Development of oil-dissolved hydrogen gas detector for diagnosis of transformers

1990 ◽  
Vol 5 (1) ◽  
pp. 226-232 ◽  
Author(s):  
Y. Inoue ◽  
K. Suganuma ◽  
M. Kamba ◽  
M. Kikkawa
Keyword(s):  
Hydrogen Gas ◽  
Gas Detector ◽  
Dissolved Hydrogen

Kinetics of Hydrogen Absorption, Desorption And Permeation of Metals

CORROSION ◽  
1958 ◽  
Vol 14 (12) ◽  
pp. 34-38 ◽  
Author(s):  
T. G. OWE BERG
Keyword(s):  
Experimental Data ◽  
Reaction Mechanisms ◽  
Hydrogen Absorption ◽  
Hydrogen Gas ◽  
Acid Solutions ◽  
Dilute Acid ◽  
Energy Diffusion ◽  
Dissolved Hydrogen ◽  
Kinetics Of ◽  
Absorption Of Hydrogen

Abstract The reaction mechanisms for the absorption of hydrogen by metals from moist hydrogen gas and dilute acid solutions, for the desorption from metals of dissolved hydrogen in the presence of water and for hydrogen solubility and permeation under those conditions are discussed. Their kinetics are also given. Formulae are derived for rates and equilibria. These are compared with experimental data. The migration of H atoms in the metal is concluded to be associated with zero or nearly zero activation energy. Diffusion is rapid enough to maintain almost uniform distribution of H atoms in the metal during absorption and desorption under ordinary conditions. 3.8.4

scholarly journals Concentration profile of dissolved gas during hydrogen gas evolution: an optical approach

2020 ◽  
Vol 56 (92) ◽  
pp. 14483-14486
Author(s):  
Kota Ando ◽  
Yoshiharu Uchimoto ◽  
Takashi Nakajima
Keyword(s):  
Concentration Profile ◽  
Hydrogen Gas ◽  
Optical Image ◽  
Gas Evolution ◽  
Dissolved Gas ◽  
Image Tracking ◽  
Dissolved Hydrogen

Optical image tracking of individual bubbles enables us to extract the concentration profile of dissolved hydrogen as a function of distance from the electrode.

RADIATION-INDUCED EXCHANGE OF DEUTERIUM BETWEEN HEAVY WATER AND DISSOLVED HYDROGEN

1957 ◽  
Vol 35 (1) ◽  
pp. 84-90 ◽  
Author(s):  
J. Bardwell ◽  
P. J. Dyne
Keyword(s):  
Heavy Water ◽  
Gamma Rays ◽  
Molecular Hydrogen ◽  
Room Temperature ◽  
Reaction Rate ◽  
Deuterium Oxide ◽  
Hydrogen Gas ◽  
Radiation Induced ◽  
Dissolved Hydrogen ◽  
Moderate Range

Exchange of deuterium between deuterium oxide and molecular hydrogen is induced by gamma rays from Co60. The reaction was studied by irradiating heavy water solutions saturated with hydrogen gas, and then analyzing the gas with a mass spectrometer. The reaction rate conforms to the exponential exchange law. The exchange yield is independent of dose rate and of hydrogen concentration over a moderate range. Prolonged irradiation leads to a steady state where the isotopic composition of the gas is close to that of the solution. This state differs greatly from that for thermodynamic equilibrium at room temperature.

scholarly journals Synthesis and characterization of composite polyaniline as hydrogen gas detector

2017 ◽  
Vol 13 (4) ◽  
pp. 559-562 ◽  
Author(s):  
Alister Genndi Willis ◽  
Saharudin Haron
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Oxidative Polymerization ◽  
Hydrogen Gas ◽  
Oxide Content ◽  
Composite Polymer ◽  
Best Response ◽  
Vis Spectroscopy ◽  
Gas Detector

Composite polymer consisting polyaniline (PANI) and zinc oxide (ZnO) were synthesized via oxidative polymerization of aniline. The composite PANI thin films were characterized by FTIR spectroscopy and their optical properties towards hydrogen gas were investigated using UV-vis spectroscopy. The FTIR spectra obtained verified the synthesis PANI/ZnO composite. From the experimental results, it was found that with increasing zinc oxide content in the composite cause the transmittance to decrease. The transmittance of the thin films slightly increased after exposed to hydrogen gas. PANI-ZnO (10%w.t.) exhibited best response compared to other composition with the highest transmittance peak difference of 11.4%. 

scholarly journals Performance Evaluation of Microtubular Solid Oxide Fuel Cell Prototypes at a Laboratory Scale and Identification of Needs Related to Gas Sensors

Proceedings ◽  
2017 ◽  
Vol 2 (3) ◽  
pp. 106
Author(s):  
César I. Ramos Villegas ◽  
Carlos L. Fernández Rendón ◽  
Hugo J. Avila-Paredes
Keyword(s):  
Performance Evaluation ◽  
Solid Oxide Fuel Cells ◽  
Gas Sensors ◽  
Low Cost ◽  
Hydrogen Gas ◽  
Solid Oxide ◽  
Laboratory Scale ◽  
Oxide Fuel ◽  
Present Contribution ◽  
Gas Detector

Solid Oxide Fuel Cells (SOFC’s) are devices for power generation, usually for stationary applications. Microtubular SOFC’s have been developed for portable applications. The present contribution includes a brief description of the fabrication and some results of the performance evaluation of microtubular SOFC’s (specifically for samples that are in the process of failing due to the formation of fractures in them or in the cement sealant) at a laboratory scale so that researchers who are developing sensors could improve their prototypes for this type of applications. During the evaluation, safety relies on gas sensors that detect fuel leaks. A low cost hydrogen gas detector—alarm system is also presented.

scholarly journals Synthesis of composite thin-film polymer consisting of tungsten and zinc oxide as hydrogen gas detector

2019 ◽  
Vol 90 ◽  
pp. 01008
Author(s):  
Willis Alister G. ◽  
Saharudin Haron
Keyword(s):  
Zinc Oxide ◽  
Metal Oxides ◽  
Hydrogen Gas ◽  
Composite Polymer ◽  
Transitional Metal Oxides ◽  
Pani Composite ◽  
Vis Spectroscopy ◽  
Before And After ◽  
Gas Detector ◽  
Film Polymer

A composite polymer consisting of polyaniline (PANI) was synthesised via oxidative polymerisation by varying concentrations of transitional metal oxides and the presence of a hydrogen dissociation catalyst, palladium (Pd). The metal oxides chosen for this study were tungsten oxide (WO3) and zinc oxide (ZnO). The composite polymer samples were characterised using Fourier transform infrared (FTIR) spectroscopy where ultraviolet-visible (UV-Vis) spectroscopy was used to observe the optical changes of the thin films due to exposure to hydrogen. The FTIR spectra obtained confirmed the synthesis of PANI composite. Based on the UV-VIS analysis, PANI-ZnO composite polymer showed the highest difference in peak intensity before and after exposure to hydrogen with 11.4% difference.

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