In this work, N2 adsorption was employed to investigate the effects of carbon support, platinum, and ionomer loading on microstructure polymer electrolyte membrane fuel cell catalyst layers (CLs). Brunauer−Emmett−Teller t-plot analyses isotherms pore-size distributions were used study supports, platinum/carbon powders, three-component platinum/carbon/ionomer CLs. Two types supports chosen for investigation: Ketjen Black Vulcan XC-72. CLs with a range Nafion loadings studied in order evaluate...

Ordered WO3 nanowire arrays on carbon cloth (WNCC) conductive substrates are successfully prepared by a facile hydrothermal method. The as-prepared samples were characterized XRD, SEM and TEM directly functionalized as supercapacitor (SC) lithium-ion battery (LIB) electrodes without using any ancillary materials such black or binder. unique structural features endow them with excellent electrochemical performance. SCs demonstrate high specific capacitance of 521 F g−1 at 1 A 5.21 cm−2 10...

The effects of carbon microstructure and ionomer loading on water vapor sorption retention in catalyst layers (CLs) PEM fuel cells are investigated using dynamic sorption. Catalyst based Ketjen Black Vulcan XC-72 blacks, which possess distinctly different surface areas, pore volumes, microporosities, studied. It is found that pores <20 nm diameter facilitate uptake by capillary condensation the intermediate range relative humidities. A broad size distribution (PSD) to enhance Black-based CLs...

A self-powered electrochromic smart window with tunable transmittance driven by dye-sensitized solar cells has been designed, which also acts as a photocharged supercapacitor high areal capacitance and reversible color changes.

Gas diffusion electrodes (GDEs) containing a graded distribution of Nafion were prepared and characterized, their performance as fuel cell cathodes compared to GDEs possessing uniform Nafion. Cyclic voltammetry, electrochemical impedance spectroscopy (EIS), porosimetry are used characterize the variations in properties, ionic conductivity, microstructures. The cathodic was improved over at intermediate high levels polarization when content GDE higher toward catalyst layer/membrane interface...

By using thermal-evaporation-grown single crystalline ZnS nanowires as the active materials, several kinds of high performance sensors, including gas thermistors, and ultraviolet (UV) light were fabricated. nanowire-based sensors show sensitivity, fast response recovery times, selectivity, can be used to detect acetone ethanol down 500 ppb level. The thermal index (B) device is about 3100 K, indicating it suitable for fabricating thermistors. good stability, toward UV imply that (NWs) are...

Self-assembly of one-dimensional nanoscale building blocks into functional 2-D or 3-D complex superstructures has stimulated a great deal interest. We report the synthesis and characterization nanopolyhedrons assembled from ultrathin SnO2 nanowires based on sodium dodecyl sulfate (SDS)-assisted hydrothermal process. As-synthesized have uniform diameters around 300 nm are self-assembled by numerous with 5–10 nm. The growth mechanism was also studied investigating samples synthesized at...

By using a facile and template-free polyol refluxing process, we reported the successful synthesis of porous SnS SnS2 architectures on large scale. The as-synthesized samples were characterized by XRD, SEM, TEM, UV-vis DRS, Raman N2 adsorption–desorption analyses. Studies revealed that products mainly consist flower-like microstructures with reasonable BET surface areas 66 m2 g−1 33 g−1, respectively. Photocatalytic properties trace amounts investigated photodegradation MB RhB under visible...

As an important part of urban development, forest parks (UFPs) are critical community resources for supporting physical activity people all ages, and also crucial connecting to nature, specifically mental health benefits. During the COVID-19 pandemic, have experienced exponential increases in volume users as sought ways enjoy green spaces their benefits safely. park environment provides a pleasant, healthy comfortable atmosphere UFPs vital impact on human health, which has been recognized by...

Abstract Solid‐state lithium batteries are considered promising energy storage devices due to their superior safety and higher density than conventional liquid electrolyte‐based batteries. Lithium aluminum germanium phosphate (LAGP), with excellent stability in air good ionic conductivity, has gained tremendous attention over the past decades. However, poor interface compatibility Li anode, slow Li‐ion conduction thick pellets, high‐temperature sintering procedure limit further development...

The effect of Nafion loading on the electrode polarization characteristics a proton exchange membrane fuel cell is studied with macrohomogeneous model. composition dependence performance rationalized by first relating mass fractions different components to their volume and thereafter involving concepts percolation theory parameterize effective properties cathode catalyst layers. In particular, we explore systematically content performance. For uniform layer, best obtained about 35 wt %,...

We report the synthesis of hierarchically branched semiconducting SnO2 nanowire on metallic Sb-doped nanowires by sequential seeding multiple generations with Au nanoparticles as catalysts. Such nanowire/metallic backbone complex structures increase potential functionality nanowires. Branched films are used sensing materials for high-performance ethanol sensor fabrication. The sensors show sub-ppm sensitivity and fast response recovery times at 300°C. A linear equation relationship between...

Zn-doped SnO2 nanorods have been prepared by a simple hydrothermal method on large scale. The as-prepared samples were characterized x-ray powder diffraction, scanning electron microscope, transmission energy dispersive spectrometer, photoelectron spectroscopy, UV–vis absorption spectra and photoluminescence spectra. Studies found that the products are needle-like single-crystalline grown along [] orientation. photocatalytic properties of synthesized investigated decomposing acid fuchsine,...

Ferromagnetic γ-Fe2O3 nanoparticles were successfully loaded into multi-walled carbon nanotubes (MWNTs) as probed by transmission electron microscopy. Upon incorporation of the γ-Fe2O3-MWNTs poly(p-phenylenebenzobisoxazole) (PBO), a conjugated polymer with high mechanical strength and outstanding thermal oxidative stability, microwave absorbing materials obtained. Attributed to special structure γ-Fe2O3-MWNTs, synergistic effects on dielectric loss magnetic loss, better matched...

Abstract Zn 3 As 2 is an important p‐type semiconductor with the merit of high effective mobility. The synthesis single‐crystalline nanowires (NWs) via a simple chemical vapor deposition method reported. High‐performance single NW field‐effect transistors (FETs) on rigid SiO /Si substrates and visible‐light photodetectors flexible are fabricated studied. As‐fabricated single‐NW FETs exhibit typical transistor characteristics features mobility (305.5 cm V −1 s ) I / off ratio (10 5 )....

By using electrochemical activated FTO glass as both a substrate and catalyst, we developed facile fast method to fabricate WO3·2H2O thin film with thickness of ∼100 nm. Due the specific layered crystal structure dihydrated phase good contact transparent conductive oxides (TCOs) layer, as-prepared achieved coloration/bleaching response speed (tc,90% = 3.2 s, tb,90% 1.2 s), excellent cyclic stability, wide optical modulation range up 53.8% high coloration efficiency 107.8 cm2 C−1. A...

We reported the fabrication of a highly flexible, sensitive, and excellent reproducible photo-detector based on flexible nanoparticle-assembled ZnO cloth, which was synthesized via carbon cloth templated hydrothermal method. The conductance device increased more than 600 times after UV irradiation. response time decay were found to be around 3.2 s 2.8 s, respectively, indicating fast photoresponse characteristics for photodetector. Besides, free-standing can easily thrown into wastewater...

Layered Ni-rich lithium transition metal oxides are promising cathode materials for high-energy-density lithium-ion batteries. These cathodes, however, suffer from rapid performance decay under high-voltage operation. In this work, the electrochemical properties and structural evolution of LiNi0.8 Mn0.1 Co0.1 O2 (NMC811) upon cycling investigated. The results show that NMC811 not only experiences surface with formation Li-deficient rock-salt layers, but also suffers drastic intragranular...