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Surface Engineered Li Metal Anode for All-Solid-State Lithium Metal Batteries with High Capacity
No full textLithium metal is being hailed as the holy grail of next-generation high-energy-density all-solid-state batteries. However, the poor interfacial compatibility between Li and solid electrolyte and formation of lithium dendrite strongly impedes its practical application. Herein, a facile surface modification strategy is proposed to reconstruct the Li/Li10GeP2S12 interface in order to address these problems. Beneficial from amorphous Li3PO4 by radio frequency magnetron sputtering on Li, parasitic side reactions between Li and Li10GeP2S12 is strongly suppressed, resulting in a stable cycling performance in symmetric Li/Li cell with a low polarization voltage (about +/- 180 mV) up to 1000 hours. Moreover, the Li/Li10GeP2S12/LiCoO2 cell displays a reversible discharge capacity of 104.5 mA h/g at 0.1 C after 50 cycles. It indicates that Li3PO4 layer is not only favorable to improve interfacial stability between Li/Li10GeP2S12 but also advantageous to homogenize Li deposition
RESEARCH ON REGIONAL RURAL TOURISM CONSTRUCTION AND DEVELOPMENT STRATEGIES BASED ON TOURISTS' PERCEIVED VALUE - TAKING THE GREATER BAY AREA AROUND HANGZHOU BAY AS AN EXAMPLE
No full textIt is an important development plan of national tourism construction in the new era to develop rural tourism towns with regional characteristics and special ethnic features and to construct a group of famous tourism towns and villages with distinctive landscape. This study took the Greater Bay Area around Hangzhou Bay as the research area and adopted the evaluation method of tourist's perceived value to study and analyze the construction and development status of seven representative rural tourist attractions in the Greater Bay Area around Hangzhou Bay from the perspectives of ecological environment, social environment, cultural environment and tourism products and services. The result of the research showed that at the present stage, the main problems of rural tourism scenic spots in the Greater Bay Area around Hangzhou. Bay included poor humanistic environment, insufficient cultural heritage of rural tourism, serious homogenization of scenic spot tourism projects and products, single tourist structure, low professional quality of scenic spot practitioners, poor service attitude, etc. In view of the existing problems, this study put forward corresponding optimization strategies from three aspects: cultural and social environment, market expansion and operation, scenic spot products and tourism services
Activating the I-0/I+ redox couple in an aqueous I-2-Zn battery to achieve a high voltage plateau
No full textRechargeable iodine conversion batteries possess promising prospects for portable energy storage with complete electron transfer and rich valence supply. However, the reaction is limited to the single I-/I-0 redox at a potential of only 0.54 V vs. the standard hydrogen electrode (SHE), leading to a low voltage plateau at 1.30 V when Zn is employed as the anode. Herein, we show how to activate the desired reversible I-0/I+ redox behavior at a potential of 0.99 V vs. SHE by electrolyte tailoring via F- and Cl- ion-containing salts. The electronegative F- and Cl- ions can stabilize the I+ during charging. In an aqueous Zn ion battery based on an optimized ZnCl2 + KCl electrolyte with abundant Cl-, the I-terminated halogenated Ti3C2I2 MXene cathode delivered two well-defined discharge plateaus at 1.65 V and 1.30 V, superior to all reported aqueous I-2-metal (Zn, Fe, Cu) counterparts. Together with the 108% capacity enhancement, the high voltage output resulted in a significant 231% energy density enhancement. Metallic Ti3C2I2 benefits the redox kinetics and confines the interior I species, leading to exceptional cyclic durability and rate capability. In situ Raman and ex situ multiple spectral characterizations clarify the efficient activation and stabilization effects of Cl- (F-) ions on reversible I-0/I+ redox. Our work is believed to provide new insight into designing advanced I-2-metal batteries based on the newly discovered I-/I-0/I+ chemistry to achieve both high voltage and enhanced capacity
Microstructure and Thermoelectric Properties of (Bi0.48Sb1.52)Te-3 Thick Films Prepared with Tape Casting Method
No full textThis paper reports the fabrication and characterization of (Bi0.48Sb1.52)Te-3 thick films using a tape casting process on glass substrates. A slurry of thermoelectric (Bi0.48Sb1.52)Te-3 was developed and cured thick films were annealed in a vacuum chamber at 500-600 degrees C. The microstructure of these films was analyzed, and the Seebeck coefficient and electric conductivity were tested. It was found that the subsequent annealing process must be carefully designed to achieve good thermoelectric properties of these samples. Conductive films were obtained after annealing and led to acceptable thermoelectric performance. While the properties of these initial materials are not at the level of bulk materials, this work demonstrates that the low-cost tape casting technology is promising for fabricating thermoelectric modules for energy conversion
Remote Tracking Gas Molecular via the Standalone-Like Nanosensor-Based Tele-Monitoring System
No full textHighlightsA standalone-like smart device that can remotely track the variation of air pollutants in a power-saving way is created;Metal-organic framework-derived hollow polyhedral ZnO was successfully synthesized, allowing the created smart device to be highly selective and to sensitively track the variation of NO2 concentration;A novel photoluminescence-enhanced Li-Fi telecommunication technique is proposed, offering the created smart device with the capability of long distance wireless communication.AbstractRemote tracking the variation of air quality in an effective way will be highly helpful to decrease the health risk of human short- and long-term exposures to air pollution. However, high power consumption and poor sensing performance remain the concerned issues, thereby limiting the scale-up in deploying air quality tracking networks. Herein, we report a standalone-like smart device that can remotely track the variation of air pollutants in a power-saving way. Brevity, the created smart device demonstrated satisfactory selectivity (against six kinds of representative exhaust gases or air pollutants), desirable response magnitude (164-100 ppm), and acceptable response/recovery rate (52.0/50.5 s), as well as linear response relationship to NO2. After aging for 2 weeks, the created device exhibited relatively stable sensing performance more than 3 months. Moreover, a photoluminescence-enhanced light fidelity (Li-Fi) telecommunication technique is proposed and the Li-Fi communication distance is significantly extended. Conclusively, our reported standalone-like smart device would sever as a powerful sensing platform to construct high-performance and low-power consumption air quality wireless sensor networks and to prevent air pollutant-induced diseases via a more effective and low-cost approach
Intergranular interaction in nanocrystalline Ce-Fe-B melt-spinning ribbons via first-order reversal curve analysis
No full textFirst-order reversal curve (FORC) diagram, which visualizes the variation of magnetic interaction on a field plane, has been applied to nanocrystalline Ce-Fe-B melt-spinning ribbons. The FORC diagram exhibits different vertical spread along the H-u axis when the applied field is parallel or perpendicular to the ribbon surface. The discrepancy of vertical spread corresponds to different intergranular interactions, which can also be verified by Henkel plot, another method to identify the interactions. The larger vertical spread on the H-u axis along the perpendicular direction is ascribed to the dominance of magnetostatic interaction, while the smaller one along the parallel direction indicates the existence of stronger exchange coupling interaction. The remanence enhancement effect along the parallel direction further confirms the existence of exchange coupling. These indicate that a FORC diagram is a powerful evaluation method for distinguishing different magnetic interactions in permanent magnets. Moreover, Lorentz transmission electron microscopy was used to analyze the magnetic domain structure of nanocrystalline Ce-Fe-B melt-spinning ribbons
Corrosion retardation effect of a green cauliflower extract on copper in H2SO4 solution: Electrochemical and theoretical explorations
No full textHigh toxicity is the main reason to limit the application of traditional corrosion inhibitors. Herein, the development of a green and high-efficiency alternative to displace traditional and hazardous corrosion inhibitor is an urgent task. Cauliflower extract (CFE) has the potential ability to solve this problem because it comes from nature and also contains plenty of heterocyclic organics. Therefore, CFE, as an eco-friendly corrosion inhibitor, was prepared for the first time via a simple and green extraction method. The typical electrochemistry and scanning vibrating electrode technology (SVET) tests prove that CFE can effectively inhibit the copper corrosion in 0.5 M H2SO4. What's more, this inhibition effect is still strong when prolonging the immersion time, and the highest inhibition efficiency reaches up to 99% at 48 h. Based on the surface composition analysis result, it can be obtained that CFE protective film is formed on the copper substrate, and thereby significantly block the active corrosion sites of copper. Furthermore, the parallel adsorption state and high E-binding value from MD simulation imply the powerful interaction between CFE molecules and Cu, which is crucial evidence to explain the inhibition effect of CFE for copper at the molecular level. (C) 2020 Elsevier B.V. All rights reserved
Insight into anti-corrosion mechanism of tetrazole derivatives for X80 steel in 0.5 M H2SO4 medium: Combined experimental and theoretical researches
No full text5-Mercapto-1-methyl tetrazole (MML), 1-12-(dimethylamino)ethyl]-1H-tetrazole-5-thiol (DET), and 1-(4hydroxyphenyl)-1H-tetrazole-5-thiol (HHT) as corrosion inhibitors were studied by electrochemical methods, surface morphology analysis, and theoretical calculations for X80 in acidic medium. Electrochemical impedance spectroscopy data indicate that the corrosion inhibition efficiency for X80 steel in 0.5 M sulfuric acid solution are all greater than 95% when the concentration of HHT, DET and MML is 10 mM at 298 K. The potentiodynamic polarization curve results indicate that HHT, DET and MML are mixed-type corrosion inhibitors. AFM and SEM results are consistent with electrochemical tests. In addition, their adsorption on the X80 steel surface is consistent with Langmuir single-layer isotherm adsorption. Quantum chemical calculations and molecular dynamics simulations are highly consistent with the experimental results. (C) 2020 Elsevier B.V. All rights reserved
Polydopamine modified ultrathin hydroxyapatite nanosheets for anti-corrosion reinforcement in polymeric coatings
No full textIt is known that two-dimensional nanosheets such as graphene, hexagonal boron nitride and layered double hydroxide can provide organic coatings with enhanced anticorrosion performance due to the high aspect ratio and excellent barrier property. As a kind of biocompatible material, the corrosion resistance of hydroxyapatite (HAp) in the biological body leads to its wide application. In this work, ultrathin HAp nanosheets were noncovalently functionalized by situ self-polymerization of dopamine chemistry with an aim to improve their compatibility and dispersibility in epoxy matrix. Electrochemical impedance spectroscopy (EIS) illustrated composited coating exhibited a higher value of impedance at low frequency compared to pure epoxy coating after 50 days of immersion in 3.5 wt% NaCl solution. Local electrochemical impedance spectroscopy (LEIS), spray tests and corrosion products characterization were also carried out to evidence that the modified HAp nanosheets could significantly improve the anti-corrosion performance of epoxy coatings via the enhanced barrier property and corrosion inhibiting effect of polydopamine, which is expected to be widely applied as nano reinforcing fillers in the anticorrosion field
Rational design of nanomedicine for photothermal-chemodynamic bimodal cancer therapy
No full textGiven the diversity, complexity, and heterogeneity of persistent tumors, traditional nanoscale monotherapeutic systems suffer from dissatisfactory curative efficiency with incidence of metastasis or relapse. In parallel, the trend of clinical research on the basis of nanomedicines has increasingly shifted from monotherapy toward combinatorial therapy for admirable synergetic performances. In this regard, cutting-edge nanomedicines harnessing photothermal-chemodynamic bimodal therapy (PTT/CDT) have opened up a highly-efficient and relatively-safe cancer theranostic paradigm. Still, the integration of PTT/CDT functional units into one nanomedicine remains a herculean but meaningful task to achieve notable super-additive effects. This review aims to elucidate underlying synergistic interactions of PTT/CDT and highlight intriguing designs of nanomedicines for PTT/CDT including nanomaterial selection, performance optimization, multimodal therapy, visualization strategies, and targeting strategies. Furthermore, an outlook on further improvements of PTT/CDT is provided, emphasizing significant scientific issues that require remediation for clinical translation. This article is categorized under: Diagnostic Tools > in vivo Nanodiagnostics and Imaging Therapeutic Approaches and Drug Discovery > Nanomedicine for Oncologic Diseas