A STUDY OF ELECTRODES AND ELECTRODE REACTIONS: II. THE RELATION OF THE ENERGY NECESSARY TO REMOVE AN OXYGEN MOLECULE FROM CHARGED NICKEL OXIDE ELECTRODES IN VACUA AND SOLUTIONS OF POTASSIUM HYDROXIDE.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J ELECTRONIC COMPONENTS LAB
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The energies that are necessary to remove oxygen from charged nickel oxide electrodes that are in solutions of potassium hydroxide at 25C were calculated. The 21 and 24 kilo calories that are necessary to release one mole of oxygen into potassium hydroxide solutions agree with the 21 and 24 kilo calories that are necessary to release it into vacua. The evolution of oxygen from charged nickel oxide electrodes into vacua obeys the equation describing first-order reactions, and seems to result from the simple decomposition of the higher oxides of nickel. The evolution of oxygen obeys the same equation with the same specific reaction rates when the electrodes are in solutions of potassium hydroxide that are saturated with oxygen. Therefore, it was concluded that the reduction of the higher oxides of nickel results from a simple decomposition in both, that the rate of reoxidation of the lower oxides of nickel is negligible, and that the energy of activation for this reoxidation is large relative to kT. The variation of the electromotive force is calculated as a function of the variation of the ratio of the concentrations of the oxidized and reduced nickel ions that are on the surface of the electrodes. Author
- Physical Chemistry
- Electrochemical Energy Storage