Influence of the Geometry on the LTCC Integrated Electrochemical Cells Performance

Miniaturized and integrated analytical devices, including chemical sensors, are at the forefront of modern analytical chemistry. The construction of novel analytical tools takes advantage of contemporary micro- and nanotechnologies, as well as materials science and technology. The goal of this study was investigate electron transfer resistance in model solution and protein adsorption using integrated electrochemical cell with different geometry.

An Ultrasonication-Assisted Cobalt Hydroxide Composite with Enhanced Electrocatalytic Activity toward Oxygen Evolution Reaction

A catalyst toward oxygen evolution reaction (OER) was synthesized by depositing cobalt hydroxide on carbon black. Ultrasonication was applied during precipitation to improve the performance of the catalyst. The ultrasonic-assisted process resulted in the refinement of the cobalt hydroxide particles from 400 nm to 50 nm, and the thorough incorporation of these particles with carbon black substrate. The resulting product exhibited enhanced OER catalytic activity with an onset potential of 1.54 V (vs. reversible hydrogen electrode), a Tafel slope of 18.18 mV/dec, and a stable OER potential at a current density of 10 mA cm−2, because of the reduced resistance of the catalyst and the electron transfer resistance.

Ultratrace detection of toxic heavy metal ions found in water bodies using hydroxyapatite supported nanocrystalline ZSM-5 modified electrodes

Hydroxyapatite nanoparticles, intercrystalline mesopores of Ag-Nano-ZSM-5, and lower electron transfer resistance of the material are responsible for high electro-catalytic activity.

Homogeneous precipitation synthesis and electrochemical performance of LiFePO4/CNTs/C composites as advanced cathode materials for lithium ion batteries

LiFePO4/CNTs/C composite cathode materials were synthesized by a simple homogeneous precipitation and subsequent annealing process. The resulting composite material exhibits smaller particle size, lower electron-transfer resistance, and faster lithium ion migration.

Nitroxide radical polymer/carbon-nanotube-array electrodes with improved C-rate performance in organic radical batteries

The intimate connection between carbon nanotubes and the current collector reduces electron-transfer resistance of the cathode and enhances the C-rate performance of the batteries.

An Immunosensor for Pathogenic Staphylococcus aureus Based on Antibody Modified Aminophenyl-Au Electrode

The objective of this work is to elaborate an immunosensing system which will detect and quantify Staphylococcus aureus bacteria. A gold electrode was modified by electrografting of 4-nitrophenyl diazonium, in situ synthesized in acidic aqueous solution. The immunosensor was fabricated by immobilizing affinity-purified polyclonal anti S. aureus antibodies on the modified gold electrode. Cyclic voltammetry (CV) and Faradaic Electrochemical Impedance Spectroscopy (EIS) were employed to characterize the stepwise assembly of the immunosensor. The performance of the developed immunosensor was evaluated by monitoring the electron-transfer resistance detected using Faradaic EIS. The experimental results indicated a linear relationship between the relative variation of the electron transfer resistance and the logarithmic value of S. aureus concentration, with a slope of 0.40 ± 0.08 per decade of concentration. A low quantification limit of 10±2 CFU per ml and a linear range up to 107±2×106 CFU per mL were obtained. The developed immunosensors showed high selectivity to Escherichia coli and Staphylococcus saprophyticus.

High-Temperature Performance of Amorphous Nickel Hydroxide Coated with La(OH)3

La(OH)3coated amorphous nickel hydroxide was prepared by chemical coprecipitation method. The microstructure, surface morphology and chemical composition of the prepared sample were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). Electrochemical performances of the sample were characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge/discharge measurements. The results demonstrated that the coating of La(OH)3 dramatically decreased electron transfer resistance and increased oxygen evolution potential of amorphous nickel hydroxide. Moreover, the high-temperature performance of amorphous nickel hydroxide was significantly improved after the coating of La(OH)3.