scholarly journals Mitigation of Hydrogen Gas Generation from the Reaction of Uranium Metal with Water in K Basin Sludge and Sludge Waste Forms

2011 ◽  
Author(s):  
Sergey I. Sinkov ◽  
Calvin H. Delegard ◽  
Andrew J. Schmidt
Keyword(s):  
Hydrogen Gas ◽  
Gas Generation ◽  
Uranium Metal ◽  
Waste Forms ◽  
Sludge Waste

scholarly journals Gas Generation Testing of Uranium Metal in Simulated K Basins Sludge and Grouted Sludge Waste Forms

2004 ◽  
Author(s):  
Calvin H Delegard ◽  
Andrew J Schmidt ◽  
Rachel L Sell ◽  
Sergei I Sinkov ◽  
Samuel A Bryan
Keyword(s):  
Gas Generation ◽  
Uranium Metal ◽  
Waste Forms ◽  
Sludge Waste

scholarly journals Final Report - Gas Generation Testing of Uranium Metal in Simulated K Basin Sludge and in Grouted Sludge Waste Forms

2004 ◽  
Author(s):  
Calvin H Delegard ◽  
Andrew J Schmidt ◽  
Rachel L Sell ◽  
Sergei I Sinkov ◽  
Samuel A Bryan ◽  
...  
Keyword(s):  
Final Report ◽  
Gas Generation ◽  
Uranium Metal ◽  
Waste Forms ◽  
Sludge Waste

Generation Mechanism of Hydrogen Gas from Hardened Cement Paste by γ-Irradiation

1994 ◽  
Vol 353 ◽  
Author(s):  
K. Noshita ◽  
T. Nishi ◽  
M. Matsuda
Keyword(s):  
Hydrogen Generation ◽  
Hydrogen Gas ◽  
Generation Rate ◽  
Hardened Cement ◽  
Gas Generation ◽  
Γ Irradiation ◽  
Waste Forms ◽  
Two Factors ◽  
G Value ◽  
Hydrogen Radicals

AbstractHydrogen gas is generated from cementitious waste forms by radiolysis of water. In the case of low level radioactive waste, gas yields have been confirmed to be sufficiently low by irradiation experiments. However, studies have suggested that the hydrogen generation rate in cementitious waste forms is larger than the rate calculated from the g-value (H2 yields for 100eV absorbed). In this paper, the factors that increase the gas generation were investigated quantitatively. Two factors were identified, the effect of an organic diethylene glycol which reacts with hydrogen radicals to produce hydrogen, and the effect of electrons generated in the cementitious matrix which decompose water to hydrogen. The hydrogen generation rate was confirmed to drop less than the rate calculated from the g-value when these factors were eliminated.

Dissolution of uranium metal without hydride formation or hydrogen gas generation

2008 ◽  
Vol 378 (3) ◽  
pp. 299-304 ◽  
Author(s):  
Chuck Soderquist ◽  
Bruce McNamara ◽  
Brian Oliver
Keyword(s):  
Hydrogen Gas ◽  
Gas Generation ◽  
Uranium Metal ◽  
Hydride Formation

LiNO3 Addition to Cement Which Prevents Aluminum Corrosion

1997 ◽  
Vol 506 ◽  
Author(s):  
T. Matsuo ◽  
T. Izumida ◽  
M. Hironaga ◽  
Y. Horikawa ◽  
T. Shiomi
Keyword(s):  
Underground Water ◽  
Hydrogen Gas ◽  
Disposal Site ◽  
Chemical Analyses ◽  
Metallic Aluminum ◽  
Gas Generation ◽  
Water Penetration ◽  
Waste Forms ◽  
Aluminum Corrosion ◽  
Land Disposal

ABSTRACTLiNO3 addition to cement was examined to prevent hydrogen gas generation from metallic aluminum in dry active wastes during waste solidification and under circumstances of underground water penetration into the land disposal site. And its reaction mechanism was identified by some chemical analyses. The volume of the hydrogen gas generation with LiNO3 addition was 10% as much as that without LiNO3, by formation of the insoluble Li-Al preservation film on aluminum. After the land disposal of waste forms, LiNO3 would be expected to be effective to prevent aluminum corrosion as long as the cement forms keep their alkaline character, and when it became ineffective, the circumstances around the waste forms can be made less corrosive for aluminum. The aluminum corrosion at that time would be as much as 10% of that without LiNO3 addition.

scholarly journals Mitigation of Hydrogen Gas Generation from the Reaction of Water with Uranium Metal in K Basins Sludge

2010 ◽  
Author(s):  
Sergey I. Sinkov ◽  
Calvin H. Delegard ◽  
Andrew J. Schmidt
Keyword(s):  
Hydrogen Gas ◽  
Gas Generation ◽  
Uranium Metal

scholarly journals Thickness-dependent photoelectrochemical properties of a semitransparent Co3O4 photocathode

2018 ◽  
Vol 9 ◽  
pp. 2432-2442 ◽  
Author(s):  
Malkeshkumar Patel ◽  
Joondong Kim
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Hydrogen Generation ◽  
Hydrogen Gas ◽  
Generation Rate ◽  
Alkaline Electrolyte ◽  
Stoichiometric Ratio ◽  
Gas Generation ◽  
Pec Cells ◽  
Gas Generation Rate

Co3O4 has been widely studied as a catalyst when coupled with a photoactive material during hydrogen production using water splitting. Here, we demonstrate a photoactive spinel Co3O4 electrode grown by the Kirkendall diffusion thermal oxidation of Co nanoparticles. The thickness-dependent structural, physical, optical, and electrical properties of Co3O4 samples are comprehensively studied. Our analysis shows that two bandgaps of 1.5 eV and 2.1 eV coexist with p-type conductivity in porous and semitransparent Co3O4 samples, which exhibit light-induced photocurrent in photoelectrochemical cells (PEC) containing the alkaline electrolyte. The thickness-dependent properties of Co3O4 related to its use as a working electrode in PEC cells are extensively studied and show potential for the application in water oxidation and reduction processes. To demonstrate the stability, an alkaline cell was composed for the water splitting system by using two Co3O4 photoelectrodes. The oxygen gas generation rate was obtained to be 7.17 mL·h−1 cm−1. Meanwhile, hydrogen gas generation rate was almost twice of 14.35 mL·h−1·cm−1 indicating the stoichiometric ratio of 1:2. We propose that a semitransparent Co3O4 photoactive electrode is a prospective candidate for use in PEC cells via heterojunctions for hydrogen generation.

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