Crystal structure and ionic conductivity of solid electrolytes M5RESi4O12, where M=Na,Ag, RE=Sm→Lu

Conductivity measurements of the crystals of the N₅RESi₄O₁₂ family, where RE=Sm→Lu, have been made. A reversible phase transition R32

R$\text{3}$c has been established. The conductive channels have been determined using a high temperature X-ray structural analysis of the Na₅RESi₄O₁₂ crystals, as well as the ion exchanged Ag phase.     

Effect of humidity on the conductivity of graphite oxide during its photoreduction

The influence of humidity on the conductivity of graphite oxide (GO) films has been considered. Graphite oxide films of a 200–500 nm thickness become conductors to have a conductivity of 10^?6 to 10^?2 S/cm when humidity increases from 30 to 100%. Film morphology varies during the course of water diffusion. Ultraviolet light-mediated reduction of GO decreases the sensitivity to humidity until its complete disappearance.     

Proton conductivity of calix[4]arene-para-sulfonic acids

The proton conductivity of hydrates of calix[4]arene-para-sulfonic acids is studied. The high proton conductivity is observed at ambient temperatures in the wide ranges of environmental humidity and, correspondingly, water content in the hydrate. For the air humidity of 10 rel. %, the conductivity of compounds is 10^?4-10^?3 S cm^?1 and approaches 10^?2-10^?1 S cm^?1 as the humidity increases up to 70 rel. %.     

Electrochemical sensors based on platinized Ti1 − x Ru x O2

Electrocatalysts based on platinized titania modified with ruthenia (0–9 mol %) were studied. The synthesized materials were investigated as working electrodes in potentiometric sensors sensitive to hydrogen and carbon monoxide. All electrocatalysts showed reproducible behavior at pure gas concentrations from 400 to 4000 ppm. In CO-H₂ mixtures with comparable concentrations of both gases, the sensors were selective toward hydrogen at ≥0.05 mol % Ru, but not selective to hydrogen or CO at less than 0.05 mol % Ru in the substrate.     

Median Chebyshev spectroscopy of electrochemical noise

Journal of Solid State Electrochemistry - An algorithm for analyzing electrochemical noise based on Chebyshev spectroscopy using the sample median is presented. Chebyshev spectroscopy with the...     

Detrending and Other Features of Data Processing in the Measurements of Electrochemical Noise

Russian Journal of Electrochemistry - Measurements of electrochemical noise in solid-state electrochemical cells with a heteropolycompound- based electrolyte are carried out. The noise power...     

Materials for bipolar plates for proton-conducting membrane fuel cells

The review is devoted to the present state of research and development in the field of construction materials for bipolar plates for hydrogen-air fuel cells with polymeric proton-conducting membranes. Principal requirements for such materials are considered and criteria for their selection are formulated.     

Measurement of electrochemical noise of a Li/MnO2 primary lithium battery

Journal of Solid State Electrochemistry - Electrochemical noise of a Li/MnO2 primary lithium battery was measured and analyzed during discharge process for the first time. The amplitude of the...