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Chemical reactions do not occur and the physical structure of the electrodes is not affected. Since mass transport does not occur, charge and discharge of a capacitor are extremely fast, and a nearly unlimited number of charge/discharge cycles is possible. But the amount of stored energy per weight or volume is comparatively small. In batteries such a double layer also exists, and the large surface area of the active material gives rise to a high double layer capacitance when impedance measurements are made.

5 mV and the resulting heat generation would be DU ? i ¼ R ? i2 ¼ 4:5mW, which is represented only as a line at the bottom of the left column in Fig. 10. 07 W/A. Most of the energy that is employed for water decomposition escapes from the cell as energy content of the generated gases. This energy consists of the two components: 1. 23 V. Copyright © 2003 by Expert Verlag. All Rights Reserved. 2. 3), and a corresponding increase of the energy content of the gas. Both shares are proportional to the amount of decomposed water, which again is only determined by the current i as the product Ucal ?

Copyright © 2003 by Expert Verlag. All Rights Reserved. 2 Transference numbers in sulfuric acid and potassium hydroxide at room temperature. For diluted solutions of sulfuric acid given in Ref. 10, but also true for concentrations used in batteries. For potassium hydroxide true for a wide concentration range given in Ref. 11. Sulfuric acid Potassium hydroxide tþ ¼ tHþ ¼ 0:9 tÀ ¼ tHSO4 ¼ 0:1 tþ ¼ tKþ ¼ 0:22 tÀ ¼ tOH ¼ 0:78 The transference number indicates how much the concentration of the concerned ion is changed by migration due to the current flow.

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