Oxygen recombination

Cell Assembly. The methods for cell assembly, starting with the processed plaques depend on whether the cells are to be vented or sealed. For vented cells, processed plaques are usually compressed to 85 —90% of their processed thickness allowing sufficient porosity for electrolyte retention and strengthening the plate stmcture. For sealed cells, sizing of the negative plaques is usually avoided because maximum surface area is important to oxygen recombination. 

Some efforts toward sealed battery development (76) were made. However, a third electrode, an oxygen recombination electrode was required to reduce the cost of the system. High rate appHcations such as torpedo propulsion were investigated (77) and moderate success achieved using experimental nickel—zinc ceUs yielding energy densities of 35 W-h/kg at discharge rates of 8 C. A commercial nickel—zinc battery is considered to be the most likely... 

When the combustion cycle takes place, the components, hydrogen and oxygen, recombine to once again form water molecules. Thus only water and extra air exit the exhaust pipe. Next, being that this water is in a highly excited state, very hot steam, it exits as something similar to very moist air. Ever driven your car in the rain Doesn t kill or rust it does it And there you have a car that runs on water. Just needs the right modifications performed. 

Prototype sealed button cells and larger prismatic cells have been fabricated and studied. As with the nickel-cadmium and nickel-metal hydride systems, an oxygen recombination route is necessary, but the use of membrane separators limits oxygen transport to the negative plate and... 

Two lypes of batteries having immobilized electrolyte systems are also made. They are most common in consumer applications, but their use in industrial and SLI applications is increasing. Both types have low maintenance requirements and usually can be operated in any position. They arc sometimes called valve regulated or recombinant batteries because they are equipped with a one-way pressure relief vent and normally operate in a sealed condition with an oxygen recombination cycle to reduce water loss. 

Similar reactions can be writteu for other metallic additives. At the negative electrode two more reactions can occur, hydrogen evolution and oxygen recombination. 

The commonly proposed mechanism for the reaction is that hydrogen and oxygen recombine on the catalyst surface to yield a peroxy intermediate, which subsequently reacts with propene to yield PO and water.21... 

Wetting characteristics can be improved by maximizing the surface area through the use of densely packed fibres of small diameter — but at a higher cost and with the likelihood of a decrease in the efficiency of oxygen recombination. The fibre blend and subsequent treatment influence the resulting pore size and associated properties such as tensile strength and compressibility. In addition, some manufacturers use... 

Fig. 9.2. Model depicting mixed-potential condition at negative-plate surface due to simultaneous functioning of hydrogen-evolution zones and oxygen-recombination gas paths.

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