermal conversion and obtain local hyperthermia. Additionally, the Zn0.2Fe2.8O4@PDA@MnO2 NPs can significantly consume overexpressed glutathione (GSH) and generate Mn2+ in the tumor microenvironment (TME), thus destroying redox homeostasis and catalytically generating hydroxyl radicals (OH) for HSP suppression and PTT enhancement. Meanwhile, Mn2+ and Zn0.2Fe2.8O4 NPs significantly strengthen T1- and T2-weighted MR contrast for tumor imaging and PTT guidance. Hence, this study offers proof of concept for self-augmented PTT and T1/T2 dual-modal MR imaging for tumor elimination
Intrinsically Elastic Organic Semiconductors (IEOSs)
No full textElastic semiconductors are becoming more and more important to the development of flexible wearable electronic devices, which can be prepared by structural engineering design, blending, and the intrinsic elastification of organic semiconductors (intrinsically elastic organic semiconductor, IEOS). Compared with the elastic semiconductors prepared by structural engineering and blending, the IEOS prepared by organic synthesis has attracted numerous attentions for its solution processability and highly tunable chemical structures. For IEOSs, reasonable designs of synthetic routes and methods are the basis for realizing good mechanical and electrical properties. This brief review begins with a concise introduction of elastic semiconductors, then follows with several synthetic methods of IEOSs, and concludes the characteristics of each method, which provides guidance for the synthesis of IEOSs in the future. Furthermore, the properties of IEOSs are involved from the aspects of electrical, mechanical properties, and the applications of the IEOSs in elastic electronic devices. Finally, the challenge and an outlook which IEOSs are facing are presented in conclusion.</p