This communication reports on hydrogen evolution reaction (HER), studied at Ni foam and Pd-activated nickel materials in 0.1-M NaOH solution over the temperature range of 20–60 °C. Catalytic modification leads to significant facilitation temperature-dependent HER kinetics, manifested through radically reduced values charge-transfer resistance parameter, as well substantially modified Tafel polarization curves. The presence a catalytic additive (Pd) is evidenced scanning electron microscopy...

Composition and hygienic quality of milk determine its nutritional value processing suitability. However, biological depends on the content bioactive components, which due to health promoting properties have a positive effect human health. Biologically active substances present in cow's include proteins, peptides, amino acids, sugars, vitamins, enzymes, sterols, phospholipids fatty acids. Among these several proteins (lactoferrin, β-lactoglobulin, bovine serum albumin casein) that inhibit...

This paper reports on the process of industrial-type wastewater purification carried-out through continuous anodic dissolution aluminum alloy sacrificial anode for artificially aerated Cu-Al galvanic (macro-corrosion) cells and synthetically prepared solutions. Electrochemical experiments were performed by means a laboratory size electrolyzer unit, where electrocoagulation along with surface-induced electrooxidation phenomena examined containing Acid Mixture Disperse Red 167 dyes. Final...

Recent years have witnessed a growing interest in the nutritional value and health benefits of food products animal origin. Numerous research studies been undertaken to evaluate effects bovine milk, key dietary component, on human health. Fat is one most important components its content ranges from 2.8% 8.1%, subject breed cattle, aspects, individual characteristics, lactation period, milk production hygiene season. The aim this study was review latest literature concerning found fat. This...

The present paper reports an electrochemical study of hydrogen evolution reaction (HER), at commercially available (Toho-Tenax) nickel-coated carbon fibre (NiCCF) material, in 30 wt.% KOH solution. Kinetics the NiCCF were studied for prolonged time, over temperature range 22-60 oC, where kinetic parameters derived by means a.c. impedance spectroscopy cathodic overpotential range: -100 to -500 mV/RHE. effects cathode deactivation (the result reversible formation nickel hydride species) upon...

The oxygen evolution reaction (OER) and the hydrogen (HER) are critical processes in water splitting, yet achieving efficient performance with minimal overpotential remains a significant challenge. Although NiFe-based catalysts widely studied, their can be further enhanced by optimizing interaction between catalyst substrate. Here, we present detailed investigation of NiFe-modified graphite electrodes, comparing effects compressed expanded substrates on catalytic performance. Our study...

The present paper reports an ac impedance study of the hydrogen evolution reaction (HER) at nickel-coated carbon fiber (NiCCF) materials. HER was examined in 0.5 M and 0.1 NaOH solutions for selected NiCCF composites (and comparatively Ni wires) that were produced by electro (or electroless) deposition a thin layer (ca. ) onto 12,000-filament tow material. kinetics NiCCFs studied room temperature over cathodic overpotential range −100 to −500 mV per reversible electrode. corresponding values...

This article primarily presents cyclic voltammetry, Tafel polarization and ac. impedance spectroscopy electrochemical examinations of resorcinol (RC) electro-reactivity on the Pt(111) surface its influence kinetics UPD H (underpotentially deposited hydrogen) HER (hydrogen evolution reaction) in a 0.1 M NaOH supporting solution. The collected data provided evidence RC-ion’s adsorption further electroreduction presence surface-adsorbed radicals along with their primary beneficial role process....

Nickel-metal hydride (NiMH) batteries are still major battery systems that commercially used for hybrid electric vehicle (HEV) applications. This is because they characterized by long durability, safe operation and significantly lower manufacturing cost, as compared to lithium-ion devices, their competitor these However, electrochemical performance of NiMH strongly dependent on the temperature exposed to. Thus, at temperatures below ca. -20 oC, capacity nickel-metal declines (as recorded...

This paper reports on cathodic evolution of hydrogen, examined at Pt-modified nickel foam material. Hydrogen reaction (HER) was studied in 0.1 M NaOH solution platinum-activated catalyst material, obtained via a spontaneous deposition method. Catalytic Pt modification resulted substantial enhancement the HER kinetics, as compared to those recently recorded Pd/Ru-modified Ni materials. Electrochemical investigations were carried out by means AC impedance spectroscopy and quasi-potentiostatic...

The present study reports cyclic voltammetric and a.c. impedance spectroscopy investigations of electrooxidation reaction ethanol on Pt catalytic surfaces, performed in 0.1 M NaOH supporting electrolyte. kinetics C2H5OH oxidation were specifically examined polycrystalline Pt, Pt(111) (100) single-crystal with special consideration underpotential deposition (UPD) H at Pt. In order to temperature dependence reaction, electrochemical examinations for electrode over the range: 23-60 °C.

Screening tests play a significant role in rapid and reliable assessment of normal individual development the entire population children adolescents. Body posture screening carried out at schools reveal that 50-60% adolescents demonstrate body abnormalities, with 10% this group risk for progressive spinal deformities. This necessitates search effective economically feasible forms diagnosis. The aim study was to assess reliability clinical evaluation compared objective Zebris CMS-10 system...

Electrochemical oxygen evolution reaction (OER) activity was studied on nickel foam-based electrodes. The OER investigated in 0.1 M NaOH solution at room temperature as-received and Co- or Mo-modified Ni foam anodes. Corresponding values of charge-transfer resistance, exchange current-density for the other electrochemical parameters examined composites were recorded. electrodeposition Co Mo base-materials resulted a significant enhancement electrocatalytic activity. quality extent Co,...

Present study covers a.c. impedance investigations of hydrogen evolution reaction (HER), carried-out on carbon fibre (CF) and Ru-modified CF tow materials. The HER was examined in 0.5 M H2SO4 solution for surface-activated electrochemically deposited Ru Hexcel 12K Kinetics the were studied at room temperature, over cathodic overpotential range: -100 to -800 mV vs. RHE. Corresponding values charge-transfer resistance, exchange current-density other electrochemical parameters catalyst...

This paper presents an innovative, electrochemical impedance method for monitoring of behaviour a multi-cell, direct methanol fuel cell (DMFC) device. not only provides classical voltage changes at successive cells but also allows their detailed to be presented. Impedance characteristics individual within stack (depending on actual operating conditions) are obtained via numerous tasks, including simultaneous determination each cell's impedances, performance optimization the and effective...

Nickel-coated carbon fiber material is of interest to a number important industry sectors. The present paper reports complex study the corrosion performance 12K (12,000 single filaments) composite tows. behavior this was examined in dilute , -based neutral and solutions, with respect its potential application electrochemical cathodic protection bipolar plate (fuel cell) technologies. composites were produced by electro- (or electroless ) deposition an ultrathin (ca. Ni coating onto Hexcel...

Electrocoagulation makes an alternative method to chemical coagulation. This paper presents the results obtained during electrocoagulation of model wastewater using aluminum electrodes. The was treated by means chronopotentiometric process in a static system, at constant current I = 0.3 A; therefore higher doses electrocoagulant required longer time. Changes zeta potential, pH, turbidity, oxygen demand (COD), suspended solids and total phosphorus concentrations were determined. A new for...

The present paper reports on ethanol oxidation reaction (EOR) investigated at catalytically modified nickel foam material. EOR was studied in 0.1 M NaOH supporting electrolyte Pd-activated catalyst material, obtained by a spontaneous deposition method. Catalytic modification of Ni resulted composite material having superior kinetics, as elucidated through corresponding values a.c. impedance-derived charge-transfer resistance parameter (including temperature-dependence the over temperature...