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A Self-Bleaching Electrochromic Mirror Based on Metal Organic Frameworks
No full textMetal-organic frameworks (MOFs) are considered to be the most promising positive anode materials to store charge for electrochromic devices. Nevertheless, a detailed mechanism of the electrochemical and ions storage process has not yet been revealed. Herein, the electrochemical mechanism of the highly porous ZIF-67 films and the electrochromic performance of electrochromic mirrors constructed from ZIF-67 and WO3 electrodes were investigated. The mechanism of the charge storage was revealed in the kinetic analysis of the Li-ion behavior based on the cyclic voltammetry curves and electrochemical impedance spectra. Impressively, the electrochromic mirrors with the self-bleaching effect and self-discharge behavior showed a unique electrochromic performance, such as a high coloration efficiency of 16.47 cm(2) C-1 and a maximum reflectance modulation of 30.10% at 650 nm. This work provides a fundamental understanding of MOFs for applications in electrochromic devices and can also promote the exploration of novel electrode materials for high-performance reflective electrochromic devices
The corrosion resistance mechanisms of the cr-coated SiC in molten Na2SO4 salt: Strengthened boundaries and protective scales
No full textThe corrosion resistance of pressureless-sintered silicon carbide (SiC) plates in the molten Na2SO4 salt was greatly enhanced by their surfaces coated with magnetron-sputtered chromium (Cr) coatings. The Cr-coated SiC plates remained good structural integrity in the 1000 degrees C molten Na2SO4 salt for >20 h, in contrast to the uncoated ones that completely crushed into pieces after 4 h. The corrosion-resistance mechanisms mainly depend on the strengthened boundaries by formation of the Cr-C and Cr-Si compounds to avoid the preferred corrosion of boundaries, and the barrier effect of the Cr2O3/Cr/Cr-Si-C protective scale
Ultra-thin free-standing sulfide solid electrolyte film for cell-level high all-solid-state lithium batteries
No full textAll-solid-state lithium batteries with high safety and high energy density are one of the most promising next generation energy storage devices. However, the enhancement of energy density of all-solid-state lithium batteries is generally hindered by the thick and heavy solid electrolyte layer. In this work, a 5 nm thick homogeneous polydopamine layer is coated on the Li6PS5Cl electrolyte particles in organic alkali solution, resulting in a modified adhesive particle surface. Free-standing polydopamine-coated Li6PS5Cl thin film with thickness of 35 mu m could be achieved by cold pressing. All-solid-state lithium battery with the polydopamine-coated Li6PS5Cl thin film is assembled and exhibits a discharge capacity of 485.1 mAh g(-1) after 100 cycles with a capacity retention of 78.5% at 0.1 C and 25 degrees C. A high full-cell level energy density of 284.4 Wh kg(-1) can be realized with reduced thickness and weight of electrolyte layer
Pressureless sintering and properties of (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics: The effect of pyrolytic carbon
No full textA novel (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramic was successfully prepared by pressureless sintering at 2200 ?C. With increasing content of resin-derived-carbon, the density, and mechanical and thermal properties increased up to a maximum content of 2-4 wt% resin addition, after which further addition was detrimental. All specimens showed high strength (?347?36 MPa), with the highest value achieving 450?64 MPa, and fracture toughness significantly higher (>20 %) than those of the corresponding monocarbides and Ta0.5Hf0.5C, (Ta1/ 3Zr1/3Nb1/3)C. The thermal conductivity was approximately equivalent to the lowest value of the corresponding mono-carbides, which was assumed to be due to the lattice distortion effect
Solution-processed amorphous p-type Cu-Sn-I thin films for transparent Cu-Sn-I/IGZO p-n junctions
No full textP-type Cu-Sn-I thin films with different Sn contents (C-Sn) were fabricated in air via a simple and low-cost spin-coating method. Sn additive facilitates the amorphization of CuI, and a complete amorphous phase of Cu-Sn-I film is achieved at C-Sn =15%. With increasing C-Sn, the optical bandgap increases and refractive index decreases, probably due to the influence of Sn-additive on both the electronic structure and phase state of the films. The air-processed Sn-free CuI films show p-type conduction with hole mobility and a concentration of 17.3cm(2)/V-1 s(-1) and 1.1x10(19)cm(-3), and an increasing trend of resistivity is observed along with a large drop in hole concentration during the Sn-inspired amorphization process. Moreover, transparent Cu-Sn-I/IGZO p-n junctions were constructed, exhibiting the optimum rectifying characteristic at C-Sn=15% with a forward-to-reverse ratio of 6.2x10(3)
Orientation of Ultrathin alpha-ZrP Nanosheets in Aqueous Epoxy Resin for Anticorrosive Coatings
No full textTwo-dimensional layered materials have attracted wide attention owing to their many desirable properties. In particular, its outstanding barrier properties can effectively improve the impermeability of organic polymer coatings. However, the barrier properties of the coating depend to a large extent on the dispersion and orientation of the nanosheets in the coating. Here, monoamine-capped poly(etheramine) is inserted into the synthesized alpha-zirconium phosphate (alpha-ZrP) to obtain water-dispersible nanosheets with regular shapes and controllable thicknesses. In addition, the effects of the orientation (random and parallel) of alpha-ZrP nanosheets on the permeability and corrosion resistance of waterborne epoxy coatings have been systematically studied, and the results are in good agreement with the theoretical model. Compared with the pure coating, the impedance of the coating with high aspect ratio nanosheets and the coating with high aspect ratio nanosheets arranged in parallel increased by 83.5 and 221.7 times, respectively, after immersion for 60 days. This provides a strategy and theoretical basis for the two-dimensional nanosheet to improve the long-term service of anticorrosion coatings
Effect of Ca2+-Si4+ on Y3Al5O12:Ce ceramic phosphors for white laser-diodes lighting
No full textY2.985-xCe0.015CaxAl5-xSixO12 (YAG:1.5%Ce+xCS) ceramic phosphors (CPs) were synthesized by a vacuum sintering method. The addition of CaCO3 and SiO2 significantly reduces the sintering temperature of CPs. The effects of Ca2+ - Si4+ on luminescent properties and microstructures of YAG:Ce CPs are discussed. The Ca2+ - Si4+ cannot be completely dissolved in the YAG:Ce CPs when x reaches to 0.2. Combining the results of XRD, photoluminescence, and cathodoluminescence spectra proved the existence of the Ca2Al2SiO7. The performances of the titled CPs in high-power white laser diodes lighting are characterized
Hybrid oxide brain-inspired neuromorphic devices for hardware implementation of artificial intelligence
No full textThe state-of-the-art artificial intelligence technologies mainly rely on deep learning algorithms based on conventional computers with classical von Neumann computing architectures, where the memory and processing units are separated resulting in an enormous amount of energy and time consumed in the data transfer process. Inspired by the human brain acting like an ultra-highly efficient biological computer, neuromorphic computing is proposed as a technology for hardware implementation of artificial intelligence. Artificial synapses are the main component of a neuromorphic computing architecture. Memristors are considered to be a relatively ideal candidate for artificial synapse applications due to their high scalability and low power consumption. Oxides are most widely used in memristors due to the ease of fabrication and high compatibility with complementary metal-oxide-semiconductor processes. However, oxide memristors suffer from unsatisfactory stability and reliability. Oxide-based hybrid structures can effectively improve the device stability and reliability, therefore providing a promising prospect for the application of oxide memristors to neuromorphic computing. This work reviews the recent advances in the development of hybrid oxide memristive synapses. The discussion is organized according to the blending schemes as well as the working mechanisms of hybrid oxide memristors
Targeted perfusion adsorption for hyperphosphatemia using mixed matrix microspheres (MMMs) encapsulated NH2-MIL-101(Fe)
No full textHyperphosphatemia, a common complication of chronic renal failure patients, is described as an excess amount of serum phosphate >4.5 mg dL(-1). Current therapy for hyperphosphatemia is limited by low removal efficiency, secondary hyperparathyroidism, uremic bone disease, and the promotion of vascular and visceral calcifications. Metal organic frameworks (MOFs) have aroused great interest in the field of blood purification because of their strong specific adsorption. Herein, we prepared mixed matrix microspheres (MMMs) encapsulated NH2-MIL-101(Fe) with specific adsorption to blood phosphate. Simultaneously, a heparinoid copolymer poly (acrylic acid-sodium 4-vinylbenzenssulfonate) (P(AA-SSNa)) was incorporated to improve the hemocompatibility. The proposed MMMs exhibited excellent phosphate adsorption capacity both in aqueous and human plasma environments. They also showed comprehensive hemocompatibility e.g. low tendency of protein adsorption, low hemolysis rate and extended blood coagulation time. In general, we envision that the MMMs are potentially suitable as highly efficient hemoperfusion adsorbents for hyperphosphatemia treatment
Interspecies interactions of Vibrio azureus and Jeotgalibacillus alkaliphilus on corrosion of duplex stainless steel
No full textInvestigations of multispecies biofilms and the relationships among these species are crucial for understanding the microbiologically influenced corrosion of metal alloys in actual environments. This study investigated the corrosion of 2205 duplex stainless steel by pure cultures of marine Vibrio azureus and Jeotgalibacillus alkaliphilus and their mixture using different electrochemical and surface analysis techniques. The results showed a significant enhancement of the growth rate and an increase in the biomass population of the biofilm in the presence of both bacteria. Microbial community analysis revealed a harsh competition between the two species. V. azureus benefitted from the competition between the two strains, grew faster, and dominated in the biofilm. Electrochemical results showed an increase in both the anodic dissolution and cathodic oxygen reduction rates of the duplex stainless steel in artificial seawater containing the bacterial mixture. The electrochemical behavior was similar in the presence the bacterial mixture and V. azureus alone, confirming that this bacterium acted as a dominant competitor. AFM images showed larger pits with irregular shapes in the presence of both bacteria, indicating faster pitting propagation