The synthesis procedure of ZnCo₂O₄/PPy composite electrodes and the electrochemical properties electrodes.

The hydrogen circulation pump is one of the core components cycle system. To solve problem low density and possibility leakage, a vortex designed. Taking three-dimensional flow field as research object, CFD (computational fluid dynamics) numerical calculation model cavity was established, internal simulation performed to analyze performance characteristics at different speeds determine. investigate effects rates 80 L/min, 100 120 140 rotational r/min, number vanes 32, 36, 40 on circulating...

The composite supercapacitor electrodes were rationally fabricated by facile electrochemical deposition of polypyrrole (PPy) on NiCo 2 O 4 nanowire arrays which grown radially carbon fiber (CF). When used as in supercapacitors, the nanostructures demonstrated prominent performances with a high areal capacitance (1.44[Formula: see text]F/cm at current density 2[Formula: text]mA/cm ), good rate capability (80.5% when increases from to 20[Formula: and cycling ability (85% initial specific...

Abstract Dielectric and conduction properties of polyimide/silica nano‐hybrid films were investigated with the silica content testing frequency, using a small electrode system. The hybrid prepared through sol‐gel process thermal imidization, by pyromellitic dianhydride 4,4′‐oxydianiline as polyimide precursors, tetraethoxysilane methyltriethoxysilane precursors. dielectric coefficient PI/SiO 2 was monotonically increased increasing content, decreased frequency. loss had no obvious changes...

In order to meet the increasing requirements for materials in electrical and electronic industry, this paper, Si-B oxides were designed synthesized via organic monomers of Si B, Si-B/epoxy nanocomposites prepared by ultrasonic dispersion thermal curing. The dispersed uniformly epoxy resin with great compatibility average size particles was about 6 nm. Results showed that increase doping content, dielectric constant loss decreased, but effect on conductivity not obvious. strength corona...

The electric conduction current characteristics of both Dupont original and corona-resistant polyimide films (100 HN 100 CR) before after corona-aging eight hours under field 10 kV/mm 20 were measured. results show that the CR is about one order magnitude larger than HN. Based on space charge aging theory, degradation threshold obtained from limit plot 40 for 35 HN, decreases with increasing corona-aged field. By measuring depolarization two at 170°C, it observed decay faster curve, apparent...

In order to optimize the dispersion structure of filler in polymer composites, 15 nm SiO 2 (HL‐150) and 6 (HL‐380) are added epoxy (EP). The total content silica is fixed at wt%, mass ratio HL‐380 HL‐150 adjusted. /EP nanocomposites prepared by sand milling heat curing process. Transmission electron microscopy results show that mixed fillers well dispersed EP. With increase filler, relative permittivity with nano‐fillers increases, compared alone. electrical aging threshold dielectric...

Inorganic nano-composite polyimide (PI) films were prepared with the method of sol-gel. The interfacial situation and fractal characteristics PI investigated by small angle X-ray scattering (SAXS) using synchrotron radiation as source. SAXS results indicated that curves in high-angle region have a negative slope, i.e., deviation from Porod's law, which suggests there are obvious interface layers between organic phase inorganic films. thicknesses 0.54—1.48 nm. interaction becomes stronger...

In this paper we have introduced the following improvement on our previous method for auto-separating thermally stimulated current (TSC), namely, both general-order kinetic equation of a process (TSP) and real peak found by calculating activation energy varying with increment temperature are used to replace first-order point obtained from experimental TSC curve, respectively. Using separated successfully curve polyimide film, that complex is composed six sub-curves in range 250-500 K, one...

2wt%, 3wt% and 4wt% nano-Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> was loaded into silicone rubber respectively. The dispersion of particles were observed by TEM, analyzed software Image J. With the increase content, both space charge accumulation dissipation rate increase, carrier mobility decreases, trap depth increases. results show that / composite has more than matrix...

Silica nanostructure hollow spheres were synthesized using template method and the silica spheres/epoxy nanocomposite was prepared by adding modified aminophenyl trimethoxysilane (APTMOS) into epoxy resin. Dielectric properties investigated in terms of frequency filler concentration. The results showed that introduction hardly influenced thermal stability behavior. With increase content, dielectric permittivity tended to decrease firstly then increase. While dissipation factor value...

A new class of corona-resistant films made nanocluster-trapped polyimide/silica composites that were synthesized by the sol-gel reaction was obtained hydrolysis and poly-condensation tetraethoxysilane (TEOS) or methyl-triethoxysilane (MTEOS) in solution polyamic acid(PAA) dissolved N,N-dimethy-lacetamide (DMAc), followed heating. The chemical structure surface morphology characterized Atomic Force Microscope (AFM)- Fourier Transform Infrared Spectroscope (FTIR). capacity tested under high...

Hydrogen is increasingly recognized as a clean and reliable energy vector for decarbonization in the future. In marine sector, solid oxide fuel cells (SOFCs) that employ hydrogen an source have already been developed. this study, multi-channel plate-anode-loaded SOFC was taken research object. A three-dimensional steady-state computational fluid dynamics (CFD) model anode-supported established, which based on mass conservation, momentum electrochemical reactions, charge transport equations,...

The primary methods for hydrogen transportation include gaseous storage and transport, liquid storage, transport via organic carriers. Among these, pipeline offers the lowest cost greatest potential large-scale, long-distance transport. Although construction operation costs of dedicated pipelines are relatively high, blending into existing natural gas networks presents a viable alternative. This approach allows to be transported end-users, where it can either separated use or directly...

Purpose The purpose of this paper is to synthesise and characterise nano‐alumina hybrid polyimide (PI) films. Design/methodology/approach PI nano‐composite films containing definitive contents Al 2 O 3 were prepared by the sol‐gel process aluminum isopropoxide in N, N′‐dimethylacetamide solution polyamide acid. characterised Fourier transform infrared spectroscope, atomic forced microscope, X‐ray fluorescent spectroscope (XRF). thermal stability composite was tested TG. Findings nano‐Al...

To study the impact of air relative humidity on corona-resistant polyimide film properties, DuPont Kapton100CR films were put in home-made salt shakers that filled with particular saturated solution, and measurement conduction current aging carried out respectively at room temperature (296K). The result testing showed that: same condition, increase electric field. And rise, curve moved upward. At meantime, degradation threshold would decrease. test decreased logarithmically humidity.

Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanoparticles have been successfully synthesized by hydrothermal process. Subsequently, epoxy (EP) nanocomposites incorporating the fabricated. The morphologies of and were characterized scanning electron microscopy (SEM). Dielectric properties these are strongly related to both morphology filler dispersion quality. Thermogravimetric...

In order to investigate the roles of inorganic nanoparticles on improving breakdown behavior Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> /PI film, DC characteristics were studied in this paper. The morphology and element distribution zones near holes observed by SEM electron spectroscope for both original PI film nanocomposite film. experimental results showed that electrical...