Hydrogen-oxygen cell

Hydrogen—Oxygen Cells. The hydrogen—oxygen cell can be adapted to function as a rechargeable battery, although this system is best known as a primary one (see Fuel cells). The electrochemical reactions iavolve ... 

The hydrogen-oxygen cell used in the space shuttle is called an alkali fuel cell, because it has an alkaline electrolyte ... 

The electromotive force of an electrochemical cell is the difference in electrode potential between the two electrodes in the cell. According to the TUPAC convention, the electromotive force is the potential of the right hand electrode referred to the potential of the left hand electrode. We consider, for example, a hydrogen-oxygen cell shown in Fig. 6—4 the cell reaction is given by Eqn. 6-1 and the cell diagram is given by Eqn. 6-5 ... 

Figure 4-3 Reversible Voltage of The Hydrogen-Oxygen Cell (14)... 

The electrodes in the hydrogen-oxygen cell are porous carbon rods that contain a platinum catalyst. The electrolyte is a hot (several hundred degrees) potassium hydroxide solution. Hydrogen is oxidized at the anode where the hydrogen and hydroxide ions combine to form water. Electrons flow through the external circuit. 

A fuel cell is an electrochemical cell in which the reagents of the cell reaction are continuously supplied and the products are continuously removed. The most commonly used fuel cell is the hydrogen-oxygen cell with a NaOH electrolyte and graphite electrodes ... 

The temperature dependence of the reaction affinity is given by Eq. 4.8, and the result for the hydrogen-oxygen cell is shown in Eq. 9.28 ... 

A.2.2 The SITE and the Hydrogen-Oxygen Cell Mixed Versus Unmixed Potentials... 

Adams A M etal., 1963, The High Pressure Hydrogen Oxygen Cell, Chemical Technology Vol. 1, Academic Press, New York. 

Cells operating with hydrogen as the fuel are the simplest such devices, and serve to illustrate basic principles. Schematic diagrams of hydrogen/oxygen cells appear in Fig. 13.6. When the electrolyte is acidic [Fig. 13.6(a)], the half-cell reaction occurring at the hydrogen electrode (anode) is ... 

Measurements of the electromotive force of cells may be used conversely to determine equilibria which are not otherwise amenable to experiment. This method is very frequently employed. The thermodynamical relationship between the electromotive force and the equilibrium constant is often a very convenient means of determining equilibria which cannot be investigated directly at low temperatures owing to the slow rate at which the reactions proceed. As we have seen in the case of the hydrogen-oxygen cell, this method is only applicable when the... 

Determination of cell potential of the hydrogen-oxygen cell (fuel cell)... 

As mentioned earlier, two types of fuel cell have been developed beyond the prototype stage. These are the alkaline (KOH) electrolyte hydrogen-oxygen cell and the phosphoric acid and electrolyte hydrogen-air fuel cell. Both of these developments took place in the United States. 

Table 3.3 Performance Characteristics of a Hydrogen-Oxygen Cell with Alkaline Electrolyte at an Ambient Temperature of 70°C...

For example, the reversible voltage for a hydrogen-oxygen cell at the STP is E , = 1.229 V with water in liquid form. Considering a fuel cell with an operating cell voltage of 0.7 V, the cell voltage efficiency can be estimated as... 

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